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1
Olson, Hilary Clement, John W. Snedden, and Robert Cunningham. "Development and application of a robust chronostratigraphic framework in Gulf of Mexico Mesozoic exploration." Interpretation 3, no. 2 (May 1, 2015): SN39—SN58. http://dx.doi.org/10.1190/int-2014-0179.1.
Повний текст джерелаАнотація:
Renewed interest in Mesozoic exploration, onshore and offshore, in the Gulf of Mexico (GOM) has precipitated a new look at Mesozoic biostratigraphy and how these age-diagnostic bioevents can help to establish a sequence-stratigraphic framework for the basin. We have developed a new chronostratigraphic framework, primarily founded on biostratigraphic age-diagnostic data, specifically developed for Mesozoic strata of the GOM basin. Our goal was to provide a systematic and consistent framework that serves as a reference for the order and timing of depositional sequences and key surfaces in the GOM Mesozoic stratigraphic section. The new chronostratigraphic framework was based on (1) our work delineating significant physical stratigraphic surfaces from seismic and well-log data in the GOM, (2) Mesozoic biostratigraphic data from 202 onshore and offshore wells in the GOM, and (3) published literature from the GOM and other studies. The chronostratigraphic framework was formalized in an online Mesozoic biostratigraphy table and summarized in a Mesozoic stratigraphy chart. The use of the framework was key to our ability to correlate within the GOM basin, and we evaluated several examples of seismic and well-log interpretation using the new chronostratigraphic framework, including onshore-offshore correlation, identification and correlation of source rocks, and interpretation of structural anomalies. These examples illustrated how the chronostratigraphic framework enabled us to reduce uncertainty in identifying and correlating Mesozoic units from land to the deepwater GOM basin. The framework also allowed us to better compare our work with other research groups, within academia and industry, and permitted a higher level of integration of work and comments from various applied industry workers.
2
Leslie-Panek, Jennifer, Margot McMechan, and Fil Ferri. "Northeast British Columbia Liard Basin: A seismic stratigraphy study." Interpretation 8, no. 3 (June 13, 2020): T579—T588. http://dx.doi.org/10.1190/int-2019-0187.1.
Повний текст джерелаАнотація:
The Liard Basin is a highly prospective shale gas basin located in northeast British Columbia that is largely underrepresented in public literature. We used available-for-purchase 2D seismic data in the area to create a high-level, regional stratigraphic interpretation of the basin, providing the first seismically controlled overview of the basin structure and stratigraphy. The basin is characterized by two distinct, opposing wedges of sediment in the Mesozoic and Paleozoic sections: the Mesozoic with northeastward thinning and the Paleozoic with southwestward thinning. The wedging of the Upper Devonian-Lower Mississippian (Tournasian) section is dominated by multiple large packages of clinoforms, which progress into the basin from northeast to southwest and are predominantly seen in the seismic sequence stratigraphy. These distinct packages of clinoforms indicate changing sediment sources over time. In contrast, there are no clinoforms seen in the Mesozoic section, which may be a limitation of the orientation of the 2D seismic data that we used. Our result from the seismic interpretation is an updated interpretation of the Upper Devonian-Lower Mississippian stratigraphy of the Liard Basin, including an updated stratigraphic cross section for the area.
3
O’Dogherty, Luis, Patrick De Wever, Špela Goričan, Elizabeth S. Carter, and Paulian Dumitrica. "Stratigraphic ranges of Mesozoic radiolarian families." Palaeoworld 20, no. 2-3 (August 2011): 102–15. http://dx.doi.org/10.1016/j.palwor.2010.12.008.
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4
Mattner, Joerg, and Moujahed Al-Husseini. "Essay: applied cyclo-stratigraphy for the Middle East E&P industry." GeoArabia 7, no. 4 (October 1, 2002): 734–44. http://dx.doi.org/10.2113/geoarabia0704734.
Повний текст джерелаАнотація:
Summary The modeling of ordered sedimentary cycles through orbital forcing (cyclo-stratigraphy) could impact the Middle East E&P industry practices from regional exploration to reservoir engineering. The correlation of longer period cycles could detect thinning or disappearing reservoir intervals over structures. These terminations may be due to erosion or non-deposition, and used to guide exploration for stratigraphic traps. The correlation of shorter period cycles may be used to map the disappearance or diagenetic alteration of reservoir flow units between wells. The Permian and Mesozoic carbonates and evaporites that constitute the main Middle East hydrocarbon reservoirs and seals, manifest cycles at many scales, and are particularly suited for cyclo-stratigraphic analysis.
5
Wade, J. A., G. L. Williams, and B. C. MacLean. "Mesozoic and Cenozoic stratigraphy, eastern Scotian Shelf: new interpretations." Canadian Journal of Earth Sciences 32, no. 9 (September 1, 1995): 1462–73. http://dx.doi.org/10.1139/e95-118.
Повний текст джерелаАнотація:
A 320 km long, deep seismic reflection line across the central part of the Scotian Basin provides new insight on the deep stratigraphy of the basin, confirms the existence of up to 18 km of Mesozoic and Cenozoic sedimentary strata, and provides additional control on the relationship of proximal and distal stratigraphic units within the basin. Detailed biostratigraphic and seismic correlation from three outer shelf–upper slope wells yields important new information on Late Cretaceous and Tertiary unconformities and identifies a number of third-order sequence boundaries. The dating of prominent unconformities and correlation with the oceanic seismic markers AC and AU results in the reidentification of these horizons in the Sohm Abyssal Plain.
6
Zhong, Guangjian, Pibo Su, Changmao Feng, Shenghong Chen, Ming Sun, Hai Yi, Yanlin Wang, Junhui Yu, Jing Zhao, and Zhongquan Zhao. "Mesozoic hydrocarbon accumulation model in the Northern South China sea." IOP Conference Series: Earth and Environmental Science 1087, no. 1 (October 1, 2022): 012053. http://dx.doi.org/10.1088/1755-1315/1087/1/012053.
Повний текст джерелаАнотація:
Abstract The ChaoShan Depression is the largest Mesozoic depression covering an area of 3.7 x 104 km2 where the relict Mesozoic strata are up to 5000 m thick. It has experienced disruption since the late Mesozoic. In early survey, the oil-gas migration condition and reservoiring mechanism are poorly expounded from the Meso-Cenozoic tectonic superposition due to poor seismic imaging to the deep Mesozoic layers. New seismic surveys using long streamers and quasi three-dimensional layouts has improved obviously the deep images of the Mesozoic formations, enabling analysis of tectono-stratigraphic features and petroleum geology. Correlating to the regional Mesozoic stratigraphic and facies characteristics from the well LF35-1-1 and onshore outcrops, two sets of source layer tested with high organic carbon content are interpreted within the upper Triassic to mid-Jurassic semi-closed gulf sequences which become thicker toward the east side of Dongsha Island. Three sets of potential reservoir beds are also interpreted, which are a basin-floor fan sandstone layer of the Triassic-Jurassic boundary, a limestone layer atop the mid Jurassic, and a sandy layer in the Upper Jurassic. Over the low bulge of the ChaoShan Depression, a big anticline is found bounded by two sets of faults which played as migration passage for hydrocarbon from the deep Mesozoic source to the reservoir layers. Likely, one set of the fault act reverse barrier to block the petroleum escape, thus form the fault-bounded trap, favorable for future exploration.
7
Kovach, Warren L., and David J. Batten. "Worldwide stratigraphic occurrences of Mesozoic and tertiary megaspores." Palynology 13, no. 1 (December 1989): 247–77. http://dx.doi.org/10.1080/01916122.1989.9989362.
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8
Plummer, Ph S., and E. R. Belle. "Mesozoic tectono-stratigraphic evolution of the Seychelles microcontinent." Sedimentary Geology 96, no. 1-2 (April 1995): 73–91. http://dx.doi.org/10.1016/0037-0738(94)00127-g.
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Darman, Herman. "Dinoflagellate biostratigraphy of Eastern Indonesia stratigraphy: key of petroleum exploration success." Berita Sedimentologi 47, no. 3 (December 28, 2021): 75–76. http://dx.doi.org/10.51835/bsed.2021.47.3.362.
Повний текст джерелаАнотація:
Several major discoveries in the eastern part of Indonesia (e.g. Tangguh and Abadi) have increased more petroleum exploration interest in the area. These sizeable discoveries encountered gas in the Jurassic sandstone, which is a key reservoir target in the Northwest Shelf of Australia. The Mesozoic sandstone provenance is located in the Australian Continental Plate or also known as the Sahul Shelf. Thousands of wells were drilled in the Sahul Shelf and the stratigraphy in this area is well understood. The extension of the Mesozoic sandstone towards Indonesian territory, with much less well information, is one of the keys of success for petroleum exploration. Refinement of the stratigraphy of the eastern part of Indonesia is crucial to understand the extension.To refine the stratigraphy of Eastern Indonesia, especially for the Mesozoic interval, dinoflagellates play a significant role. Several types of this marine biota have been used by Australian stratigraphers as markers. In the case where stratigraphic tie to Northwest Shelf Australia discoveries, key wells or standard chronostratigraphy, dinoflagellate understanding is critical.Dinoflagellate markers are used to mark several subdivisions of Plover Sandstone. Norvick (2001) used W. indotata and D. caddaensis Maximum Flooding Surfaces to subdivide the reservoir target into upper, middle and lower Plover Formation. These surfaces are named after dinoflagellates. More markers were identified to mark the source rock and seal in the petroleum system. To have a detail correlation from Indonesia to the NW Shelf, understanding of dinoflagellates is crucial.
10
Satsangi, P. P. "Vertebrate faunas from the Indian Gondwana Sequence." Journal of Palaeosciences 36 (December 31, 1987): 245–53. http://dx.doi.org/10.54991/jop.1987.1584.
Повний текст джерелаАнотація:
In the thick pile of continental sediments of the Gondwana Sequence of India, the vertebrate-bearing horizons occur at nine stratigraphic levels; three of these are in the Palaeozoic and six in the Mesozoic. A vertebrate sequence covering the period from Upper Permian to Lower Jurassic is now known from the Indian Gondwana Formations. A brief review of the vertebrate faunas with their stratigraphic and palaeogeographic significance has been presented.
11
Konstantinova, Larisa N., Igor A. Gubin, Sergey A. Moiseev, Andrey M. Fomin, and Elena N. Kuznetsova. "CORRELATION RESULTS OF THE PROTEROZOIC-PHANEROZOIC SECTIONS OF THE ALDAN-MAYA OIL AND GAS BEARING REGION ON DEEP DRILLING DATA." Interexpo GEO-Siberia 2, no. 1 (May 21, 2021): 102–10. http://dx.doi.org/10.33764/2618-981x-2021-2-1-102-110.
Повний текст джерелаАнотація:
The article discusses the controversial issues of well log correlation of the Riphean, Vendian, Cambrian and Mesozoic sequences, which is prospects for oil and gas within the Aldan-Maya petroleum region. The author's version of the stratigraphic correlation is based on the interpretation of logging data, seismic surveys, core description, archival and published materials. The results obtained can be used for stratigraphic picks correction and structural maps plotting.
12
Kosmacheva, A. Yu, and M. O. Fedorovich. "Structural description and tectonic development history of the mesozoic deposits in the Vilyui hemisyneclise." Russian Journal of Geophysical Technologies, no. 1 (November 23, 2021): 4–18. http://dx.doi.org/10.18303/2619-1563-2021-1-4.
Повний текст джерелаАнотація:
We present the interpretation of 2D seismic data in the Vilyui hemisyneclise located in the Republic of Sakha (Yakutia). The model identifies structural and tectonic features and tectonic development history of the Mesozoic deposits in the Vilyui hemisyneclise. Structure contour maps for the reflecting horizons of the Mesozoic are qualitatively the same. Traced faults attenuate at various stratigraphic levels. The structures of the hemisyneclise are known to be formed during the Cretaceous stage of development.
13
Carr, I. D. "A SEQUENCE STRATIGRAPHIC SYNTHESIS OF THE NORTH AFRICAN MESOZOIC." Journal of Petroleum Geology 26, no. 2 (April 2003): 133–52. http://dx.doi.org/10.1111/j.1747-5457.2003.tb00022.x.
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Kowallis, B. J. "Applications of using fission tracks in Mesozoic stratigraphic studies." International Journal of Radiation Applications and Instrumentation. Part D. Nuclear Tracks and Radiation Measurements 17, no. 3 (January 1990): 436. http://dx.doi.org/10.1016/1359-0189(90)90123-f.
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15
Le Roy, P., F. Guillocheau, A. Piqué, and A. M. Morabet. "Subsidence of the Atlantic Moroccan margin during the Mesozoic." Canadian Journal of Earth Sciences 35, no. 4 (April 1, 1998): 476–93. http://dx.doi.org/10.1139/e97-111.
Повний текст джерелаАнотація:
This paper presents a combined study based on seismic interpretation, sequence stratigraphy, and the evaluation of subsidence that aims to characterize the structure and development of the Essaouira Basin in Morocco. Located in the coastal Meseta adjoining the continental margin, this basin records an initial Carnian-Hettangian deformation phase during rifting in the central part of the North Atlantic region. The geometry of the basin as a function of time shows a succession of half-grabens and horsts that developed westwards from reactivated Hercynian structures. The postrift stage is characterized by an aggrading sedimentary sequence, as shown by concordant seismic sequences stacking over the onshore part of the basin. The Upper Cretaceous coincides with a sequence showing a transition towards a prograding regime that leads to the topography of the present-day margin. Using the high-resolution analysis provided by sequence stratigraphy, it is possible to recognize fine-scale stratigraphic variations in the sedimentary succession. The well-to-well correlation of sedimentary cycles forms a dataset for evaluating subsidence. Residual subsidence curves reveal a differential behaviour between the present onshore and offshore areas. Although the computed subsidence rates are low across the onshore zone, curves for the western offshore part of the basin follow theoretical lithospheric cooling curves that are compatible with a stretch factor ( beta ) of nearly 1.4. Steep temporary gradients on the computed curves may be correlated with tectonic phases documented across the North Atlantic region that exerted a tight control on the development of the Essaouira Basin from Triassic rifting until the uplift of the Atlas Mountains during the Cenozoic.
16
Ivanik, M., D. Pyatkova, L. Plotnikova, N. Zhabina, O. Shevchuk, O. Veklych, and O. Anikeeva. "MODERNIZATION OF THE STRATIGRAPHIC SCHEMES OF MESOZOIC DEPOSITS IN UKRAINE." Tectonics and Stratigraphy, no. 41 (November 18, 2014): 75–89. http://dx.doi.org/10.30836/igs.0375-7773.2014.94648.
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17
Palechek, T. N. "Distribution and Stratigraphic Potential of the Mesozoic Radiolarian Family Prunobrachidae." Stratigraphy and Geological Correlation 26, no. 4 (July 2018): 459–73. http://dx.doi.org/10.1134/s0869593818040068.
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Shczepetov, S. V., and A. B. Herman. "On the non-marine stratigraphy and floras of north-eastern Russia." Стратиграфия 27, no. 3 (April 22, 2019): 40–52. http://dx.doi.org/10.31857/s0869-592x27340-52.
Повний текст джерелаАнотація:
Some decisions of the Third Inter-departmental Regional Stratigraphic Meeting on Precambrian, Paleozoic and Mesozoic of North-eastern Russia (St. Petersburg, 2002) are analysed in the light of latest data obtained. It is shown that regional stratigraphic units (‘Horizons’) of non-marine Cretaceous recognised in this Meeting are in fact not the basic subdivisions, but rather specialised biostratigraphic units, namely ‘Beds with flora’. Ages of some of these units are specified, notably Beds with Arman Flora is Turonian–Coniacian, Beds with Amka Flora is Coniacian and Beds with Arkagala Flora is Santonian–Campanian. We recommend to keep the previous names for the Penzhina, Barykov and Koryak phases of floral development and for the corresponding stratigraphic units. An updated version of the non-marine Cretaceous stratigraphic chart of the Okhotsk-Chukotka structural-facial Region is proposed to discuss.
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Burnham, Robyn J. "Paleoecological Approaches to Analyzing Stratigraphic Sequences." Paleontological Society Special Publications 3 (1988): 105–25. http://dx.doi.org/10.1017/s2475262200004901.
Повний текст джерелаАнотація:
Stratigraphic successions provide basic data on past changes in the biosphere. The fossil record may reflect climatic, evolutionary or ecosystem alterations. Careful analysis of Mesozoic and Cenozoic stratigraphic sequences has provided a clearer picture of the diversity of early angiosperms (Doyle, 1978, 1984; Doyle and Hickey, 1976; Crane et al., 1986), their environments of deposition (Hickey and Doyle, 1977), the nature of plant response to Cretaceous-Tertiary boundary events (Wolfe, 1987), the changes in angiosperm fruit and seed sizes as correlated with the increase in forest dominance and changes in dispersal mode over time (Tiffney, 1984, 1986; Wing and Tiffney, 1987), and changes in floristic and physiognomic forest compositions correlated with climatic fluctuations (Leopold and MacGinitie, 1972; Wolfe, 1978, 1981b).
20
Hotsanyuk, Halyna, Antonina Ivanina, Yaryna Tuzyak, and Ihor Shaynoha. ""Paleontological collection" - 60 years!" Paleontological Collection 53 (2021): 3–9. http://dx.doi.org/10.30970/pal.53.01.
Повний текст джерелаАнотація:
The “Paleontological Collection” celebrates its 60th anniversary. It was founded in 1961 by the Lviv Geological Society of the Ivan Franko National University of Lviv on the initiative of Academician O. Vyalov. This collection is the only professional publication in Ukraine in the field of paleontology and biostratigraphy, which publishes works on current issues of paleontology, taphonomy, paleoecology, biostratigraphy of the Upper Precambrian, Paleozoic, Mesozoic, Cenozoic of Ukraine; scientific chronicle; results of paleontological research of different groups of ancient organisms; works on topical issues of regional stratigraphy. As of 2021, 52 issues of the “Paleontological Collection” and 58 of its volumes have been published, containing more than 1,150 articles on various paleontological and stratigraphic topics.
21
Whittam, D. B., M. S. Norvick, and C. L. Mclntyre. "MESOZOIC AND CAINOZOIC TECTONOSTRATIGRAPHY OF WESTERN ZOCA AND ADJACENT AREAS." APPEA Journal 36, no. 1 (1996): 209. http://dx.doi.org/10.1071/aj95012.
Повний текст джерелаАнотація:
Increased exploration activity in Area A of the Timor Gap Zone of Cooperation between Australia and Indonesia (ZOCA) has created the need for revision of the existing stratigraphic framework of the region. A chronostratigraphic approach to the analysis of the Mesozoic and Cainozoic succession of Western ZOCA provides a framework for improved stratigraphic prediction. The framework is based on the identification of depositional sequences by the integration of seismic and well data. Genetically related depositional sequences have been grouped into seven 'megasequences' which reflect distinct stages in the tectonic development of the basin.The Mesozoic and Cainozoic succession in the Northern Bonaparte Basin was deposited in a marginal sag basin that was affected by Triassic to Lower Cretaceous extension related to continental separation along the northwest margin of Australia. Four stages are seen in the evolution of the basin since the end of the Permian. Relative tectonic quiescence during the Triassic preceded two cycles of extension related to continental separation during the Jurassic to Earliest Cretaceous. Continental separation was followed by the development of a Cretaceous/Tertiary passive margin and a subsequent phase of tectonism related to the Miocene/Pliocene collision of the Indo-Australian and Eurasian plates. A tentative correlation has been made between the megasequence framework of Western ZOCA and the geological succession exposed on Timor Island.The framework forms the basis for a system of common stratigraphic nomenclature for the Timor Gap. The model also assists in understanding the tectono-strati-graphic evolution of the basin and is a foundation for the development of new play concepts that will support continuing exploration activity in the area.
22
Shubin, Neil H., and Hans-Dieter Sues. "Biogeography of early Mesozoic continental tetrapods: patterns and implications." Paleobiology 17, no. 3 (1991): 214–30. http://dx.doi.org/10.1017/s0094837300010575.
Повний текст джерелаАнотація:
The stratigraphic framework for Triassic and Early Jurassic continental strata has greatly changed in recent years. These revised correlations necessitate a review of traditional views of early Mesozoic continental faunal succession and biogeography. We have examined the relationship between tetrapod distribution and paleogeographic context during the Triassic and Early Jurassic on the basis of a data base comprising updated faunal lists for major early Mesozoic assemblages of continental tetrapods. Analysis of these data supports the hypothesis that there were few barriers to biotic interchange among continental tetrapods throughout the Triassic and Early Jurassic. Early Mesozoic tetrapod assemblages are dominated by widely distributed, often cosmopolitan families. Late Triassic patterns of latitudinal variation among tetrapod assemblages appear to be correlated to those seen among terrestrial plants and contrast with the extremely uniform distribution of Early Jurassic continental biotas.
23
Gartrell, Anthony, Jose Torres, Matt Dixon, and Myra Keep. "Mesozoic rift onset and its impact on the sequence stratigraphic architecture of the Northern Carnarvon Basin." APPEA Journal 56, no. 1 (2016): 143. http://dx.doi.org/10.1071/aj15012.
Повний текст джерелаАнотація:
Ages varying from Late Triassic to Early Jurassic have been proposed by different authors for the onset of rifting in the Northern Carnarvon Basin. Seismic sections from the Exmouth Sub-basin and outer Exmouth Plateau demonstrate significant growth strata associated with displacement on normal faults starting at least at the base of the R. rhaetica zone (Rhaetian). This tectonic event coincides with a marked change in sequence architecture and a large landward shift (~300 km) of the paleo-shoreline to the vicinity of the Rankin and Alpha Arch trends. Rapid creation of accommodation in the inboard narrow rift basins (Exmouth, Barrow and Dampier sub-basins) is suggested to be the most likely cause of this major transgression. The preferential development of associated carbonate build-ups during the Rhaetian on the footwall side of active tilted fault blocks provides additional evidence for the onset of significant extensional faulting occurring during this time. An earlier more subtle initiation phase of rifting, however, is interpreted during the Norian, from around the middle part of the H. balmei biozone time, above which a change in stratigraphic architecture from aggrading to retrograding occurs. The observed structural and stratigraphic transitions can be related to typical phases of evolution described in many rift basins around the world. The work highlights the importance of integrating regional structural geology, sequence stratigraphy and depositional systems observations to provide robust constraints for basin evolutions.
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SANSOM, IVAN J. "Late Triassic (Rhaetian) conodonts and ichthyoliths from Chile." Geological Magazine 137, no. 2 (March 2000): 129–35. http://dx.doi.org/10.1017/s0016756800003757.
Повний текст джерелаАнотація:
The Late Triassic of the back arc Domeyko Basin, Chile is characterized by the onset of marine sedimentation that persisted throughout the rest of the Mesozoic. Carbonate bulk samples from the Punta del Viento Limestone Formation have yielded a numerically small, but apparently widespread, conodont fauna including Epigondolella mosheri, Epigondolella englandi and Neogondolella steinbergensis. These specimens indicate a Rhaetian (Epigondolella mosheri conodont Biozone roughly equivalent to the Paracochloceras amoenum ammonoid Biozone) age for this unit. Their recovery represents the first record of conodonts from Chile, and also indicates a considerable potential for use in correlating sequence stratigraphic events within the Mesozoic Marginal Sea in Colombia, Peru and Chile.
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Miall, Andrew D. "Logan Medallist 3. Making Stratigraphy Respectable: From Stamp Collecting to Astronomical Calibration." Geoscience Canada 42, no. 3 (July 29, 2015): 271. http://dx.doi.org/10.12789/geocanj.2015.42.072.
Повний текст джерелаАнотація:
The modern science of stratigraphy is founded on a nineteenth-century empirical base – the lithostratigraphy and biostratigraphy of basin-fill successions. This stratigraphic record comprises the most complete data set available for reconstructing the tectonic and climatic history of Earth. However, it has taken two hundred years of evolution of concepts and methods for the science to evolve from what Ernest Rutherford scornfully termed “stamp collecting” to a modern dynamic science characterized by an array of refined methods for documenting geological rates and processes. Major developments in the evolution of the science of stratigraphy include the growth of an ever-more precise geological time scale, the birth of sedimentology and basin-analysis methods, the influence of plate tectonics and, most importantly, the development, since the late 1970s, of the concepts of sequence stratigraphy. Refinements in these concepts have required the integration of all pre-existing data and methods into a modern, multidisciplinary approach, as exemplified by the current drive to apply the retrodicted history of Earth’s orbital behaviour to the construction of a high-precision ‘astrochronological’ time scale back to at least the Mesozoic record. At its core, stratigraphy, like much of geology, is a field-based science. The field context of a stratigraphic sample or succession remains the most important starting point for any advanced mapping, analytical or modeling work.RÉSUMÉLa science moderne de la stratigraphie repose sur une base empirique du XIXe siècle, soit la lithostratigraphie et la biostratigraphie de successions de remplissage de bassins sédimentaires. Cette archive stratigraphique est constituée de la base de données la plus complète permettant de reconstituer l’histoire tectonique et climatique de la Terre. Cela dit, il aura fallu deux cents ans d’évolution des concepts et des méthodes pour que cette activité passe de l’état de « timbromanie », comme disait dédaigneusement Ernest Rutherford, à l’état de science moderne dynamique caractérisée par sa panoplie de méthodes permettant de documenter les rythmes et processus géologiques. Les principaux développements de l’évolution de la science de la stratigraphie proviennent de l’élaboration d’une échelle géologique toujours plus précise, l’avènement de la sédimentologie et des méthodes d’analyse des bassins, de l’influence de la tectonique des plaques et, surtout du développement depuis la fin des années 1970, des concepts de stratigraphie séquentielle. Des raffinements dans ces concepts ont nécessité l'intégration de toutes les données et méthodes existantes dans une approche moderne, multidisciplinaire, comme le montre ce mouvement actuel qui entend utiliser la reconstitution de l’histoire du comportement orbital de la Terre pour l’élaboration d’une échelle temporelle « astrochronologique » de haute précision, remontant jusqu’au Mésozoïque au moins. Comme pour la géologie, la stratigraphie est une science de terrain. Le contexte de terrain d’un échantillon stratigraphique ou d’une succession demeure le point de départ le plus important, pour tout travail sérieux de cartographie, d’analyse ou de modélisation.
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Gao, Ke-Qin, Jianye Chen, and Jia Jia. "Taxonomic diversity, stratigraphic range, and exceptional preservation of Juro-Cretaceous salamanders from northern China." Canadian Journal of Earth Sciences 50, no. 3 (March 2013): 255–67. http://dx.doi.org/10.1139/e2012-039.
Повний текст джерелаАнотація:
Since the late 1990s, eight localities in volcanic shale-rich lacustrine deposits of Middle Jurassic through Early Cretaceous age in northern China (western Liaoning Province, northern Hebei Province, and southern Inner Mongolia) have yielded thousands of exceptionally well-preserved salamander specimens. With 10 species published and several new taxa yet to be named and described, the fossil samples from northern China represent the most species-diverse, individually abundant, and exquisitely preserved salamander fossil assemblage known from the Mesozoic Era. The stratigraphic range of the fossil record covers a geologic time span of roughly 40–45 million years from the Middle Jurassic (Bathonian) through the Early Cretaceous (Aptian). In contrast to the well-known stem-group salamanders Karaurus and Kokartus from the Middle to Late Jurassic of Middle Asia, the Chinese record contains the earliest known crown-group salamanders, including Jurassic representatives of both Cryptobranchoidea and Salamandroidea. The Chinese Mesozoic record includes numerous examples of virtually complete larval, juvenile, young adult, and fully grown adult individuals that collectively provide key information on the life histories and developmental patterns of the earliest known crown-group salamanders. Many specimens show preservation of soft tissue structures, including body outline, eye, liver, and external gill filaments. This kind of soft tissue preservation is unusual for fossil salamanders, so the Chinese Mesozoic specimens are important for furnishing otherwise unavailable information on the life history, diversity, and ecological adaptations of early crown-group salamanders.
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Tasli, Kemal. "Benthic Foraminifera of the Upper Jurassic Platform Carbonate Sequence in the Aydincik (Içel) Area, Central Taurides, S Turkey." Geologia Croatica 54, no. 1 (June 30, 2001): 1–13. http://dx.doi.org/10.4154/gc.2001.01.
Повний текст джерелаАнотація:
The Upper Jurassic sequence of the Aydincik (Içel) area consists of platform limestones which were deposited in a subtidal, restricted lagoon environment. Stratigraphic distribution of benthic foraminifera and calcareous algae, examined in thin-sections, is shown in a range-chart. The microfossil assemblage indicates the Salpingoporella sellii subzone of the Kurnubia palastiniensis cenozone, corresponding approximately to the lower part of the Malm. Some benthic foraminifera with considerable stratigraphic value within the Mesozoic Tethys are described. Among the benthic foraminifera, taxa of the family Pfenderinidae, especially the subfamily Kurnubiinae, are dominant and frequent throughout the sequence. The planispirally coiled taxa are represented by the families Nautiloculinidae, Charentiidae and Cyclamminidae (subfamily Bucciccrenatinae).
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Cosgrove, G. I. E., L. Colombera, and N. P. Mountney. "Eolian stratigraphic record of environmental change through geological time." Geology 50, no. 3 (November 22, 2021): 289–94. http://dx.doi.org/10.1130/g49474.1.
Повний текст джерелаАнотація:
Abstract The terrestrial sedimentary record provides a valuable archive of how ancient depositional systems responded to and recorded changes in Earth's atmosphere, biosphere, and geosphere. However, the record of these environmental changes in eolian sedimentary successions is poorly constrained and largely unquantified. Our study presents the first global-scale, quantitative investigation of the architecture of eolian systems through geological time via analysis of 55 case studies of eolian successions. Eolian deposits accumulating (1) under greenhouse conditions, (2) in the presence of vascular plants and grasses, and (3) in rapidly subsiding basins associated with the rifting of supercontinents are represented by significantly thicker eolian dune-set, sand-sheet, and interdune architectural elements. Pre-vegetation eolian systems are also associated with more frequent interactions with non-eolian environments. The interplay of these forcings has resulted in dune-set thicknesses that tend to be smallest and largest in Proterozoic and Mesozoic successions, respectively. In the Proterozoic, the absence of sediment-binding plant roots rendered eolian deposits susceptible to post-depositional wind deflation and reworking by fluvial systems, whereby highly mobile channels reworked contiguous eolian deposits. During the Mesozoic, humid greenhouse conditions (associated with relatively elevated water tables) and high rates of basin subsidence (associated with the breakup of Pangea) favored the rapid transfer of eolian sediment beneath the erosional baseline. The common presence of vegetation promoted accumulation of stabilizing eolian systems. These factors acted to limit post-depositional reworking. Eolian sedimentary deposits record a fingerprint of major environmental changes in Earth history: climate, continental configuration, tectonics, and land-plant evolution.
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Erlström, M., L. O. Boldreel, S. Lindström, L. Kristensen, A. Mathiesen, M. S. Andersen, L. H. Nielsen, and E. Kamla. "Stratigraphy and geothermal assessment of Mesozoic sandstone reservoirs in the Øresund Basin – exemplified by well data and seismic profiles." Bulletin of the Geological Society of Denmark 66 (July 4, 2018): 123–49. http://dx.doi.org/10.37570/bgsd-2018-66-06.
Повний текст джерелаАнотація:
The Øresund Basin in the transnational area between Sweden and Denmark forms a marginal part of the Danish Basin. The structural outline and stratigraphy of the Mesozoic succession is described, and a novel interpretation and description of the subsurface geology and geothermal potential in the North Sjælland Half-graben is presented. The subsurface bedrock in the basin includes several Mesozoic intervals with potential geothermal sandstone reservoirs. Parts of the succession fulfill specific geological requirements with regard to distribution, composition and quality of the sandstones. A characterisation of these is presently of great interest in the attempt to identify geothermal reservoirs suitable for district heating purposes. The results presented in this paper include for the first time a comprehensive description of the stratigraphic intervals as well as the characteristics of the potential Mesozoic geothermal reservoirs in the Øresund region, including their distribution, composition and physical properties. This is illustrated by seismic cross-sections and well sections. In addition, results from analyses and evaluations of porosity, permeability, formation fluids and temperature are presented. Six potential geothermal reservoirs in the Mesozoic succession are described and assessed. Primary focus is placed on the characteristics of the reservoirs in the Lower Triassic and Rhaetian–Lower Jurassic succession. The study shows that the Mesozoic reservoir sandstones vary considerably with respect to porosity and permeability. Values range between 5–25% for the pre-Rhaetian Triassic sandstones and are commonly >25% for the Rhaetian–Lower Jurassic and Lower Cretaceous sandstones. The corresponding permeability rarely reaches 500 mD for the pre-Rhaetian Triassic reservoirs, while it is commonly above one Darcy for the Rhaetian–Lower Jurassic and the Lower Cretaceous sandstones. The interpreted formation temperatures are 45–50°C at 1500 m, 60–70°C at 2000 m and 70–90°C at 2500 m depth. The combined results provide a geological framework for making site-specific predictions regarding appraisal of viable geothermal projects for district heating purposes in the region as well as reducing the risk of unsuccessful wells.
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Kulikov, V. S., V. V. Kulikova, and A. K. Polin. "NEW CHRONOSTRATIC SCHEME OF SOUTH-EASTERN FENNOSCANDIA AND ITS USE IN THE PREPARATION OF SMALL-SCALE GEOLOGICAL MAPS OF THE PRECAMBRIAN REGIONS." Proceedings of higher educational establishments. Geology and Exploration, no. 5 (October 28, 2017): 5–12. http://dx.doi.org/10.32454/0016-7762-2017-5-5-12.
Повний текст джерелаАнотація:
A new chronostratic scheme of South-East (SE) Fennoscandia has been developed, based on the International Stratigraphie Scale, taking into account some elements of the Common Stratigraphic Scale of Russia and the regional stratigraphic scheme of the North-West (NW) of Russian Federation. A rank of Archean and Proterozoic stratons has been determined (including supersystems for Riphean and Archean geonotems), compatable in dutation to the Phanerozoic systems (Mesozoic and Paleozoic ones). An original coloring for the geological maps of the newly allocated systems and their analogues in the Precambrian, as well as the digital indexing of all stratons of the rank of systems instead of the traditional alphabetic one, have been proposed. Based on the extensive geological materials of the Institute of Geology of Karelian Research Centre of the Russian Academy of Sciences, in view of the new approaches and reliable geochronological data, an areal geological map of SE Fennoscandia in scale 1: 750 000 has been created, which includes the territory of Karelia and adjacent areas of the Russian Federation and eastern Finland. The proposed chronostratic scheme can serve as a basis for developing legends of small-scale state geological maps of the new generation, especially in the regions of the Precambrian development.
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Venkatachala, B. S., and A. Rajanikanth. "Stratigraphic implication of 'Late Gondwana' floras in the East Coast." Journal of Palaeosciences 36 (December 31, 1987): 183–96. http://dx.doi.org/10.54991/jop.1987.1576.
Повний текст джерелаАнотація:
The Cauvery, Palar, Krishna-Godavari and Mahanadi basins in the East Coast of India include coeval, paralic, lagoonal and deltaic Mesozoic (‘Late Gondwana’) deposits distributed in detached outcrops. The ‘Ptilophyllum Flora’ characterizing these sediments was earlier considered Jurassic in age. Considerable floristic and stratigraphic data have accrued necessitating a relook on earlier age assignments and stratigraphic placements. Biostratigraphic evidences considered in toto suggest an Early Cretaceous age to the flora found in these sediments. Sedimentation of these sediments is attributed to rifting of the Indian Plate coupled with a reactivation phase. It is recommended that the term ‘Gondwana’ should either be recircumscribed to include marine coastal sediments or discontinued in favor of the usage of chronostratigraphic terminology.
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Kirkland, James, Marina Suarez, Celina Suarez, and ReBecca Hunt-Foster. "The Lower Cretaceous in east-central Utah—The Cedar Mountain Formation and its bounding strata." Geology of the Intermountain West 3 (January 1, 2016): 101–228. http://dx.doi.org/10.31711/giw.v3.pp101-228.
Повний текст джерелаАнотація:
Although only recognized as a discrete stratigraphic unit since 1944, the Cedar Mountain Formation represents tens of millions of years of geological and biological history on the central Colorado Plateau. This field guide represents an attempt to pull together the results of recent research on the lithostratigraphy, chronostratigraphy, sequence stratigraphy, chemostratigraphy, and biostratigraphy of these medial Mesozoic strata that document the dynamic and complex geological history of this region. Additionally, these data provide a framework by which to examine the history of terrestrial faunas during the final breakup of Pangaea. In fact, the medial Mesozoic faunal record of eastern Utah should be considered a keystone in understanding the history of life across the northern hemisphere. Following a period of erosion and sediment bypass spanning the Jurassic–Cretaceous boundary, sedimentation across the quiescent Colorado Plateau began during the Early Cretaceous. Thickening of these basal Cretaceous strata across the northern Paradox Basin indicate that salt tectonics may have been the predominant control on deposition in this region leading to the local preservation of fossiliferous strata, while sediment bypass continued elsewhere. Thickening of overlying Aptian strata west across the San Rafael Swell provides direct evidence of the earliest development of a foreland basin with Sevier thrusting that postdates geochemical evidence for the initial development of a rain shadow.
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Hunt-Foster, ReBecca, Martin Lockley, Andrew Milner, John Foster, Neffra Matthews, Brent Breithaupt, and Joshua Smith. "Tracking dinosaurs in BLM canyon country, Utah." Geology of the Intermountain West 3 (January 1, 2016): 67–100. http://dx.doi.org/10.31711/giw.v3.pp67-100.
Повний текст джерелаАнотація:
Although only recognized as a discrete stratigraphic unit since 1944, the Cedar Mountain Formation represents tens of millions of years of geological and biological history on the central Colorado Plateau. This field guide represents an attempt to pull together the results of recent research on the lithostratigraphy, chronostratigraphy, sequence stratigraphy, chemostratigraphy, and biostratigraphy of these medial Mesozoic strata that document the dynamic and complex geological history of this region. Additionally, these data provide a framework by which to examine the history of terrestrial faunas during the final breakup of Pangaea. In fact, the medial Mesozoic faunal record of eastern Utah should be considered a keystone in understanding the history of life across the northern hemisphere. Following a period of erosion and sediment bypass spanning the Jurassic–Cretaceous boundary, sedimentation across the quiescent Colorado Plateau began during the Early Cretaceous. Thickening of these basal Cretaceous strata across the northern Paradox Basin indicate that salt tectonics may have been the predominant control on deposition in this region leading to the local preservation of fossiliferous strata, while sediment bypass continued elsewhere. Thickening of overlying Aptian strata west across the San Rafael Swell provides direct evidence of the earliest development of a foreland basin with Sevier thrusting that postdates geochemical evidence for the initial development of a rain shadow.
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Kirkland, James I., Marina Suarez, Celina Suarez, and ReBecca Hunt-Foster. "The Lower Cretaceous in east-central Utah—The Cedar Mountain Formation and its bounding strata." Geology of the Intermountain West 3 (May 26, 2016): 101–228. http://dx.doi.org/10.31711/giw.v3i0.9.
Повний текст джерелаАнотація:
Although only recognized as a discrete stratigraphic unit since 1944, the Cedar Mountain Formation represents tens of millions of years of geological and biological history on the central Colorado Plateau. This field guide represents an attempt to pull together the results of recent research on the lithostratigraphy, chronostratigraphy, sequence stratigraphy, chemostratigraphy, and biostratigraphy of these medial Mesozoic strata that document the dynamic and complex geological history of this region. Additionally, these data provide a framework by which to examine the history of terrestrial faunas during the final breakup of Pangaea. In fact, the medial Mesozoic faunal record of eastern Utah should be considered a keystone in understanding the history of life across the northern hemisphere. Following a period of erosion and sediment bypass spanning the Jurassic–Cretaceous boundary, sedimentation across the quiescent Colorado Plateau began during the Early Cretaceous. Thickening of these basal Cretaceous strata across the northern Paradox Basin indicate that salt tectonics may have been the predominant control on deposition in this region leading to the local preservation of fossiliferous strata, while sediment bypass continued elsewhere. Thickening of overlying Aptian strata west across the San Rafael Swell provides direct evidence of the earliest development of a foreland basin with Sevier thrusting that postdates geochemical evidence for the initial development of a rain shadow.
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Lockley, Martin, Kelly Conrad, and Marc Paquette. "Distribution and Significance of Mesozoic Vertebrate Trace Fossils in Dinosaur National Monument." UW National Parks Service Research Station Annual Reports 15 (January 1, 1991): 85–90. http://dx.doi.org/10.13001/uwnpsrc.1991.2977.
Повний текст джерелаАнотація:
Dinosaur National Monument (DNM) encompasses a large area with surface exposures of Mesozoic rocks. Although only one isolated footprint (from an unknown locality) had previously been discovered at DNM, there is a high potential for preservation of fossil footprints in this area, as has been proven by discoveries in similar rocks in the region around DNM, and during research activity at DNM. As reported by Lockley et al. (1990), the purpose of this research is to seek, document and interpret vertebrate trace fossils in any of the ten potentially track-bearing Mesozoic stratigraphic units in which footprints might be discovered. During the course of the first year (6/90-6/91) the University of Colorado at Denver Research Group documented 11 localities where tracks were discovered at one or more stratigraphic levels (Lockley et al. 1990, 1991). In the first part of the second year of investigation (7/91-1 0/91) the research group discovered an additional five localities, and three additional sites were reported to us by Park Paleontologists and other researchers. This brings the total to 19 localities, of which three include at least two levels with tracks (Total = 22 localities). As discussed below, the tracks provide evidence of the activities of several dozen animals that represent distinct ancient animal communities.
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Grimaldi, David, Dalton De Souza Amorim, and Vladimir Blagoderov. "The Mesozoic family Archizelmiridae (Diptera: Insecta)." Journal of Paleontology 77, no. 2 (March 2003): 368–81. http://dx.doi.org/10.1017/s0022336000043705.
Повний текст джерелаАнотація:
A nematocerous fly family known previously only from one species and specimen from the Upper Jurassic of Karatau, Kazakhstan, Archizelmiridae is expanded here to include additional records preserved as compression fossils and ones in amber. The compressions are from the Upper Jurassic of Shar-Teg, Mongolia and Lower Cretaceous of Baissa, Transbaikal, with a new species, Archizelmira baissa, from Baissa. Particularly significant are three finely preserved new species and genera in ambers from the Cretaceous Period: Zelmiarcha lebanensis (Lebanon: Lower Aptian), Archimelzira americana (New Jersey: Turonian), and Burmazelmira aristica (Burma [Myanmar]: mid-Cretaceous). The latter two species interestingly possess stylate antennae, those of Burmazelmira being the only aristate antennae in the order Diptera outside the suborder Brachycera. A cladogram is presented for the relationships among archizelmirid species, cladistic rank of which correlates with stratigraphic age. Transformation series of the antennal flagellum in Archizelmiridae corresponds with one recently hypothesized for the Brachycera, wherein the style and arista are derived from the apical flagellomere(s). The family appears to be a member of the extant group Sciaroidea, which includes fungus gnats and gall midges, though precise relationships remain unclear.
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Wang, Gaiyun, Xiguang Deng, Jinping Liu, and Min Du. "STRATIGRAPHIC CHARACTERISTICS OF THE MESOZOIC-CENOZOIC IN THE SOUTH SHETLAND ISLANDS, ANTARCTICA." CHINESE JOURNAL OF POLAR RESEARCH 25, no. 2 (January 7, 2014): 161–66. http://dx.doi.org/10.3724/sp.j.1084.2013.00161.
Повний текст джерела
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Krisnabudhi, Alfathony, Benyamin Sapiie, Agus Men Riyanto, Adi Gunawan, and Febriana Fiona Rizky. "Mesozoic-Cenozoic Stratigraphy and Tectonic Development of the Southern Great Tarakan Basin, Northeast Borneo, Indonesia." Rudarsko-geološko-naftni zbornik 37, no. 1 (2022): 123–38. http://dx.doi.org/10.17794/rgn.2022.1.11.
Повний текст джерелаАнотація:
We analyzed the tectonics and stratigraphy of the Southern Great Tarakan Basin to determine its tectonic evolution during the Mesozoic-Cenozoic Eras, the evolution of basin geometry, and the potential of hydrocarbon using integrated surface and subsurface data. Southern Great Tarakan Basin can be divided into three sub-basins, Berau, Muara, and South Tarakan. They comprise deposits of Jurassic to Quaternary age, which can be assigned five mega sequences based on their lithological characteristics and tectonic development. We divide the tectonic events into four main phases; (1) contractional Jurassic-Cretaceous, (2) extensional Paleogene, (3) subsidence Early Neogene, and (4) contractional Late Neogene. The development of the strike-slip activity influenced the geometric evolution of the two sub-basins. NW-SE transpressional structures formed during the contraction phase caused most of the existing structure in Paleogene reactivated and inverted, followed by basement uplift and erosion. Consequently, the evolution of the transpressional system caused The Great Tarakan Basin to be divided into five sub-basins during the Late Miocene-Pliocene. Moreover, five horizons with hydrocarbon potential exist in the southern part of The Greater Tarakan Basin; three plays in the Berau Sub-basin, and two main plays in the Muara Sub-basin. The Late Neogene structures in the Berau Sub-basin control the accumulation, migration, and trapping mechanism, whereas these structures do not exist in Muara; hence, this sub-basin is dominated by stratigraphic traps.
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Velić, Ivo. "Stratigraphy and Palaeobiogeography of Mesozoic Benthic Foraminifera - Part 1." Geologia Croatica 60, no. 1 (2007): 1–113. http://dx.doi.org/10.4154/gc.2007.01a.
Повний текст джерелаАнотація:
The Adriatic Carbonate Platform (AdCP), was a separate shallowmarine depositional system characterized by a lack of terrigenous input and was connected to Gondwana towards the South via Gavrovo–Tripolitza or Apulia. It existed for approximately 120 MY, from the Early Jurassic Pliensbachian/Toarcian) to the end of the Cretaceous, resulting in a 4000–6500 m thick succession of almost pure carbonates. However, this is part of a thicker (>8000 m) sequence of predominantly carbonate rocks which forms the Karst Dinarides, and was deposited during more than 270 MY – at least from the Carboniferous (Moscovian) to the Late Eocene. Among many different groups of fossil organisms, benthic foraminifera are especially abundant and well preserved, so they, along with calcareous algae (Dasycladales), are the most important fossils used for age determination and stratigraphic subdivision of shallow-marine carbonate deposits. Within the 257 determined taxa belonging to different foraminiferal families which lived through the Mesozoic, numerous different index fossils occur in assemblages indicating various ages: Early Triassic, Anisian, Carnian, Norian–Rhaetian, Late Sinemurian, Early and Late Pliensbachian (Carixian and Domerian), Early and Late Aalenian, Early and Late Bajocian, Early and Late Bathonian, Callovian, Early and Late Oxfordian, Kimmeridgian, Tithonian, Berriasian, Valanginian, Late Hauterivian, Late Barremian, Early and Late Aptian (Bedulian and Gargasian), Early and Late Albian, Early, Middle and Late Cenomanian, Turonian, Coniacian, Santonian, Early and Late Campanian and Early and Late Maastrichtian. A total of 64 biostratigraphic units – biozones of different categories, from subzone to superzone, were defined within the stratigraphic interval from the Carnian to the Late Maastrichtian. This enabled very detailed biostratigraphic subdivision of the carbonate deposits within the Karst Dinarides. This is one of the most precise sequences, not only in this area, but also among former shallow marine deposits of the entire Neotethyan realm in the present Mediterranean region. The palaeobiogeographic characteristics of biotopes and the composition of foraminiferal assemblages during the Mesozoic were controlled by the position of the study area within the Neotethyan bioprovinces. Until the Albian, this area represented part of the Southern Neotethyan bioprovince, while from the Cenomanian to its final disintegration at the end of the Cretaceous it belonged to a separate, Central Mediterranean Neotethyan bioprovince.
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Hart, Bruce, and Scott Cooper. "Mechanical stratigraphy in Mesozoic rocks of the San Juan Basin: Integration of stratigraphic and structural terms and concepts." Mountain Geologist 58, no. 2 (April 1, 2021): 159–204. http://dx.doi.org/10.31582/rmag.mg.58.2.159.
Повний текст джерелаАнотація:
We characterize relationships between stratigraphy and natural fractures in outcrops of Mesozoic strata that rim the San Juan Basin in New Mexico and Colorado. These outcrops expose fluvial and shallow-marine siliciclastic deposits and calcareous mudstones deposited in a distal marine setting. We focus primarily on a regionally extensive fracture set formed during the Eocene to minimize localized tectonic effects on fracture development. Where possible, we supplement our observations with wireline log- or laboratory-derived measurements of rock properties. Our goals are twofold: 1) to illustrate how direct integration of data and concepts from stratigraphy and structural geology can lead to better fracture characterization, and 2) to develop thought processes that will stimulate new exploration and development strategies. Genetic beds form one scale of stratification in the outcrops we describe. For example, sandstone beds can be arranged into coarsening and thickening upward successions that are the depositional record of shoreline progradation. In fluvial settings, cm- to dm-scale sandstone beds can also be part of m-scale single-storey channel complexes that, themselves, can be arranged into amalgamated channel complexes 10s of m thick. In these and other settings, it is important to distinguish between beds and features that can be defined via wireline logs because it is the former (cm- to dm-scale) that are usually the primary control the distribution of natural fractures. The extension fractures we describe are typically bed-bound, with bedding being defined by lithology contrasts and the associated changes in elastic properties. Fracture spacing distributions are typically lognormal with average spacing being less than bed thickness. Although mechanical bedding and depositional bedding are commonly the same, diagenesis can cut across bed boundaries and complicate this relationship, especially where lithologic contrasts are small. Deposits from similar depositional environments which undergo different diagenetic histories can have substantially different mechanical properties and therefore deform differently in response to similar imposed stresses.
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Blechschmidt, Ingo, Paulian Dumitrica, Albert Mater, Leopold Krystyn, and Tjerk Peters. "Stratigraphic architecture of the northern Oman continental margin - Mesozoic Hamrat Duru Group, Hawasina complex, Oman." GeoArabia 9, no. 2 (April 1, 2004): 81–132. http://dx.doi.org/10.2113/geoarabia090281.
Повний текст джерелаАнотація:
ABSTRACT The Triassic to Late Cretaceous deep-marine sediments of the Hamrat Duru Group, Oman Mountains, represent a subunit of the Hawasina nappe-complex which was deposited in a deep marine basin. During the Late Cretaceous SSW-directed obduction of the Semail Ophiolite, the Hawasina complex was emplaced onto the autochthonous cover of the Arabian basement, while the original configuration of the basin was destroyed. New lithostratigraphic results and high-resolution radiolarian and conodont biostratigraphy lead to a revised stratigraphic scheme of the Hamrat Duru Group which conforms with the standard stratigraphical nomenclature. The Hamrat Duru Group is divided into six formations: (1) The Early Triassic (Olenekian) to Late Triassic (Upper Norian) Zulla Formation (Limestone and Shale Member, Sandstone and Shale Member, Radiolarian Chert Member and Halobia Limestone Member); (2) The Late Triassic (late Norian to Rhaetian) Al Ayn Formation; (3) The Early Jurassic (late Pliensbachian) to Middle Jurassic (early Callovian) Guwayza Formation (Tawi Sadh Member and Oolitic Limestone Member); (4) Middle Jurassic (Callovian) to Late Cretaceous (Cenomanian?) Sid’r Formation (Lower Member, Upper Member); (5) Late Cretaceous (Cenomanian? to Santonian?) Nayid Formation; and (6) Late Jurassic (early Callovian) to Early (Late?) Cretaceous Wahrah Formation. Most of the lithostratigraphic units (formations and members) show isochronous boundaries between the different outcrop areas. The stratigraphic architecture of the Hamrat Duru Group megasequence is controlled by alternating siliciclastic and carbonate sedimentation possibly related to the second-order sea-level variations. The sediments accumulated on the continental rise of the Arabian margin mostly by submarine sediment-gravity flows and hemipelagic to pelagic rainout. A close relationship of the evolution of the Arabian Platform and the adjoining slope and basinal environments is evident. Changes in carbonate supply, oceanographic circulation and/or variations in silica productivity resulted in two distinct phases of radiolarian sedimentation. The first phase corresponds to the Triassic late Anisian-early Norian time interval; the second started in the Early Jurassic late Pliensbachian and lasted, with some interruptions, up to the Late Cretaceous Coniacian. The litho- and biostratigraphic similarities between the Mesozoic Hamrat Duru Basin of the northern/central Oman Mountains and the Mesozoic Batain Basin of northeastern Oman are seen as related to Neo-Tethys-wide palaeoceanographic changes and suggest a strong interdependence of the two basins with the evolution of the Arabian Platform.
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Shevchuk, Olena, and Kateryna Ivanchenko. "Acritarchs of the Mesozoic of Ukraine." Visnyk of V.N. Karazin Kharkiv National University, series Geology. Geography. Ecology, no. 55 (December 1, 2021): 107–16. http://dx.doi.org/10.26565/2410-7360-2021-55-08.
Повний текст джерелаАнотація:
Introduction. Acritarchs are one of the orthostratigraphic groups of microfossils that are widely used in Proterozoic and Paleozoic biostratigraphy. In the Mesozoic period there is a decrease in this group, and this is due to certain reasons. Formulation of the problem. Acritarchs are studied by palynologists from samples of Mesozoic sediments in combination with other representatives of organic bone microplankton, primarily with dinocysts. In the practice of Ukrainian micropaleontologists, the role of such a group as acritarchs, which may be unique in paleoecological reconstructions of the environment, is underestimated. History of the study of acritarchs. None of the researchers studied the group of acritarchs in the Mesozoic deposits of Ukraine. In scientific works it was noted only about the presence of these forms in the description of palynological complexes of Jurassic, Cretaceous and other times. Brief description of the group. Acritarchs are unicellular, non-colonial, organic microfossils. Formulation of the purpose of the article. The aim of the study was to focus on such a little-studied group for the Mesozoic as acritars and to prove its role and significance for stratigraphic and paleoecological constructions. Materials and methods. The research material was samples of rocks of the Middle, Upper Jurassic and Cretaceous deposits, selected separately from 93 sections, but from all major tectonic structures of Ukraine: Peninsky zone of the Carpathians, Volyn-Podolsk plate, western and eastern slopes of the Ukrainian Shield, Priazovsky array of the Ukrainian shield, Dnieper-Donetsk basin, Donbas, South Ukrainian monocline (Black Sea basin), Crimea, North-Azov depression and Azov shaft (Ukrainian part of the Sea of Azov). Presentation of the main material of the study. Acritarchs Jurassic and Cretaceous belong to 10 genera, including 11 species. The most common species found in both Jurassic and Cretaceous sediments of Ukraine are acritarchs Micrhystridium fragile and Fromea sp. Jurassic complexes are slightly richer than chalk in terms of percentage and are represented mainly by Micrhystridium spp., Micrhystridium flagile, M. longum, Veryhachium brevitrispinum, Wilsonastrum sp., Baltisphaeridium sp. Cretaceous: Micrhystridium spp., Micrhystridium fragile, M. longum, Baltisphaeridium breviciliatum, B. aff. capillatum, B. annelieae, B. accinctum, Acanthodiacrodium sp., Solisphaeridium inaffectum, Comasphaeridium sp., Comasphaeridium aff. brachyspinosum, Veryhachium spp., Veryhachium singulare, Leiofusa stoumonensis, Fromea sp., Ascostomocystis sp. The article presents photo tables of images of Jurassic and Cretaceous acritarchs. Conclusions. For the first time in Ukraine, acritarchs were found in samples from Jurassic and Cretaceous sediments and attention was focused on such a little-studied group for the Mesozoic. Their certain role and significance for stratigraphic and paleoecological constructions are proved, their species composition and vertical distribution in sections of Mesozoic sediments are studied. The regularities of the distribution of acritarchs in the same age layers are established. Analyzing the Jurassic and Cretaceous microfossils studied from Mesozoic sediments from 93 sections of different regions of Ukraine, we can say that the trend of disappearance of acritarchs during the Mesozoic is weakly observed. Jurassic forms of acritarchs are up to 5% in the complex, Cretaceous - up to 4%. The next stage of work should be the study of acritarch Jurassic and Cretaceous deposits of all regions of Ukraine for the purposes of the overall picture of the reproduction of paleoecological conditions in Ukraine during the Jurassic and Cretaceous period.
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Hunt-Foster, ReBecca K., Martin G. Lockley, Andrew R. C. Milner, John R. Foster, Neffra A. Matthews, Brent H. Breithaupt, and Joshua A. Smith. "Tracking dinosaurs in BLM canyon country, Utah." Geology of the Intermountain West 3 (May 26, 2018): 67–100. http://dx.doi.org/10.31711/giw.v3i0.8.
Повний текст джерелаАнотація:
Although only recognized as a discrete stratigraphic unit since 1944, the Cedar Mountain Formation represents tens of millions of years of geological and biological history on the central Colorado Plateau. This field guide represents an attempt to pull together the results of recent research on the lithostratigraphy, chronostratigraphy, sequence stratigraphy, chemostratigraphy, and biostratigraphy of these medial Mesozoic strata that document the dynamic and complex geological history of this region. Additionally, these data provide a framework by which to examine the history of terrestrial faunas during the final breakup of Pangaea. In fact, the medial Mesozoic faunal record of eastern Utah should be considered a keystone in understanding the history of life across the northern hemisphere.
Following a period of erosion and sediment bypass spanning the Jurassic–Cretaceous boundary, sedimentation across the quiescent Colorado Plateau began during the Early Cretaceous. Thickening of these basal Cretaceous strata across the northern Paradox Basin indicate that salt tectonics may have been the predominant control on deposition in this region leading to the local preservation of fossiliferous strata, while sediment bypass continued elsewhere. Thickening of overlying Aptian strata west across the San Rafael Swell provides direct evidence of the earliest development of a foreland basin with Sevier thrusting that postdates geochemical evidence for the initial development of a rain shadow.
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Campbell, Kathleen A., and David J. Bottjer. "Peregrinella: an Early Cretaceous cold-seep-restricted brachiopod." Paleobiology 21, no. 4 (1995): 461–78. http://dx.doi.org/10.1017/s0094837300013488.
Повний текст джерелаАнотація:
Brachiopods generally have not been considered to be typical or significant faunal components of modern or ancient hydrothermal vent and cold-seep settings. The Early Cretaceous (Neocomian) rhynchonellide brachiopodPeregrinellahas long been viewed as a paleontological curiosity because of its distinctive morphology, status as the largest Mesozoic brachiopod, anomalous stratigraphic associations, and widespread, yet discontinuous paleogeographic distribution. Examination of all worldwidePeregrinellaoccurrences (14) indicates restriction of this brachiopod to ancient cold-seeps. It is probable thatPeregrinellagrew to large sizes in such great abundances at fossil cold-seep sites because of a richly organic food supply generated by localized fluid seepage and bacterial chemosynthetic activity. Living brachiopods are not known to harbor chemosymbiotic bacteria in their tissues; however, direct chemoautotrophic utilization of reduced fluids byPeregrinellacannot be rejected or demonstrated at present.Peregrinellaoccurs at widely separated cold-seeps of Neocomian age (e.g., California, Mexico, Tibet, Europe), yet its mode of dispersal and larval development is unknown. In modern hydrothermal vents of the deep-sea, organism dispersal occurs along oceanic ridges, where benthic faunas display both planktotrophic and nonplanktotrophic larval-mode types.Peregrinellamay represent a Mesozoic relic of a long-lived “lineage” of vent-seep associated rhynchonellides from the Paleozoic (e.g., ?Eoperegrinella, Dzieduszyckia), but major gaps in the stratigraphic record between these rhynchonellide occurrences, and the lack of rigorous phylogenetic analysis for these groups preclude a clear resolution of the origin(s) of vent-seep brachiopods at present.
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Sendino, Consuelo. "The Natural History Museum Fossil Porifera Collection." Collections: A Journal for Museum and Archives Professionals 16, no. 4 (December 2020): 363–80. http://dx.doi.org/10.1177/1550190620964042.
Повний текст джерелаАнотація:
This article provides updated information about the Porifera Collection at The Natural History Museum (NHM), London. With very little information available regarding fossil sponge digitization or any similar initiative, this paper covers the type and figured specimens and drawer label content data of the Porifera Collection and also describes the collection and its research potential. With approximately 71,000 specimens, of which more than 60% are Mesozoic, the NHM holdings offer the best Mesozoic sponge collection in the world and one of the most important due to its breadth and depth. The Porifera Collection covers all stratigraphic periods and all taxonomic groups and includes almost 3000 cited and figured specimens including types. Although most of the specimens come from the British Isles, worldwide samples are also present, with abundant specimens from other Commonwealth countries and from Antarctica.
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Chen, Ying Fu, Gen Hou Wang, and Qing Tao Meng. "The Division of Zhangjiakou Formation of Later Jurassic at Jibei." Applied Mechanics and Materials 275-277 (January 2013): 1578–84. http://dx.doi.org/10.4028/www.scientific.net/amm.275-277.1578.
Повний текст джерелаАнотація:
There is not a unified division scheme on the lithostratigraphic unit of Zhangjiakou formation from later Jurassic at jibei for a long time, so it makes the divisions more confusion, the establishment of the reasonable stratigraphic sequence and regional stratigraphic correlation has been effected. The Zhangjiakou formation is divided into three lithologic members in turn based on lithology combination of the phase sequence at Zhangjiakou by author through the project of “the study of jibei Mesozoic continental volcanic-sedimentary basin 1:250000 mapping method”. The first section mainly includes lithology combination of weak eruption phase sequence. The second section is main the lithology combination of explosive phase sequence; the third section mainly includes lithology combination of the eruption phase sequence. These three sections respectively represent the stage of the initial outbreak, the large-scale outbreak and a caldera collapse deposition. This division method can reflect volcanic tectonic features, establishing reasonable stratigraphic sequence, this contribute to the study of the history of the volcanic evolution. It can also combine the lithostratigraphic units division and volcanic-sedimentary organically.
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Pattemore, Gary A., John F. Rigby, and Geoffrey Playford. "The Mesozoic megafossil genus Linguifolium Arber 1917." Acta Palaeobotanica 55, no. 2 (December 1, 2015): 123–47. http://dx.doi.org/10.1515/acpa-2015-0009.
Повний текст джерелаАнотація:
Abstract The plant megafossil genus Linguifolium Arber 1917 is chiefly known from the Middle and Upper Triassic of Gondwana. The range of Linguifolium extended beyond Gondwana by the Late Triassic, persisting there through the earliest Jurassic (Hettangian). The parent plants probably grew in a well-watered, canopied environment. Diagnoses of the genus and four of its species - Linguifolium tenison-woodsii (Shirley 1898) Retallack 1980, L. waitakiense Bell in Bell et al. 1956, L. parvum Holmes & Anderson in Holmes et al. 2010, and L. steinmannii (Solms-Laubach 1899) Arber 1917 - are emended with particular reference to venation and leaf morphology; consequently, the stratigraphic ranges of the species have been more precisely defined. Coalescent venation has previously been reported in some species of Linguifolium and is identified in new material described herein. Although the vast majority of specimens assigned to the genus are from the Upper Triassic, none shows coalescent venation. This character is entirely restricted to the Middle Triassic, in particular to two species: L. waitakiense and L. parvum. Linguifolium tenison-woodsii is restricted to the Carnian-lowermost Norian of Australia and South Africa and is recorded here for the first time from the Tarong Basin (upper Carnian), Queensland. Confusion regarding assignment of specimens to this species from the Middle Jurassic of Queensland is resolved.
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LI, Gang, Jianming GONG, Changqing YANG, Chuansheng YANG, Wenjuan WANG, Hairong WANG, and Sanzhong LI. "STRATIGRAPHIC FEATURES OF THE MESOZOIC “GREAT EAST CHINA SEA”—A NEW EXPLORATION FIELD." Marine Geology & Quaternary Geology 32, no. 3 (January 14, 2013): 97–104. http://dx.doi.org/10.3724/sp.j.1140.2012.03097.
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Leturmy, Pascale, and Cécile Robin. "Tectonic and stratigraphic evolution of Zagros and Makran during the Mesozoic-Cenozoic: introduction." Geological Society, London, Special Publications 330, no. 1 (2010): 1–4. http://dx.doi.org/10.1144/sp330.1.
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Riddell, Janet. "Lithostratigraphic and tectonic framework of Jurassic and Cretaceous Intermontane sedimentary basins of south-central British Columbia1This article is one of a series of papers published in this Special Issue on the theme of New insights in Cordilleran Intermontane geoscience: reducing exploration risk in the mountain pine beetle-affected area, British Columbia." Canadian Journal of Earth Sciences 48, no. 6 (June 2011): 870–96. http://dx.doi.org/10.1139/e11-034.
Повний текст джерелаАнотація:
The south-central Intermontane belt of British Columbia has a complex architecture comprising late Paleozoic to Mesozoic volcanic and plutonic arc magmatic suites, marine and nonmarine clastic basins, high-grade metamorphic complexes, and accretionary rocks. Jurassic and Cretaceous clastic basins within this framework contain stratigraphy with hydrocarbon potential. The geology is complicated by Cretaceous to Eocene deformation, dismemberment, and dislocation. The Eocene to Neogene history of the southern Intermontane belt is dominated by non-arc volcanism, followed by Pleistocene to Recent glaciation. The volcanic and glacial cover makes this a difficult region to explore for resources. Much recent work has involved re-evaluating the challenges that the overlying volcanic cover has historically presented to geophysical imaging of the sedimentary rocks in this region in light of technological advances in geophysical data collection and analysis. This paper summarizes the lithological and stratigraphic framework of the region, with emphasis on description of the sedimentary units that have been the targets of hydrocarbon exploration.