Journal articles: 'Jurassic stratigraphy'

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Zeiss, Arnold. "The Upper Jurassic of Europe: its subdivision and correlation." Geological Survey of Denmark and Greenland (GEUS) Bulletin 1 (October 28, 2003): 75–114. http://dx.doi.org/10.34194/geusb.v1.4649.

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In the last 40 years, the stratigraphy of the Upper Jurassic of Europe has received much attention and considerable revision; much of the impetus behind this endeavour has stemmed from the work of the International Subcommission on Jurassic Stratigraphy. The Upper Jurassic Series consists of three stages, the Oxfordian, Kimmeridgian and Tithonian which are further subdivided into substages, zones and subzones, primarily on the basis of ammonites. Regional variations between the Mediterranean, Submediterranean and Subboreal provinces are discussed and correlation possibilities indicated. The durations of the Oxfordian, Kimmeridgian and Tithonian Stages are reported to have been 5.3, 3.4 and 6.5 Ma, respectively. This review of the present status of Upper Jurassic stratigraphy aids identification of a number of problems of subdivision and definition of Upper Jurassic stages; in particular these include correlation of the base of the Kimmeridgian and the top of the Tithonian between Submediterranean and Subboreal Europe. Although still primarily based on ammonite stratigraphy, subdivision of the Upper Jurassic is increasingly being refined by the incorporation of other fossil groups; these include both megafossils, such as aptychi, belemnites, bivalves, gastropods, brachiopods, echinoderms, corals, sponges and vertebrates, and microfossils such as foraminifera, radiolaria, ciliata, ostracodes, dinoflagellates, calcareous nannofossils, charophyaceae, dasycladaceae, spores and pollen. Important future developments will depend on the detailed integration of these disparate biostratigraphic data and their precise combination with the abundant new data from sequence stratigraphy, utilising the high degree of stratigraphic resolution offered by certain groups of fossils. This article also contains some notes on the recent results of magnetostratigraphy and sequence chronostratigraphy.

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Matthews, Robley K., and Cliff Frohlich. "Maximum flooding surfaces and sequence boundaries: comparisons between observations and orbital forcing in the Cretaceous and Jurassic (65-190 Ma)." GeoArabia 7, no. 3 (July 1, 2002): 503–38. http://dx.doi.org/10.2113/geoarabia0703503.

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ABSTRACT We have undertaken a simplified calculation of orbital forcing back through the Cretaceous to the Late to Middle Jurassic from 65 to 190 Ma. So long as the Earth has a continental ice volume, orbital forcing will impose a 400-ky periodicity upon glacioeustasy and thereby on fourth-order sequence stratigraphy cycles. Similarly, third-order cycles were defined by orbital forcing of 2.4 ± 0.4 my (predominately 2.0- and 2.8-my cycles). These concepts greatly simplified the task of unraveling sequence stratigraphy. Our sea-level calculations are comparable with stratigraphic observations and the results are consistent with a persistent continental ice volume throughout the Late to Middle Jurassic and Cretaceous. In general, they compare well with the Arabian Plate Maximum Flooding Surfaces and the Cretaceous and Jurassic stage boundaries, within the limits of the recognized stratigraphic time scales. We used simple Parametric Forward Models (PFMs) for modeling changes in sea level, subsidence, and sedimentation and noted that PFMs can be applied to other tasks. The results will provide for rapid, cost-effective forward modeling on tasks such as reservoir characterization and flow simulation.

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Ivanova, Daria. "Cadosinidae Wanner, 1940 and Stomiosphaeridae Wanner, 1940 (Incertae sedis) from the Upper Jurassic of the Central Forebalkan, Bulgaria." Geologica Balcanica 24, no. 6 (December 30, 1994): 85–102. http://dx.doi.org/10.52321/geolbalc.24.6.85.

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Representatives of the Incertae sedis group have been studied from Upper Jurassic sequences in the Central Forebalkan. Their taxonomy and stratigraphic range are objects of this paper. Within the stratigraphic sequence of Lower Oxfordian to Upper Tithonian the limestones of the Javorec, Ginci, Gložene and Neškovci Formations are investigated. This paper is a first attempt for careful study of this important for the Upper Jurassic stratigraphy group. 16 species, belonging to 7 genera have been described. They are related to two families: Cadosinidae Wanner, 1940 and Stomiospaeridae Wanner, 1940.

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Piasecki, Stefan, John H. Callomon, and Lars Stemmerik. "Jurassic dinoflagellate cyst stratigraphy of Store Koldewey, North-East Greenland." Geological Survey of Denmark and Greenland (GEUS) Bulletin 5 (November 1, 2004): 99–112. http://dx.doi.org/10.34194/geusb.v5.4810.

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The Jurassic of Store Koldewey comprises a Middle Jurassic succession towards the south and an Upper Jurassic succession towards the north. Both successions onlap crystalline basement and coarse sediments dominate. Three main lithostratigraphical units are recognised: the Pelion Formation, including the Spath Plateau Member, the Payer Dal Formation and the Bernbjerg Formation. Rich marine macrofaunas include Boreal ammonites and the successions are dated as Late Bathonian – Early Callovian and Late Oxfordian – Early Kimmeridgian on the basis of new collections combined with material in earlier collections. Fine-grained horizons and units have been analysed for dinoflagellate cysts and the stratigraphy of the diverse and well-preserved flora has been integrated with the Boreal ammonite stratigraphy. The dinoflagellate floras correlate with contemporaneous floras from Milne Land, Jameson Land and Hold with Hope farther to the south in East Greenland, and with Peary Land in North Greenland and Svalbard towards the north. The Middle Jurassic flora shows local variations in East Greenland whereas the Upper Jurassic flora gradually changes northwards in East Greenland. A Boreal flora occurs in Peary Land and Svalbard. The characteristic and stratigraphically important species Perisseiasphaeridium pannosum and Oligosphaeridium patulum have their northernmost occurrence on Store Koldewey, whereas Taeniophora iunctispina and Adnatosphaeridium sp. extend as far north as Peary Land. Assemblages of dinoflagellate cysts are used to characterise significant regional flooding events and extensive sequence stratigraphic units.

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Stemmerik, Lars. "The Jurassic of North-East Greenland." Geological Survey of Denmark and Greenland (GEUS) Bulletin 5 (November 1, 2004): 1–7. http://dx.doi.org/10.34194/geusb.v5.4799.

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The Jurassic rift succession of East Greenland has been intensely studied over the last 25 years, particularly within the main outcrop areas of Jameson Land and Wollaston Forland. The more isolated and poorly known outcrops on Traill Ø, Hold with Hope, Hochstetter Forland and Store Koldewey were investigated in the late 1980s and mid-1990s in order to develop a better regional understanding of the Jurassic in eastern Greenland.This collection of seven papers focuses on stratigraphic and depositional aspects of the Jurassic at these localities. Comprehensive descriptions of the Jurassic on Hold with Hope and south-eastern Traill Ø are accompanied by papers covering fluvial deposits and new ammonite collections from the Middle Jurassic of Traill Ø. The bulletin is concluded by studies of the dinoflagellate cyst stratigraphy of the Middle and Upper Jurassic of Hold with Hope, Hochstetter Forland and Store Koldewey.

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Rahman, Mat Niza Bin Abdul. "Jurassic-Cretaceous Stratigraphy of Malaysia." Open Journal of Geology 09, no. 10 (2019): 668–70. http://dx.doi.org/10.4236/ojg.2019.910070.

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Ager, Derek V. "Brachiopod stratigraphy in the Jurassic." Geobios 27 (December 1994): 57–68. http://dx.doi.org/10.1016/s0016-6995(94)80125-8.

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Michalík, Jozef, Daniela Reháková, Eva Halásová, and Otília Lintnerová. "The Brodno section — a potential regional stratotype of the Jurassic/Cretaceous boundary (Western Carpathians)." Geologica Carpathica 60, no. 3 (June 1, 2009): 213–32. http://dx.doi.org/10.2478/v10096-009-0015-2.

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The Brodno section — a potential regional stratotype of the Jurassic/Cretaceous boundary (Western Carpathians) Compared to coeval successions from the Carpathians, the continuous Jurassic-Cretaceous (J/K) pelagic limestone succession of the Brodno section offers the best possibility to document the J/K passage in a wide area. This section comprises a complete calpionellid, and nannofossil stratigraphic record, that supports the older paleomagnetic data. Moreover, the sequence stratigraphy and stable isotope (δ18O, δ13C) data gave important results, too, enabling comparison with known key sections from the Mediterranean Tethys area.

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Morton, Nicol. "The International Subcommission on Jurassic Stratigraphy." Proceedings of the Geologists' Association 119, no. 1 (January 2008): 97–103. http://dx.doi.org/10.1016/s0016-7878(08)80261-1.

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Al-Husseini, Moujahed, and Robley K. Matthews. "STRATIGRAPHIC NOTE: Jurassic-Cretaceous Arabian orbital stratigraphy: The AROS-JK Chart." GeoArabia 13, no. 1 (January 1, 2008): 89–94. http://dx.doi.org/10.2113/geoarabia130189.

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Piasecki, Stefan, Michael Larsen, Jens Therkelsen, and Henrik Vosgerau. "Jurassic dinoflagellate cyst stratigraphy of Hold with Hope, North-East Greenland." Geological Survey of Denmark and Greenland (GEUS) Bulletin 5 (November 1, 2004): 73–88. http://dx.doi.org/10.34194/geusb.v5.4808.

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Dinoflagellate cysts of the Middle–Upper Jurassic succession on northern Hold with Hope have been studied in order to establish a biostratigraphic framework and to date the succession. The Pelion Formation is characterised by abundant Chytroeisphaeridia hyalina and Sentusidinium spp., with some Ctenidodinium thulium and Paragonyaulacysta retiphragmata in the lower part. Mendicodinium groenlandicum appears higher in the formation followed by Trichodinium scarburghense in the upper part. The succeeding Payer Dal Formation contains Scriniodinium crystallinum, Rigaudella aemula and Leptodinium subtile in the lower part and Dingodinium jurassicum and Prolixosphaeridium granulosum in the uppermost part. The Bernbjerg Formation contains abundant Sirmiodinium grossii and Gonyaulacysta jurassica. Adnatospahaeridium sp., Cribroperidinium granuligerum, Glossodinium cf. dimorphum and Scriniodinium irregulare appear in the lower part of the formation, followed by Avellodinium spp. in the highest part. The dinoflagellate cyst assemblages in the Pelion Formation indicate an Early–Late Callovian age (C. apertum – P. athleta Chronozones). This is supported by ammonites in the lower part of the formation, which refer to the C. apertum and P. koenigi Chronozones. A significant hiatus, from Late Callovian to Middle Oxfordian, is present between the Pelion Formation and the overlying Payer Dal Formation. The age of the Payer Dal Formation is Middle Oxfordian to earliest Late Oxfordian (C. tenuiserratum – A. glosense Chronozones). The Payer Dal Formation is conformably overlain by the Bernbjerg Formation of Late Oxfordian to possibly earliest Kimmeridgian age (A. glosense – P. baylei Chronozones). The A. glosense Chronozone is also documented by abundant ammonites in the lowermost part of the formation.

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Schroot, B. M. "Structural development of the Dutch Central Graben." Danmarks Geologiske Undersøgelse Serie B 16 (December 31, 1991): 32–35. http://dx.doi.org/10.34194/serieb.v16.7090.

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After Heybroek (1975) described the structure of the Dutch Central North Sea Graben and NAM and RGD (1980) published a stratigraphic nomenclature of the Netherlands containing a stratigraphic model for the Jurassic sediments, further work continued, both within the industry and the Geological Survey. Because Herngreen and Wong (1989) set up a revised stratigraphy for the Late Jurassic of the Central Graben and neighbouring areas, it was felt necessary to have a closer look at the structural geology of the Central Graben and to review its hydrocarbon potential. The results of this study have been reported by Wong et al. (1989). This work just about coincided with an increased interest of the industry in the south-eastern extension of the Graben because of the Dutch seventh round of exploration licenses.

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Ghalandari, Zohreh, Mohammad Vahidinia, and Seyyed Reza Mousavi-Harami. "Jurassic Biostratigraphy in the Persian Gulf, South of Iran." Micropaleontology 65, no. 5 (2019): 449–58. http://dx.doi.org/10.47894/mpal.65.5.05.

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The Neyriz, Surmeh and Hith Formations outcrop in the Persian Gulf area. Assemblages of benthic foraminifera and green algae were studied in 789 meters from these formations in the onshore middle part of the Persian Gulf, South of Iran. These formations consist of grey shales, dolomite, limestone and anhydrite. The Neyriz andHith formations are barren of fossils and the age of Neyriz Formation is Early Jurassic and the age of Hith Formation is Late Jurassic (Tithonian) based on stratigraphy. In the Surmeh Formation 18 genera and 17 species of benthic foraminifera, 5 genera and 3 species of algae, one genus of bivalve and one genus of crinoid have been determined. Five biozones are defined based on the microfossil distribution, and consist of the Lithiotis Range zone, Pfenderina Range zone, Trocholina palastinensis-Trocholina Assemblage zone, Kurnubia jurassica Interval zone and the Clypeina jurassica zone. Diagnostic larger benthic foraminifera indicate a Toarcian to Tithonian age for the Surmeh Formation in this part of the Persian Gulf Basin.

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Li, Jing Zhe, Jing Liang Zhang, Yong Yuan, Peng Hui Zhang, Cun Lei Li, Zhong Qin Luo, Lei Qin, Fang Ding, Xue Li, and Yan Li. "Sequence Stratigraphy of Jurassic Succession in Central Junggar Basin, China." Advanced Materials Research 734-737 (August 2013): 440–43. http://dx.doi.org/10.4028/www.scientific.net/amr.734-737.440.

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Sequence stratigraphic features of the Jurassic succession in Central Junggar Basin were investigated by integrating multiple materials including cores, well and seismic data. Due to their unique formation mechanism, sequences of the target interval were analyzed with a binary systems tract mode (each complete sequence contains a transgressive systems tract and a highstand systems tract) rather than the traditional one. Basic principles and analytical methods of high-resolution sequence stratigraphy were also applied to this research. By adopting cyclic correlation and hierarchical control techniques, eight sequences (Sq1-Sq8) were identified in the target interval. Especially, coal seams are of great significance in the sequence identification and they were considered to be closely relevant to maximum flooding surfaces (mfs).

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Gradstein, Felix, Anna Waskowska, and Larisa Glinskikh. "The First 40 Million Years of Planktonic Foraminifera." Geosciences 11, no. 2 (February 13, 2021): 85. http://dx.doi.org/10.3390/geosciences11020085.

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We provide a biochronology of Jurassic planktonic foramininfera, using first order linkage to ammonite and nannofossil stratigraphy and geochronology. This enigmatic and understudied group of microfossils occurred from middle Toarcian through Tithonian time, from ~180 to ~143 Ma; its origin is unknown. There are three genera: Globuligerina, Conoglobigerina and Petaloglobigerina. The genus Globuligerina, with a smooth to pustulose test surface texture appeared in Toarcian (late Early Jurassic) and Conoglobigerina, with a rough reticulate test surface texture in Oxfordian (early Late Jurassic) time. The genus Petaloglobigerina, having a petaloid last whorl with one or more claviform and twisted chambers evolved in early Kimmeridgian time from Globuligerina balakhmatovae. Biochronologic events for Jurassic planktonic foraminifera are most like First Common Appearance or Last Common Appearance events. The very first or very last appearance levels of taxa are not easily sampled and detected. We recognize stratigraphic events from eleven species across four postulated evolutionary lineages, calibrated to Geologic Time Scale 2020. A faunal change, which is not well documented led to the survival of only one taxon, most likely Gobuligerina oxfordiana in the Tithonian.

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Al-Husseini, Moujahed, and Robley K. Matthews. "Stratigraphic Note: Orbital calibration of the Arabian Jurassic second-order sequence stratigraphy." GeoArabia 11, no. 3 (July 1, 2006): 161–70. http://dx.doi.org/10.2113/geoarabia1103161.

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Labutis, V. R., A. D. Ruddock, and A. P. C. alcraft. "STRATIGRAPHY OF THE SOUTHERN SAHUL PLATFORM." APPEA Journal 38, no. 1 (1998): 115. http://dx.doi.org/10.1071/aj97006.

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This study of the southern Sahul Platform area in the Zone of Cooperation is based on the identification of depositional sequences, their distribution and relationship to structuring events in order to predict the locations of favourable combinations of source, seal and reservoir facies with increased confidence. A sequence stratigraphic approach integrating well logs, palynology and seismic data was used to identify and map significant seismic horizons such as the Aptian and Tithonian unconformities.Early to Middle Jurassic sediments were deposited in a broad, northeast-southwest oriented sag basin with a northeastward sediment transport direction. Depositional environments range from non-marine to marginal marine in the Plover Formation to the shallow marine sediments of the Elang Formation. The Elang Formation, comprising two depositional sequences, represents the last of the sediments deposited before the Breakup Unconformity. These formations comprise the dominant reservoir facies, containing a number of oil and gas discoveries. Porosity degradation occurs in Jurassic reservoirs below 3,360 m.The Callovian Breakup Unconformity resulted in the initiation of the narrow, confined depocentres of the Sahul Syncline, Malita Graben and a series of east-west troughs. The Sahul Platform and Londonderry High comprise the flanks of these depocentres but were originally located within the depocentre of the Early to Middle Jurassic sag basin. The Flamingo Syncline is a younger feature developed in the Albian.Late Jurassic and Early Cretaceous sediments are confined mainly to the Sahul Syncline and Malita Graben and are absent or represented by thin, condensed sections on the flanking highs. The condensed sections on horst blocks are a result of sediment bypass rather than considerable erosion. Reservoir facies of Tithonian-Berriasian age are interpreted to occur within east-west troughs constituting another reservoir section apart from the Bathonian-Callovian sediments. Wells distant from the Sahul Syncline and Malita Graben, have encountered hydrocarbons, indicating that the area contains mature source rocks, capable of charging traps away from the immediate vicinity of the depocentres.

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Wierzbowski, Hubert, Robert Anczkiewicz, Jacek Pawlak, Mikhail A. Rogov, and Anton B. Kuznetsov. "Revised Middle–Upper Jurassic strontium isotope stratigraphy." Chemical Geology 466 (September 2017): 239–55. http://dx.doi.org/10.1016/j.chemgeo.2017.06.015.

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Huang, Diying. "Jurassic integrative stratigraphy and timescale of China." Science China Earth Sciences 62, no. 1 (October 19, 2018): 223–55. http://dx.doi.org/10.1007/s11430-017-9268-7.

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Lucas, Spencer G., and Orin J. Anderson. "Jurassic stratigraphy and correlation in New Mexico." New Mexico Geology 20, no. 4 (1998): 97–104. http://dx.doi.org/10.58799/nmg-v20n4.97.

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Surlyk, Finn, and Jon R. Ineson. "The Jurassic of Denmark and Greenland: key elements in the reconstruction of the North Atlantic Jurassic rift system." Geological Survey of Denmark and Greenland (GEUS) Bulletin 1 (October 28, 2003): 9–20. http://dx.doi.org/10.34194/geusb.v1.4644.

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The Jurassic succession of Denmark is largely confined to the subsurface with the exception of exposures on the island of Bornholm in the Baltic Sea. In East Greenland, in contrast, the Jurassic is extensively exposed. Comparison of basin evolution in the two regions, which now occur on two separate plates, thus relies on highly different datasets. It is possible nevertheless to construct an integrated picture allowing testing of hypotheses concerning basin evolution, regional uplift, onset and climax of rifting, relative versus eustatic sea-level changes and sequence stratigraphic subdivision and correlation. On a smaller scale, it is possible to compare the signatures of sequence stratigraphic surfaces as seen on well logs, in cores and at outcrop and of sequences recognised and defined on the basis of very different data types. Breakdown of the successions into tectonostratigraphic megasequences highlights the high degree of similarity in overall basin evolution and tectonic style. An important difference, however, lies in the timing. Major events such as late Early – Middle Jurassic uplift, followed by onset of rifting, basin reorganisation and rift climax were delayed in East Greenland relative to the Danish region. This has important implications both for regional reconstructions of the rift system and for the understanding and testing of classical sequence stratigraphic concepts involving eustatic versus tectonic controls of basin evolution and stratigraphy.

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Al-Husseini, Moujahed I. "Jurassic Sequence Stratigraphy of the Western and Southern Arabian Gulf." GeoArabia 2, no. 4 (October 1, 1997): 361–82. http://dx.doi.org/10.2113/geoarabia0204361.

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ABSTRACT The Jurassic sequence stratigraphic scheme for Central Saudi Arabia is extrapolated to the formations of the western and southern Arabian Gulf region resulting in a tentative chronostratigraphic framework. The framework is tentaively constrained as follows: (1) Upper Triassic-?Lower Jurassic continental clastics (Minjur and equivalents) and the subsequent pre-Toarcian unconformity indicate regional erosion and non-deposition over the Arabian platform. (2) A Toarcian sequence (Marrat and equivalents) provides a basal Jurassic regional datum, except in Oman. (3) The late Toarcian and Aalenian correspond to a substantial sea- level lowstand and a regional depositional hiatus. (4) The Middle Jurassic Dhruma Formation corresponds to four different sequences with a major intervening hiatus. The Upper Dhruma Member, together with the Tuwaiq Mountain form the topmost sequence. The correlation between the Dhruma, Tuwaiq Mountain, Hanifa and Jubaila formations, to their equivalents in other Arabian Gulf countries, requires clearer definitions. (5) The Arab and Hith Anhydrite formations are Tithonian based on their sequence assignment, while the Sulaiy Formation is Berriasian and straddles the Jurassic-Cretaceous boundary. (6) The four Tithonian Arab carbonates may have been deposited as transgressive and early highstand deposits. The Tithonian Arab, Gotnia and Hith anhydrites may be late highstand deposits which overstep inland “salinas” (Gotnia and western Rub’ Al-Khali). Each carbonate and overlying anhydrite sequence appear to correspond to a complete third-order cycle. (7) The equivalents to the Kimmeridgian Jubaila Formation and Tithonian Arab carbonates are absent by non-deposition in Kuwait. In Oman, the Arab and Hith Anhydrite formations are absent by erosion. (8) The Tithonian Hith Anhydrite provides a final Jurassic regional, stratigraphic datum, except in Oman and eastern United Arab Emirates.

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Graversen, Ole. "Upper Triassic – Cretaceous stratigraphy and structural inversion off-shore SW Bornholm, Tornquist Zone, Denmark." Bulletin of the Geological Society of Denmark 51 (December 15, 2004): 111–36. http://dx.doi.org/10.37570/bgsd-2004-51-08.

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Geological interpretations by various authors of exploration reflection seismic data offshore SW Bornholm show good agreement for the Rønne Graben. However, major differences exist regarding the Mesozoic stratigraphy and structural development of the Arnager-Darlowo Block and the Risebæk Graben. Major problems relate to the distribution and structural position of the Jurassic, and interpretation of inversion structures in the Rønne and Kolobrzeg grabens along the Arnager Block. In addition to the Pernille-1 and Stina-1 wells that document the stratigraphy of the Rønne and Kolobrzeg graben sections, the bedrock geology along the south coast of Bornholm is discussed.The Jurassic is established as a major constituent of the Arnager Block above the Risebæk Graben, in contrast to previous interpretations. The revised stratigraphy and reinterpretation of the inversion zones help to establish a new interval of basin inversion during the Jurassic – Early Cretaceous priorto the Late Cretaceous inversion. Analysis of the Late Cretaceous inversion across the Rønne Graben supports the proposed revision of the stratigraphy and leads to a new model. Previous interpreta-tions invoked a major uplift of the graben along a reverse fault at the eastern border of the Rønne Graben. In the new model, Late Cretaceous inversion across the Rønne Graben is associated withtilting of the graben during differential subsidence/uplift of the Skurup Platform and the Arnager Block, whereas reverse faulting was limited.

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Al-Suwaidi, Ahmed S., and Sabah K. Aziz. "Sequence stratigraphy of Oxfordian and Kimmeridgian shelf carbonate reservoirs, offshore Abu Dhabi." GeoArabia 7, no. 1 (January 1, 2002): 31–44. http://dx.doi.org/10.2113/geoarabia070131.

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ABSTRACT Carbonate reservoirs on the eastern flank of the Oxfordian-Kimmeridgian intrashelf basin in offshore Abu Dhabi had received little attention until commercial oil accumulations in structural traps were discovered in the late 1980s and early 1990s. In order to clarify the geometric and chronostratigraphic relationships of the Oxfordian-Kimmeridgian reservoirs, a multidisciplinary study (seismic, lithobiofacies, geochemistry, strontium isotope dating, and well-log data) was used to develop a sequence stratigraphic model. After deposition of the Callovian upper Araej Formation, a differentiated carbonate platform was established in the early Oxfordian in offshore and western onshore Abu Dhabi. Tectonic subsidence coupled with sea-level fluctuations controlled the geometry, deposition, and distribution of the lithofacies. These ranged from organic-rich, limy mudstones in the basinal area, to porous and permeable bioclastic packstones, grainstones, and dolomites in shallow waters on the eastern flank of the intrashelf basin. The upper Kimmeridgian Arab-D Member of the Arab Formation overlies the basinal deposits. Three third-order Depositional Sequences were identified in the offshore area. They are named according to their contained Maximum Flooding Surface; a fourth sequence is an intermediate unnamed Depositional Wedge. Depositional Sequence Jurassic 50 is of Oxfordian age and was deposited during transgressive and highstand periods. The lower Kimmeridgian Depositional Sequence Jurassic 60 is a well-defined lowstand system tract overlain by short-lived transgressive and highstand system tracts. Overlying Depositional Sequence Jurassic 60 is the Depositional Wedge. Finally, Depositional Sequence Jurassic 70 consists of transgressive and highstand system tracts developed on an undifferentiated platform that had localized depressions in the west. The best reservoir developments are in highstand bioclastic packstones and grainstones below the type-1 sequence boundaries that cap Depositional Sequences Jurassic 50 and Jurassic 60. The reservoir units have porosities greater than 20 percent and permeabilities of more than 1,000 milliDarcies. The basinal facies of Depositional Sequence Jurassic 50 have the best source-rock potential in the intrashelf basin.

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Andsbjerg, Jan, and Karen Dybkjær. "Sequence stratigraphy of the Jurassic of the Danish Central Graben." Geological Survey of Denmark and Greenland (GEUS) Bulletin 1 (October 28, 2003): 265–300. http://dx.doi.org/10.34194/geusb.v1.4675.

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A sequence stratigraphic framework is established for the Jurassic of the Danish Central Graben based primarily on petrophysical log data, core sedimentology and biostratigraphic data from about 50 wells. Regional seismic lines are used to assist in the correlation of some wells and in the construction of isochore maps. In the Lower Jurassic (Hettangian–Pliensbachian) succession, five sequences have been identified. The Middle Jurassic is subdivided into four sequences that together span the uppermost Aalenian/lowermost Bajocian to the Callovian. In the Upper Jurassic, better well coverage permits greater stratigraphic resolution, and 11 sequences are identified and mapped. On the basis of the sequence stratigraphic correlation and the construction of isochore maps for individual sequences, the Jurassic basin history of the Danish Central Graben can be subdivided into seven discrete phases: (1) Shallow marine and offshore sediments deposited in a prerift basin extending from the North Sea to the Fennoscandian Border Zone (Hettangian–Pliensbachian). (2) Uplift and erosion in association with a Toarcian–Aalenian North Sea doming event. A major hiatus represents this phase in the study area. (3) Terrestrial and marginal marine sedimentation during initial rifting (latest Aalenian/earliest Bajocian – Late Callovian). (4) Early Oxfordian – Early Kimmeridgian transgression during and after a rift pulse. The sedimentary environment changed from coastal plain and marginal marine to fully marine. (5) Regression associated with a cessation or slowing of subsidence during a structural rearrangement that took place in the Late Kimmeridgian during a break in the main rift climax. Shallow to marginal marine sandstones were deposited above an erosion surface of regional extent. (6) Deep-water mudstones deposited in a composite graben with high subsidence rates related to rift pulses (latest Late Kimmeridgian – middle Middle Volgian). (7) Deposition of organic-rich mudstones and turbidite sandstones during the late Middle Volgian – Early Ryazanian. The main basin shallowed, became more symmetrical and experienced a decreasing rate of subsidence, recording the onset of the post-rift stage. A relative sea-level curve is constructed for the Middle–Late Jurassic. It shows close similarity to published eustatic (global) and relative (North Atlantic area) sea-level curves in the latest Bathonian – late Early Kimmeridgian, but differs in the Late Kimmeridgian – Middle Volgian interval, probably due to the high rate of subsidence in the study area.

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Meesook, A., and J. A. Grant‐Mackie. "Upper Jurassic stratigraphy, south Kawhia region, New Zealand." New Zealand Journal of Geology and Geophysics 38, no. 3 (June 1995): 361–73. http://dx.doi.org/10.1080/00288306.1995.9514663.

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Tchoumatchenco, Platon. "Jurassic outcrop depositional sequence stratigraphy in western Bulgaria." Geologica Balcanica 32, no. 2-4 (December 30, 2002): 49–54. http://dx.doi.org/10.52321/geolbalc.32.2-4.49.

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Wang, Ping Li, Da Wei Lv, Hai Yan Liu, Xue Zheng, and Yu Lin Lv. "Migration Law of Mesozoic Qaidam Basin Depocenters." Advanced Materials Research 524-527 (May 2012): 63–66. http://dx.doi.org/10.4028/www.scientific.net/amr.524-527.63.

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According to stratigraphy and distribution features of the Qaidam Basin, and further the formation and migration of it’s depocenters, it is considered that the Middle-Upper Triassic were mainly sags scattered among the Qilian Mountains, the Alabasitao Mountains and the Kunlun Mountains; the Early Jurassic depocenters were located mainly in Lenghu depression and Yiliping sag at the northwest of the basin; several Middle Jurassic depocenters distributed from the northwest to the southeast of the basin along Sertengshan-Yuqia near front of the Qilian mountains; the Late Jurassic-Cretaceous depocenters moved east and south. The basin had been larger since the Middle Jurassic, and the sedimentary facies changed from semideep-deep lacustrine of the Early-Middle Jurassic to near-source variegated fluvial-lacustrine of the Late Jurassic and brownish red lakeshore of the Early Cretaceous.

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Daneshian, Jahanbakhsh, Zahra Saleh, Rudy Swennen, and Hossein Mosaddegh. "Porosity development in central Alborz Upper Jurassic deposits (N-Iran): sequence stratigraphy, diagenesis and mechanical stratigraphy." Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen 300, no. 2 (May 28, 2021): 117–43. http://dx.doi.org/10.1127/njgpa/2021/0975.

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Smith, P. L., J. M. Beyers, E. S. Carter, G. K. Jakobs, J. Pálfy, E. Pessagno, and H. W. Tipper. "5. North America 5.1 Lower Jurassic." Newsletters on Stratigraphy 31, no. 1 (September 15, 1994): 33–70. http://dx.doi.org/10.1127/nos/31/1994/33.

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Herngreen, G. F. W., Th Lissenberg, and L. J. White. "Biostratigraphy of the Jurassic strata in the Dutch Central North Sea Graben." Danmarks Geologiske Undersøgelse Serie B 16 (December 31, 1991): 16. http://dx.doi.org/10.34194/serieb.v16.7085.

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This contribution presents an extended abstract intended for the proceedings of the symposium: The Jurassic in the southern Central Graben, Hørsholm (Denmark) June 15-16, 1989. The full text entitled "Dinoflagellate, sporomorph, and micropaleontological zonation of Callovian to Ryazanian strata in the Central North Sea Graben, The Netherlands" has been published in the proceedings of the 2nd International Symposium on Jurassic Stratigraphy, Lisbon 1989, p. 745-762.

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Qayyum, Farrukh, Octavian Catuneanu, and Crépin Eric Bouanga. "Sequence stratigraphy of a mixed siliciclastic-carbonate setting, Scotian Shelf, Canada." Interpretation 3, no. 2 (May 1, 2015): SN21—SN37. http://dx.doi.org/10.1190/int-2014-0129.1.

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During the Jurassic Period, a large-scale carbonate bank (Abenaki Formation) and a siliciclastic (Sable) delta coexisted in North America. Conventionally, carbonate systems (in situ) are separated from siliciclastic systems (transported) because of their contrasting origin. However, we developed a case study to show that the basic principles of sequence stratigraphy remain applicable. We integrated the results obtained from a regional 2D study and a detailed follow-up study using 3D seismic data of the Scotian Shelf, Canada. The results were integrated with the prepared Wheeler diagrams, and a unified sequence stratigraphic framework was proposed. We determined that two second-order sequences were developed on a larger scale during the Jurassic Period. The first sequence developed during the transition from a ramp to rimmed margin. The second sequence developed during the evolution from a rimmed to ramp margin. These sequences formed a distinct stratigraphic style throughout the Scotian Shelf. The siliciclastic supply varied from the northeast to the southwest depending on the studied site; however, the regions close to the siliciclastic supply contained well-defined clinoform patterns. The topsets of such clinoforms were mostly eroded. Their directions were also found to be different than the carbonate-related clinoform geometries. Most of the carbonates were developed; as such, they kept up and prograded toward a backreef margin during the rimming stages. The second-order sequences were further subdivided into four third-order sequences. These were studied using the 3D seismic data and were found to contain several barrier reefs that could have stratigraphic exploration potential in the Penobscot area.

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Parrish, Judith Totman, Fred Peterson, and Christine E. Turner. "Jurassic “savannah”—plant taphonomy and climate of the Morrison Formation (Upper Jurassic, Western USA)." Sedimentary Geology 167, no. 3-4 (May 2004): 137–62. http://dx.doi.org/10.1016/j.sedgeo.2004.01.004.

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Jovanovic, Velimir, Ivana Carevic, Dragana Vuskovic, and Khalil Abad. "Review and protection possibilities of some trans-border (East Serbia-West Bulgaria) stratigraphic/palaeontological geosites." Glasnik Srpskog geografskog drustva 92, no. 1 (2012): 171–84. http://dx.doi.org/10.2298/gsgd1201171j.

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Stratigraphic/palaeontological geosites of Stara Planina Mountain in east Serbia are well developed in the area of Serbian/Bulgarian state border, where with this occassion, three sections of exeptional geological and scientific interest are selected: Jelovica, Rosomac and Senokos. These geosites represent the important localities for study of Triassic and Jurassic terrigene-carbonate deposits, for which the scientific value from the domains of palaeontology, stratigraphy and sedimentology is widely known. The aim of this work is to represent the main scientific arguments for inventory and protection of detached transborder geological sites that are unique according to their composition and content.

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Eltom, Hassan, Osman Abdullatif, Mohammed Makkawi, and Asaad Abdulraziq. "Characterizing and modeling the Upper Jurassic Arab-D reservoir using outcrop data from Central Saudi Arabia." GeoArabia 19, no. 2 (April 1, 2014): 53–84. http://dx.doi.org/10.2113/geoarabia190253.

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ABSTRACT Outcrop analogs are used to improve the characterization of reservoir stratigraphy, to understand subsurface facies architecture and heterogeneity, and to overcome the limitations associated with large inter-well spacing within individual oil fields. This study characterized and modeled outcropping strata equivalent to the Upper Jurassic Arab-D carbonate reservoir in Central Saudi Arabia. The study presents qualitative and quantitative sedimentological and petrographic descriptions of lithofacies associations and interprets them within a high-order stratigraphic framework using geostatistical modeling, spectral gamma-ray, geochemistry, petrography and micropaleontology. The sedimentological studies revealed three lithofacies associations, which are interpreted as a gentle slope platform depositional environment comprising nine high-frequency sequences. The biocomponents of the study area show a lower degree of diversity than the subsurface Arab-D reservoir; however, some key biofacies are present and provide indications of the nature of the paleoenvironments. The geochemical results show a strong correlation between the major and trace elements and the reservoir facies, and suggest that the concentrations of elements and their corresponding spectral gamma-ray logs follow the same general upward-shoaling pattern. The 3-D geocellular model captures small-scale reservoir variability, which is reflected in the petrophysical data distribution in the model. This investigation increases the understanding of the stratigraphy of the Arab-D reservoir and provides a general framework for zonation, layering, and lateral stratigraphic correlations.

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Zepeda-Martínez, Mildred, Michelangelo Martini, Luigi A. Solari, and Claudia C. Mendoza-Rosales. "Reconstructing the tectono-sedimentary evolution of the Early–Middle Jurassic Tlaxiaco Basin in southern Mexico: New insights into the crustal attenuation history of southern North America during Pangea breakup." Geosphere 17, no. 4 (June 21, 2021): 1294–317. http://dx.doi.org/10.1130/ges02309.1.

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Abstract During Pangea breakup, several Jurassic extensional to transtensional basins were developed all around the world. The boundaries of these basins are major structures that accommodated continental extension during Jurassic time. Therefore, reconstructing the geometry of Jurassic basins is a key factor in identifying the major faults that produced continental attenuation during Pangea breakup. We reconstruct the tectono-sedimentary evolution of the Jurassic Tlaxiaco Basin in southern Mexico using sedimentologic, petrographic, and U-Pb geochronologic data. We show that the northern boundary of the Tlaxiaco Basin was an area of high relief composed of the Paleozoic Acatlán Complex, which was drained to the south by a set of alluvial fans. The WNW-trending Salado River–Axutla fault is exposed directly to the north of the northernmost fan exposures, and it is interpreted as the Jurassic structure that controlled the tectono-sedimentary evolution of the Tlaxiaco Basin at its northern boundary. The eastern boundary is represented by a topographic high composed of the Proterozoic Oaxacan Complex, which was exhumed along the NNW-trending Caltepec fault and was drained to the west by a major meandering river called the Tlaxiaco River. Data presented in this work suggest that continental extension during Pangea breakup was accommodated in Mexico not only by NNW-trending faults associated with the development of the Tamaulipas–Chiapas transform and the opening of the Gulf of Mexico, but also by WNW-trending structures. Our work offers a new perspective for future studies that aim to reconstruct the breakup evolution of western equatorial Pangea.

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Lipski, Paul. "TECTONIC SETTING, STRATIGRAPHY AND HYDROCARBON POTENTIAL OF THE BEDOUT SUB-BASIN, NORTH WEST SHELF." APPEA Journal 33, no. 1 (1993): 138. http://dx.doi.org/10.1071/aj92011.

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The tectonic and depositional histories of the Bedout Sub-basin are closely related to more widely explored areas of the southern North West Shelf, i.e. the Barrow and Dampier Sub-basins. The Mesozoic Bedout Sub-basin onlaps and overlies the Palaeozoic offshore Canning Basin sequence. Four distinct tectonic regimes characterised the Triassic, Early to Late Jurassic, Late Jurassic to Late Cretaceous, and Tertiary to present:During the Triassic, the Bedout Sub-basin was part of a broad intracratonic downwarp that also encompassed the Barrow, Dampier and Beagle Sub-basins. A thick sequence of Locker Shale and Upper and Lower Keraudren Formations (Mungaroo Formation equivalent) was deposited.During the Jurassic rifting phase, the Bedout Sub-basin was a subsiding rim basin, landward of the uplifted rift margin. Sedimentation was dominated by a thick sequence of fluviodeltaic to marginal marine deposits.In the post-break-up phase from the Callovian to latest Cretaceous, a transgressive regime resulted in deep open marine conditions with widespread claystone and minor carbonate deposition over the southern North West Shelf.Through the Tertiary to the present, shallow shelf conditions prevailed and sedimentation was dominated by a thick prograding carbonate wedge.Hydrocarbon source is provided by a thick sequence of Triassic Locker Shale and Lower Keraudren Formation. The Locker Shale is presently mature for hydrocarbon generation over most of the Bedout Sub-basin and has the potential to generate both oil and gas. The Lower Keraudren Formation is a mature source mainly for gas/condensate in deeper sections of the sub-basin. Jurassic marine claystones, which represent a prolific source in the Barrow and Dampier Sub-basins, are not present in the Bedout Sub-basin.Reservoir rocks exist in the Triassic and Jurassic sections. However, gentle Jurassic rim basin tectonic activity has resulted in minor faulting compared to the adjacent rift. This has limited migration pathways from Triassic source to Jurassic reservoirs. The primary reservoir objectives are sandstones of the Triassic Upper and Lower Keraudren Formations.Although large structural traps are uncommon, there is considerable potential to host large hydrocarbon accumulations in stratigraphic traps. A giant prospect involving the onlap of the Triassic sequence has been identified in the eastern Bedout Sub-basin. Pursuit of this play should accelerate exploration in this sparsely drilled area.

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Shaynoha, Ihor V., and Vasyl V. Karabyn. "Peculiarities of Stratigraphic Distribution and Paleoecology of Jurassic Bivalve Mollusks of the Pre-Сarpathian Foredeep." Journal of Geology, Geography and Geoecology 30, no. 4 (December 27, 2021): 718–28. http://dx.doi.org/10.15421/112166.

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Pre-Carpathian region is one of the oldest oil and gas producing regions of our country, which is attracting more and more attention of scientists. In the Outer zone of the Pre-Carpathian Foredeep, Jurassic deposits occur at considerable depths (up to 3,000 m), so we obtain almost all geological information about them exclusively during the study of core material selected during drilling. A comprehensive and detailed study of the Jurassic deposits of this zone during exploration drilling in the 1950s contributed to the discovery of the Kokhanivske and Sudovovyshnianske oil deposits and Rudkivske gas deposit, as well as a number of oil and gas manifestations. After that, the interest in the conditions of formation and stratification of Jurassic deposits increased. Researchers have begun to treat them as the promising objects for oil and gas exploration. Jurassic deposits in the Pre-Сarpathian Foredeep fill a single depression – the Stryi Jurassic deflection, covered by a thick layer of Cretaceous and Neogene rocks. The study of their geology and stratigraphy has acquired important applied and scientific significance, because stratigraphic research serves as a basis for clarifying the history of geological development of the region, performing tectonic constructions, reconstruction of paleogeographic and paleoecological conditions, comparison of productive horizons and specification of their stratigraphic position, search for new objects promising for hydrocarbons. Extremely rare finds of paleontological remains (which are not always well preserved) do not allow to unambiguously determining the age of the host rocks. It is still not always possible to clearly stratigraphically distinguish and correlate these rocks due to weak paleontological study and partial uncertainty in the interpretation of the geological structure of these strata. Despite the significant amount of research we have done, there are some debatable issues regarding the completeness of the section of these rocks and the presence of separate stratigraphic units in them. For many years, we have studied in detail and comprehensively bivalve mollusks found in the core of wells drilled in the Outer zone of the Pre-Carpathian Foredeep. As a result, the age of the host strata was specified and confirmed, as well as the thickness of individual stratigraphic units.

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Kadar, Adi P., Thomas De Keyser, Nilotpaul Neog, and Khalaf A. Karam. "Calcareous nannofossil zonation and sequence stratigraphy of the Jurassic System, onshore Kuwait." GeoArabia 20, no. 4 (October 1, 2015): 125–80. http://dx.doi.org/10.2113/geoarabia2004125.

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ABSTRACT This paper presents the calcareous nannofossil zonation of the Middle and Upper Jurassic of onshore Kuwait and formalizes current stratigraphic nomenclature. It also interprets the positions of the Jurassic Arabian Plate maximum flooding surfaces (MFS J10 to J110 of Sharland et al., 2001) and sequence boundaries in Kuwait, and correlates them to those in central Saudi Arabia outcrops. This study integrates data from about 400 core samples from 11 wells representing a nearly complete Middle to Upper Jurassic stratigraphic succession. Forty-two nannofossil species were identified using optical microscope techniques. The assemblage contains Tethyan nannofossil markers, which allow application of the Jurassic Tethyan nannofossil biozones. Six zones and five subzones, ranging in age from Middle Aalenian to Kimmeridgian, are established using first and last occurrence events of diagnostic calcareous nannofossil species. A chronostratigraphy of the studied formations is presented, using the revised formal stratigraphic nomenclature. The Marrat Formation is barren of nannofossils. Based on previous studies it is dated as Late Sinemurian–Early Aalenian and contains Middle Toarcian MFS J10. The overlying Dhruma Formation is Middle or Late Aalenian (Zone NJT 8c) or older, to Late Bajocian (Subzone NJT 10a), and contains Lower Bajocian MFS J20. The overlying Sargelu Formation consists of the Late Bajocian (Subzone NJT 10b) Sargelu-Dhruma Transition, and mostly barren Sargelu Limestone in which we place Lower Bathonian MFS J30 near its base. The lower part of the overlying Najmah Formation consists of the Najmah Shale, which is subdivided into three subunits: (1) barren Najmah-Sargelu Transition, (2) Late Bathonian to Middle Callovian (lower Zone NJT 12) Lower Najmah Shale, and (3) Middle Callovian to Middle Oxfordian (upper Zone NJT 12 to NJT 13b) Upper Najmah Shale. Middle Callovian MFS J40 and Middle Oxfordian MFS J50 are positioned near the base and top of the Upper Najmah Shale. The upper part of the Najmah Formation is represented by the Late Oxfordian (Subzone NJT 13b) Najmah Limestone, and is overlain by the Kimmeridgian (Zone NJT 14) Jubaila Formation. Early Kimmeridgian MFS J60 and Late Kimmeridgian MFS J70 are positioned near the base and top of the Jubaila Formation. The positions of Late Jurassic MFS J80, J90 and J100 are not constrained by our biostratigraphic data and are positioned in the Gotnia Formation. The Upper Tithonian MFS J110 and the Jurassic/Cretaceous boundary are positioned in the Makhul Formation.

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Nosova, N. V., E. I. Kostina, and E. V. Bugdaeva. "Pseudotorellia Florin from the Upper Jurassic–Lower Cretaceous of the Bureya Basin, Russian Far East." Stratigraphy and Geological Correlation 29, no. 4 (July 2021): 434–49. http://dx.doi.org/10.1134/s0869593821040031.

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Abstract The leaves of the genus Pseudotorellia from the Upper Jurassic–Lower Cretaceous of the Bureya Basin (Russian Far East) have been revised. The similarity of Pseudotorellia angustifolia Doludenko and P. longifolia Doludenko in the morphology and epidermal characters suggests that P. longifolia is a synonym of P. angustifolia. Leaves of this genus from the Bureya Basin previously assigned to P. ensiformis (Heer) Doludenko according to both morphological and epidermal characters are described as a new species P. doludenkoae sp. nov., since the type specimens of P.ensiformis from the Irkutsk Basin do not have preserved cuticles and their leaf epidermal characters are unknown. The epidermal characters of leaves described previously as Pseudotorellia pulchella and P. crassifolia have been studied for the first time. Since these species have similar morphological and epidermal characters, they are described as P. crassifolia, and its emended diagnosis is provided. The well-defined epidermal characters of Pseudotorellia allow us to reliably assign even cuticle fragments and dispersed cuticles to a particular species. This indicates a large stratigraphic potential of the Pseudotorellia species for the intrabasin and interregional stratigraphy of continental deposits, especially when studying the core material and coals, where the preservation of plant remains usually does not allow describing their morphology. The revision of all known occurrences of Pseudotorellia angustifolia makes it possible to discuss the place and time of the first appearance of this species and its subsequent distribution in space and time. Apparently, this species appeared in the Early Jurassic of Eastern Siberia (Kansk Basin). In the Middle Jurassic, its range expanded both to the northwest (Tomsk oblast and Yamal-Nenets Autonomous Okrug), where this species was preserved until the Late Jurassic, and to the east (Irkutsk oblast, Khabarovsk krai (Bureya Basin)), where it survived until the Early Cretaceous.

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Klikushin, V. G. "Late Jurassic crinoids from Sudak environs (Crimea)." Palaeontographica Abteilung A 238, no. 5-6 (September 22, 1995): 97–151. http://dx.doi.org/10.1127/pala/238/1995/97.

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Senowbari-Daryan, Baba, and George D. Stanley. "Lower Jurassic marine carbonate deposits in Central Peru: Stratigraphy and paleontology." Palaeontographica Abteilung A 233, no. 1-6 (November 22, 1994): 43–56. http://dx.doi.org/10.1127/pala/233/1994/43.

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Poulsen, N. E. "Upper Jurassic dinocyst stratigraphy in the Danish Central Trough." Danmarks Geologiske Undersøgelse Serie B 16 (December 31, 1991): 7–15. http://dx.doi.org/10.34194/serieb.v16.7084.

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The English dinocyst zonations established by Woollam and Riding (1983) and Riding and Thomas (1988), and the Danish-English zonations of Davey (1979, 1982), are unified for the Danish North Sea area and the subzones of the Endoscrinium luridum Zone are redefined. Two standard sections for the Upper Jurassic are described and correlations to five other wells in the Danish North Sea area are demonstrated.

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Elliot, D. H. "Stratigraphy of Jurassic pyroclastic rocks in the Transantarctic Mountains." Journal of African Earth Sciences 31, no. 1 (July 2000): 77–89. http://dx.doi.org/10.1016/s0899-5362(00)00074-9.

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Cope, John C. W. "A review of Raymond Casey’s contribution to Jurassic stratigraphy." Proceedings of the Geologists' Association 131, no. 3-4 (August 2020): 242–51. http://dx.doi.org/10.1016/j.pgeola.2019.03.001.

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Morton, Nicol. "Jurassic sequence stratigraphy in the Hebrides Basin, NW Scotland." Marine and Petroleum Geology 6, no. 3 (August 1989): 243–60. http://dx.doi.org/10.1016/0264-8172(89)90004-4.

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47

Busby, C. J., and E. Centeno-García. "The “Nazas Arc” is a continental rift province: Implications for Mesozoic tectonic reconstructions of the southwest Cordillera, U.S. and Mexico." Geosphere 18, no. 2 (February 17, 2022): 647–69. http://dx.doi.org/10.1130/ges02443.1.

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Abstract We reject the notion of a Jurassic continental arc in eastern Mexico, termed the “Nazas arc,” on geologic grounds. Instead, we propose that the Jurassic continental arc of the SW Cordilleran U.S. and northern Sonora, Mexico, passed southward into the oceanic realm and is represented by Jurassic arc volcanic and plutonic rocks that fringed the Mexican paleo-Pacific margin, which are currently found in the western Peninsular Ranges of southern California, USA, and Baja California, the Vizcaino Peninsula of Baja California, and western mainland Mexico. To show this, we present a summary of the geologic features of a continental arc, using the geology of the southern end of the Jurassic continental arc, in southern Arizona and northern Sonora. These features include multi-kilometer–thick sections of volcanic rock; large volcanic centers, including silicic calderas; major eruptive units that can be correlated for distances of 100 km or more; abundant, large plutonic suites; and continuity of these features for distances of hundreds of kilometers along the length of the continental arc. Then we show that the “Nazas arc” consists of scattered, small continental rift basins with thin (meters to tens of meters thick) volcanic sections at the base of clastic sections that are hundreds of meters thick. Plutonic rocks are entirely absent from the “Nazas arc,” despite the fact that post-Jurassic tectonic events should have exposed them if they existed. This paper also presents a tabulation of all published U-Pb zircon dates in the Jurassic continental arc of southern Arizona, USA, and northern Sonora (Table 1A), and in the “Nazas arc” of eastern Mexico (Table 1B), with ages, methods, the rock type dated, and notes on geologic relations. We use this to detail the abundance of thick, laterally extensive volcanic sections and large plutonic suites in a continental arc (the Jurassic arc of southern Arizona–northern Sonora), which contrasts sharply with the “Nazas arc.” The term “Nazas arc” has been in widespread usage for volcanic rocks in eastern Mexico for decades in many dozens of papers, and it is portrayed as a 2000-km-long, 250-km-wide belt that extends from Sonora through eastern Mexico to Chiapas. It has been misunderstood to form a subduction-related silicic large igneous province (SLIP), and it has been proposed that the Gulf of Mexico formed as a backarc basin behind the “Nazas arc.” The “Nazas arc” model also requires an east-dipping subduction zone under Mexico, and a separate west-dipping subduction zone under the oceanic arc rocks of western Mexico, which those models portray as an exotic arc, despite the presence of abundant detrital zircon from the Mexican margin. We urge workers to abandon the term “Nazas arc” and replace it with “Nazas rift province,” which represents continental rift basins formed during the breakup of Pangea.

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Piasecki, S., L. Stemmerik, J. D. Friderichsen, and A. K. Higgins. "Stratigraphy of the post-Caledonian sediments in the Germania Land area, North-East Greenland." Rapport Grønlands Geologiske Undersøgelse 162 (January 1, 1994): 177–84. http://dx.doi.org/10.34194/rapggu.v162.8260.

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Sediment outliers in North-East Greenland are briefly described and dated on the basis of macro- and microscopic plant fossils. Conglomerates and sandstones at Depotnæsset are probably of Late Carboniferous age based on the content of poorly preserved spores and pollen together with Stigmaria molds. Conglomerates, sandstones and coals from localities west of Germania Land are of Early to Middle Jurassic age based on poorly preserved fossil leaves and sporomorphs. The sedimentary facies and the fossil content of the Upper Carboniferous sediments suggest that the transition between the continental Carboniferous basins of East Greenland and the marine basins of North Greenland was situated north of 78°N. The maturity of the sporomorphs suggests that the Upper Carboniferous basins subsided by 1.5–2 km in Late Carboniferous to Middle Jurassic time, whereas subsidence of the Jurassic basins was negligible.

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HUNTER, M. A., and D. J. CANTRILL. "A new stratigraphy for the Latady Basin, Antarctic Peninsula: Part 2, Latady Group and basin evolution." Geological Magazine 143, no. 6 (September 28, 2006): 797–819. http://dx.doi.org/10.1017/s0016756806002603.

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Recent detailed mapping, section logging and an improved understanding of the geological evolution of the Antarctic Peninsula provide a robust framework for an improved lithostratigraphic subdivision of the Latady Basin, eastern Ellsworth Land. Within the Latady Basin we recognize two main groups: Ellsworth Land Volcanic Group and Latady Group. The focus of this paper is the Latady Group, which is formally subdivided into five formations: Anderson Formation, Witte Formation, Hauberg Mountains Formation, Cape Zumberge Formation and Nordsim Formation. Middle Jurassic, shallow marine deposits of the Anderson Formation are overlain by quiet anoxic deposits assigned to the Witte Formation. The start of the Late Jurassic is marked by the deposition of higher energy deposits of the Hauberg Mountains Formation, subdivided into three members (Long Ridge, Mount Hirman and Novocin members) that reflect varying lithological and environmental characteristics. Thermal subsidence during the latest Jurassic led to deposition of the basinal Cape Zumberge Formation, while uplift of an active continental arc along the Antarctic Peninsula led to deposition of the terrestrial Nordsim Formation in the latest Jurassic to earliest Cretaceous. The evolution of the Latady Basin reflects early extension during Gondwana break-up, from the Early Jurassic to earliest Cretaceous, and is consistent with a shift in the underlying forces driving extension in the Weddell Sea area from intracontinental rifting related to a mantle plume, to active margin forces in response to subduction.

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Mouterde, René. "Triassic/Jurassic boundary." Geobios 27 (December 1994): 745. http://dx.doi.org/10.1016/s0016-6995(94)80236-x.

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Journal articles on the topic 'Jurassic stratigraphy'

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