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Littérature scientifique sur le sujet « Early Mesozoic »

Auteur : Grafiati

Publié le 1 février 2025

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Articles de revues sur le sujet "Early Mesozoic"

1

Ash, Sidney. « The Early Mesozoic Land Flora of the Northern Hemisphere ». Notes for a Short Course : Studies in Geology 15 (1986) : 143–61. http://dx.doi.org/10.1017/s027116480000138x.

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In this chapter the, early Mesozoic land flora of the northern hemisphere is discussed briefly, and some of the subtle but significant evolutionary changes that took place during the time are summarized. Comments about climatic implications of the fossils are also included as well as comments about the environments of deposition of the fossils. Representative plant megafossils of the Early Mesozoic are illustrated. The Early Mesozoic as used here includes all of the Triassic and Jurassic Periods and the Neocomian Stage of the Cretaceous.

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Fensome, R. A., R. A. MacRae, J. M. Moldowan, F. J. R. Taylor et G. L. Williams. « The early Mesozoic radiation of dinoflagellates ». Paleobiology 22, n^o 3 (1996) : 329–38. http://dx.doi.org/10.1017/s0094837300016316.

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Dinoflagellates are a major component of the marine microplankton and, from fossil evidence, appear to have been so for the past 200 million years. In contrast, the pre-Triassic record contains only equivocal occurrences of dinoflagellates, despite the fact that comparative ultrastructural and molecular phylogenetic evidence indicates a Precambrian origin for the lineage. Thus, it has often been assumed that the dearth of Paleozoic fossil dinoflagellates was due to a lack of preservation or recognition and that the relatively sudden appearance of dinoflagellates in the Mesozoic is an artifact of the record. However, new evidence from a detailed analysis of the fossil record and from the biogeochemical record indicates that dinoflagellates did indeed undergo a major evolutionary radiation in the early Mesozoic.

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Shubin, Neil H., et Hans-Dieter Sues. « Biogeography of early Mesozoic continental tetrapods : patterns and implications ». Paleobiology 17, n^o 3 (1991) : 214–30. http://dx.doi.org/10.1017/s0094837300010575.

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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.

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MAKSOUD, SIBELLE, DENISE ISKANDAR-TABIB et DANY AZAR. « Tannoura : A new early Barremian fossiliferous amber outcrop from South Lebanon ». Mesozoic 1, n^o 1 (28 mars 2024) : 90–98. http://dx.doi.org/10.11646/mesozoic.1.1.7.

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A fossiliferous amber outcrop in Tannoura (Rashayya District, Southern Lebanon) is described. This new discovery constitutes the 30th amber outcrop with biological inclusions in Lebanon and enriches and improves our knowledge about the palaeobiodiversity and palaeoenvironment of the North-Eastern coast of Gondwana during the early Barremian. Also, an infrared spectrum of the amber from Tannoura is given and discussed.

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Bown, P. R., M. K. E. Cooper et A. R. Lord. « A Calcareous Nannofossil Biozonation Scheme for the early to mid Mesozoic ». Newsletters on Stratigraphy 20, n^o 2 (20 décembre 1988) : 91–114. http://dx.doi.org/10.1127/nos/20/1988/91.

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DiMichele, William A., Sergius H. Mamay, Dan S. Chaney, Robert W. Hook et W. John Nelson. « An Early Permian flora with Late Permian and Mesozoic affinities from north-central Texas ». Journal of Paleontology 75, n^o 2 (mars 2001) : 449–60. http://dx.doi.org/10.1017/s0022336000018230.

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Early Permian (late Leonardian Series) plant assemblages from King, Knox, and Stonewall Counties of North-Central Texas are dominated by seed plants, some apparently congeneric with taxa heretofore known only from the Late Permian or the Mesozoic. Conifers are the dominant elements, including one or more species of Ullmannia, Pseudovoltzia liebeana, both known from the Late Permian Zechstein flora of Germany and England, Podozamites sp., characteristic of the Mesozoic, and Walchia sp., abundant in Early Permian floras. Locally common are Taeniopteris cf. eckardtii, a Zechstein species, an unidentified plant represented by pinnulelike laminae with fine parallel veins, similar to pinnules of some Mesozoic cycads, and calamite stems. Rarely encountered are leaf fragments of the Paleozoic ginkgophyte Dicranophyllum, flabellate ginkgophyte leaves, leaves with a broad midvein and narrow, fimbriate lamina, and Wattia, typical of the Early Permian. Associated with these foliar remains are ovulate reproductive structures including the presumed cycad megasporophyll Dioonitocarpidium, known only from the Mesozoic, a voltzialean cone scale similar to Swedenborgia, and a variety of seeds, some remarkably similar to Agathis, of Cretaceous age. The assemblage includes only rare scraps of foliage and seeds possibly attributable to the pteridophyllous elements (gigantopterids, callipterids, and ferns) that dominate the Permian. The fossil plants occur in multistorey, fining-upwards, tidal-channel deposits that also include pelecypods and fragmentary palaeoniscoid fish. The occurrence of derived lineages in xeric habitats during the Early Permian indicates that some supposed Mesozoic groups actually preceded and survived the end-Permian extinction, reappearing in basinal lowlands during the mid-Mesozoic.

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Rowe, Timothy. « The Early History of Theropods ». Short Courses in Paleontology 2 (1989) : 100–112. http://dx.doi.org/10.1017/s2475263000000891.

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Theropods have traditionally been portrayed as extinct bipedal predators built along the lines of such celebrated terrors as Tyrannosaurus, Deinonychus, and Allosaurus. The earliest theropods indeed fit that image, and all of them are decidedly extinct. However, it has become increasingly apparent that living birds trace their genealogy to those extinct theropods (Ostrom, 1976; Gauthier, 1986; Gauthier and Padian, 1985 and this volume), and that any adequate consideration of the evolutionary history of Theropoda must assess the lineage as a whole, instead of arbitrarily focusing on the Mesozoic forms alone. When the approximately 8,600 living avian descendants of the ancestral theropod are taken into account, together with the various extinct Mesozoic and Cenozoic taxa, theropods display a far greater range of size, form, behavior, and diet than we ever pictured in our traditional image.

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Pavliuk, M., et A. Medvedev. « PANCARDI MAGMATISM AND STRUCTURE IN EARLY MESOZOIC ». Visnyk of Taras Shevchenko National University of Kyiv. Geology, n^o 66 (2014) : 27–33. http://dx.doi.org/10.17721/1728-2713.66.04.

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Suh, Alexander, Claudia C. Weber, Christian Kehlmaier, Edward L. Braun, Richard E. Green, Uwe Fritz, David A. Ray et Hans Ellegren. « Early Mesozoic Coexistence of Amniotes and Hepadnaviridae ». PLoS Genetics 10, n^o 12 (11 décembre 2014) : e1004559. http://dx.doi.org/10.1371/journal.pgen.1004559.

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Zhou, Zuyi, Qiuyuan Lao, Huanjiang Chen, Sijiang Ding et Zhongting Liao. « Early Mesozoic orogeny in Fujian, southeast China ». Geological Society, London, Special Publications 106, n^o 1 (1996) : 549–56. http://dx.doi.org/10.1144/gsl.sp.1996.106.01.35.

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Thèses sur le sujet "Early Mesozoic"

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Gower, David John. « Morpholgy and relationships of the earliest archosaurs ». Thesis, University of Bristol, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.240791.

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Baatar, Munkhbat, Bat-Ulzii Dash, Chuluun Danzan, Gerel Ochir et Khishigsuren Sodnom. « Origin of the Early Mesozoic Bogd Uul granite pluton, Ulaanbaatar area, Mongolia ». 名古屋大学博物館, 2012. http://hdl.handle.net/2237/18190.

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Alfandi, Emhemed. « Early Mesozoic stratigraphy, sedimentology and structure of the Gharian area, north-western Libya ». Thesis, University of Plymouth, 2012. http://hdl.handle.net/10026.1/917.

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The Gharian area is used as a case study to examine the sedimentary succession, structural evolution and timing of sedimentary and structural events during basin development in the Early Mesozoic. These sediments (Kurrush, Al Aziza and Abu Shaybah Formations) are examined in order to provide palaeonvironmental and palaeogeographic reconstructions for the study area. The formations are described using facies analysis. The Kurrush is probably deposited in delta plain environment. A complete section (140 m) has been logged and seven facies from the Al Aziza Formation represent a shallow shelf platform area (inner ramp: an intertidal-subtidal carbonate flat to shelf lagoonal environment), which was deposited during the opening of the Early Triassic Neo-Tethys Ocean. Eleven localities from the Abu Shaybah Formation have been investigated with a cumulative thickness of 125 m. Ten facies from the Abu Shaybah Formation represent deposition in a shallow marine environment as part of low gradient continental margin, succeeded by sand deposition in braided and meandering fluvial systems. Regional tectonic activity, regional relative sea-level fluctuations and climatic conditions led to control of the sedimentary megasequences (266 m coarsening upward and fining upward megasequence). A magnetostratigraphic analysis was undertaken in the above units as their depositional age is poorly constrained and currently based on limited fossil evidence. Most of these samples convey a weak but stable remanent magnetization. The Al Aziza Formation yielded a primary remanence that has suffered a substantial post-acquisition clockwise rotation (~50˚). Restoration of the rotation about a simple vertical axis would place the pole on the APW path at an appropriate point in time. The palaeomagnetic data from the studied formations yield a distinct series of polarity zones that provide clear local and regional correlation and are readily tied to a recently compiled global magnetostratigraphic time scale. The Al Aziza Formation at Gharian is latest Ladinian in age, whilst the Abu Shaybah Formation is earliest Carnian in age. The Abu Shaybah Formation at Gharian suggests that the stratigraphic equivalence with the Aziza Formation at Azizyah and Kaf Bates (Jafarah Plain). The study established that the Gharian area is the expression of major normal faults (NNE-SSW, WNW to ESE, NW to NNW and NE-SE) in a system of half-grabens which formed as part of the African extensional margin on the southern Tethyan margin in Latest Early Cretaceous.

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Johnson, S. A. « Remagnetizations in late Palaeozoic to Early Mesozoic continental sediments of the United Kingdom ». Thesis, University of Birmingham, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.524736.

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This thesis represents the results of a study concerned with the various chemical and thermal processes which produce remagnetizations in continental sediments. Information has been gathered from a number of disciplines; palaeomagnetism, petrography, diagenesis, thermal history modelling. These techniques have been combined to produce a model of the processes by which sediments in particular areas of the United Kingdom have been remagnetized. In southwest Dyfed (South Wales), the Old Red Sandstone (Silurian to Devonian in age) has been remagnetized both chemically and thermally in the Late Carboniferous by fluids precipitated during the Variscan Orogeny. This can be concluded from the palaeomagnetic data which indicate that the remagnetization occurred approximately half-way through the Variscan folding event. In Anglesey (North Wales), the Old Red Sandstone (Lower Devonian) was folded by an earlier event, the Acadian Orogeny (Middle Devonian) and was not greatly affected by the Variscan event which was terminated over 100km to the south. However, the uplift associated with the Variscan event brought the Old Red Sandstone of Anglesey into the realm of oxidising fluids and chemically-precipitated haematite produced a remagnetization which is Permian in age. Fold tests clearly show that the remagnetization post-dates folding in this area. In the southern North Sea, the Barren Red Measures (Westphalian C, Carboniferous) contain chemically-precipitated haematite which was also produced as a result of Permian uplift in the wake of the Variscan Orogeny. However, the main remagnetization is associated with Triassic haematite precipitation produced by lateral flow of fluids along permeable channel sandstone units. The fact that some of the sandstones are remagnetized at this time whilst others are not is perhaps indicative of the interconnectivity of the sandbodies. In southwest Birmingham (Central England) the Keele Formation (Westphalian D, Carboniferous) provides an onshore analogue (in terms of age) to the southern North Sea samples. In this area there is a similar Permian age of remagnetization as that seen in Anglesey, produced as a result of uplift in the Variscan foreland. However, unlike Anglesey, these rocks also contain a primary magnetization which can be isolated from thermal demagnetization experiments. Present day weathering of the Keele Formation has imposed a weak magnetization (probably held within grains of goethite) on those rocks which lie within 10m of the surface, particularly in the more permeable sandstone units. The other effect of the present day weathering is that it tends to remove the finer grains of haematite which tend to be associated with Permian remagnetization. On the Isle of Arran (West Scotland) the New Red Sandstone (Permian and Triassic) has been remagnetized by a number of igneous intrusions which were produced as a result of Lower Tertiary hot spot activity beneath the British Isles. Palaeomagnetic experiments have been compared with computer models of heat flow around a small dyke to show that the remagnetization associated with the intrusions is a product of both thermal and chemical processes. The thermal processes are a product of direct heat flow from the intrusions which thermally remagnetizes pre-existing magnetic grains. However, the chemical processes are driven by convectional flow of fluids through the permeable Permian and Triassic sandstones to precipitate new magnetite and haematite grains. Despite the high level of thermal and chemical activity in this region in the Lower Tertiary, many of the rocks still retain a primary component of magnetization associated with deposition or early post-depositional processes. In summary, the pre-Permian sediments studied in this thesis appear to be particularly prone to remagnetization as a result of Variscan movements and the resulting uplift of southern Britain. On the Isle of Arran Permian and Triassic sediments which post-date the Variscan event are affected by a combined thermal and chemical remagnetization associated with Early Tertiary hot spot activity. The results of this thesis have shown the value of using palaeomagnetic techniques to time remagnetizations in continental sediments. In addition, the results have outlined a number of key geological events since the Devonian which are likely to be responsible for a number of the remagnetizations seen in the rocks of the United Kingdom. Therefore, these results can be used in a predictive manner for future palaeomagnetic studies in the rocks of this country and perhaps even further afield. For example, the effects of the Variscan Orogeny have produced remagnetizations in the rocks of Europe, Africa and north America. It is considered essential that all future work in this field should include the study of the burial history for the sedimentary basins covered as the remagnetizations explained in this work have all been intimately related to particular burial or uplift episodes. In addition, petrographic analysis helps to distinguish the textural phases of the magnetic grains which are responsible for the remagnetizations and are thus also essential elements in the study of remagnetizations in sedimentary basins.

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Klompmaker, Adiël A. « Mesozoic Decapod Diversity with an Emphasis on the Early Cretaceous (Albian) of Spain ». Kent State University / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=kent1342548658.

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Solomon, G. Cleve Taylor Hugh P. « An 18O/16O study of Mesozoic and early Tertiary granitic batholiths of the southwestern North American Cordillera / ». Diss., Pasadena, Calif. : California Institute of Technology, 1989. http://resolver.caltech.edu/CaltechETD:etd-01192007-082647.

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Yan, Chaolei. « The Neoproterozoic tectonic evolution of the western Jiagenen Orogenic Belt and its Early Paleozoic-Mesozoic tectonic reworking ». Thesis, Orléans, 2018. http://www.theses.fr/2018ORLE2041/document.

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La chaîne de collision d'âge néoprotérozoïque de Jiangnan, orientée NE-SW, marque la limite entre les blocs duYangtze et de Cathaysia. Son évolution tectonique reste encore débattue. Une des questions les plus controversées est l'âge de la collision entre les deux blocs. Afin d'acquérir une meilleure compréhension de ce problème, nous avons collecté des échantillons dans les couches sédimentaires situées au-dessus et au-dessous de la discordance dans le but de comparer les spectres d'âge des zircons détritiques et aussi de les confronter à ceux décrits dans les séries néoprotérozoïques des régions du Yangtze, Jiangnan et Cathaysia. En outre, nous nous sommes intéressés aux plutons granitiques d'âge néoproterozoïque de Sanfang et Yuanbaoshan, de type-S, situés dans la partie occidentale de la chaîne de Jiangnan afin de tracer l'évolution tectonique de la région depuis 830 Ma par la mise en œuvre de méthodes pluridisciplinaires : géologie structurale, géochronologie U-Pb, AMS, modélisation gravimétrique et thermochronologie Argon.Notre étude montre les résultats suivants : (i) La chaîne de Jiangnan s'est formée par la collision des blocs de Yangtze et Cathaysia entre ca. 865 and 830 Ma ; (ii) Les intrusions granitiques de 830 Ma se sont mises en place dans des formations encaissantes du groupe Sibao plissées et faillées. Les plutons ont été construits par accumulation latérale E-W de filons N-S, avec un écoulement horizontal du magma du sud vers le nord ; (iii). Un cisaillement ductile du haut vers l'Ouest a été reconnu dans la partie supérieure des plutons. Des âges Ar/Ar vers 420 Ma obtenus sur plusieurs grains de muscovite et biotite déformés impliquent que le cisaillement ductile peut être : a) formé pendant l'orogenèse du Paléozoïque inférieur de Chine du Sud, ou b) pendant la mise en place des plutons au Néoprotérozoïque dans une croûte chaude, sous la température de fermeture du chronomètre argon, puis lors de l'orogenèse du Paléozoïque inférieur, ce domaine crustal de Chine du Sud est passé au-dessous de 350°C; (iv) Durant la période 420-240 Ma, la région de Sanfang-Yuanbaoshana connu un refroidissement lent qui pourrait correspondre au ré-équilibrage isostatique de la croûte
The Jiangnan Orogenic Belt is a NE-SW trending Neoproterozoic collisional suture, marking the boundary between the Yangtze Block and the Cathaysia Block. Its tectonic evolution is still debated. One of the most controversial questions is the timing of the collision between the Yangtze and Cathaysia blocks. In order to have a better understanding of this problem, we have collected the sedimentary rocks from the strata both overlying and underlying the Neoproterozoic unconformities to compare the detrital zircon age spectra between them, as well as to compare the detrital zircon spectra of Neoproterozoic sequences among the Yangtze, Jiangnan and Cathaysia regions. Moreover, we paid attention to the Neoproterozoic S-type granite plutons located in the western Jiangnan region in order to trace the crustal evolution in the Sanfang-Yuanbaoshan area since 830 Ma by multidisciplinary methods, including structural geology, geochronology, AMS, gravity modelling and Argon isotopic dating.Our study shows that : (i) The Jiangnan Orogenic Belt was built up due to the assembly of the Yangtze and Cathaysia blocks between ca. 865 and 830 Ma ; (ii) The 830 Ma granitic magma intruded into the pre-existing folds and faults in the Sibao group, the tongue-and/orsill-shaped plutonswere constructed by anE-W lateral accumulation of N-S oriented dykeswith adominantly northward horizontal magma flow from south to north ; (iii)A top-to-the-W ductile shearband has been identified on the top of plutons, (iv) the coherent mica Ar-Ar age of ca. 420 Ma, obtained from the deformed muscovite, implies that this shearing may be formed either a)during the Early Paleozoicorogeny, or b) during the Neoproterozoic plutons emplacement, then the plutons were exhumed by the Paleozoic orogeny ; (iv) During the 420-240 Ma period, the Sanfang-Yuanbaoshan area has experienced a slow cool ingrate, which may correspond to the isostatic re-equilibration of the crust

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Dailly, Paul Anthony. « The Late Palaeozoic and Early Mesozoic structure and evolution of the Solway and Vale of Eden Basin complex ». Thesis, University of Oxford, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.259772.

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Scherer, Hannah Howell. « Field, geochronologic, and geochemical constraints on the early mesozoic paleogeographic and tectonic evolution of the central Klamath Mountains, California / ». May be available electronically:, 2006. http://proquest.umi.com/login?COPT=REJTPTU1MTUmSU5UPTAmVkVSPTI=&clientId=12498.

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Restrepo, Pedro Alonso. « Late Precambrian to Early Mesozoic tectonic evolution of the Colombian Andes, based on new geochronological geochemical and isotopic data ». Diss., The University of Arizona, 1995. http://hdl.handle.net/10150/187450.

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⁴⁰Ar/³⁹Ar and U/Pb geochronology of the basement rocks in the Colombian Andes confirm the presence of the Grenvillian age high metamorphic grade belt . The Grenvillian, or locally known as Nickerie-Orinoquiense orogenic belt, is exposed within basements uplifts along the Eastern Cordillera of Colombia and the Sierra Nevada of Santa Marta in the Caribbean coast. Rare Earth element geochemistry and petrology indicate that the Nickerie-Orinoquiense basement rock's protoliths are dominantly of continental affinity, now consisting mainly of metapsammites, metavolcanics and metaplutonic rocks metamorphosed to granulite facies PT conditions. Nd crustal residence ages and U/Pb zircon data indicate variable involvement of 'older' Late Archean - Early Proterozoic components and 'younger' ~ 1.1 Ga additions, which were tectonically mixed during the Nickerie-Orinoquian collisional metamorphic episode. Low metamorphic grade rocks that overlie the Nickerie-Orinoquian basement are exposed along the Eastern Cordillera of Colombia at the Quetame-Floresta-Santander massifs, Périja Range and Merida Andes. A U/Pb zircon age obtained from a synkinematic pluton structurally concordant with the low metamorphic grade belt from the Santander Massif, yielded a 477 ± 16 Ma, indicating a Mid-Ordovician regional greenschist to amphibolite facies metamorphic event for these rocks. The latter is referred-to as the 'Caparonensis Orogeny' in the Venezuelan Andes. Rare Earth Element geochemistry and petrologic data indicate that the low metamorphic grade belt consists of a thick supracrustal sequence i.e. metapelitic-metapsammitic sequence with minor crosscutting mafic dikes. Additional trace element discrimination plots indicate that the Caparonensis synkinematic plutons are of continental arc affinity. ⁴⁰Ar/ ³⁹Ar geochronology, petrology and field observations in Santander Massif, indicate a widespread regional metamorphic overprint took place in Late Triassic-Early Jurassic time. This event was the result of a thermal welt associated with back-arc extension and concomitant intrusion of a high volume of calk-alkalic plutons. Deposition of a thick molassic sequence (2000-4000 m) followed, flanking the uplifted region. The lower Paleozoic metamorphic rocks were elevated from greenschist to sillimanite (locally kyanite) PT metamorphic conditions and the Mid-Upper Paleozoic sedimentary cover was locally metamorphosed from greenschist to lower PT metamorphic conditions, as a function of relative distance to the plutonic centers at time of metamorphism.

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Livres sur le sujet "Early Mesozoic"

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C, Fraser Nicholas, et Sues Hans-Dieter 1956-, dir. In the shadow of the dinosaurs : Early Mesozoic tetrapods. Cambridge : Cambridge University Press, 1994.

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Hartman, Joseph Herbert. The stratigraphy of Mesozoic and early Cenozoic nonmarine mollusks of Colorado. Denver, Colo : Denver Museum of Natural History, 1998.

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1929-, Froelich A. J., Robinson G. R et Geological Survey (U.S.), dir. Studies of the early Mesozoic Basins of the Eastern United States. [Reston, Va.?] : Dept. of the Interior, U.S. Geological Survey, 1988.

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M, Dickins J., dir. Late Palaeozoic and early Mesozoic circum-Pacific events and their global correlation. Cambridge : Cambridge University Press, 1997.

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1929-, Froelich A. J., et Robinson G. R, dir. Studies of the early Mesozoic basins of the eastern United States : A summary of current research on early Mesozoic sedimentary and igneous rocks and related mineral resources ... Washington, D.C : U.S. G.P.O., 1988.

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R, Robinson G., et Froelich A. J. 1929-, dir. Studies of the early Mesozoic basins of the eastern United States : A summary of current research on early Mesozoic sedimentary and igneous rocks and related mineral resources ... Washington, DC : Dept. of the Interior, 1988.

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Olsen, Paul E., Roy W. Schlische et Pamela J. W. Gore, dir. Tectonic, Depositional, and Pleoecological History of Early Mesozoic Rift Basins, Eastern North America. Washington, D. C. : American Geophysical Union, 1989. http://dx.doi.org/10.1029/ft351.

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Johnson, Stephen Arthur. Remagnetization of Late Palaeozoic and Early Mesozoic continental sediments in the United Kingdom. Birmingham : University of Birmingham, 1993.

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S, Harwood David, Miller M. Meghan 1957-, Geological Society of America. Cordilleran Section. et Geological Society of America. Rocky Mountain Section., dir. Paleozoic and early Mesozoic paleogeographic relations : Sierra Nevada, Klamath Mountains, and related terranes. Boulder, Colo : Geological Society of America, 1990.

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A, Nowroozi Ali, et Geological Survey (U.S.), dir. Principal facts for new gravity stations in the area of the Richmond Early Mesozoic basin, Virginia. [Denver, Colo.?] : U.S. Dept. of the Interior, Geological Survey, 1988.

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Chapitres de livres sur le sujet "Early Mesozoic"

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Ziegler, Alfred M., J. Michael Parrish, Yao Jiping, Eric D. Gyllenhaal, David B. Rowley, Judith Totman Parrish, Nie Shangyou, Andrew Bekker et Michael L. Hulver. « Early Mesozoic phytogeography and climate ». Dans Palaeoclimates and their Modelling, 89–97. Dordrecht : Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-011-1254-3_11.

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de la Fuente, Marcelo S., Juliana Sterli et Ignacio Maniel. « Early Differentiation of Mesozoic Turtles ». Dans Origin, Evolution and Biogeographic History of South American Turtles, 143–60. Cham : Springer International Publishing, 2013. http://dx.doi.org/10.1007/978-3-319-00518-8_7.

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Evans, Susan E., et Marc E. H. Jones. « The Origin, Early History and Diversification of Lepidosauromorph Reptiles ». Dans New Aspects of Mesozoic Biodiversity, 27–44. Berlin, Heidelberg : Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-10311-7_2.

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Roghi, Guido, Ricardo Araújo, Massimo Bernardi, Fabrizio Bizzarini, Mirco Neri, Fabio Massimo Petti, Rossana Sanfilippo et Edoardo Martinetto. « Early Mesozoic Nature In and Around Tethys ». Dans Springer Textbooks in Earth Sciences, Geography and Environment, 231–51. Cham : Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-35058-1_9.

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Le Corre, C. « Early Tectonic Events (Ordovician) ». Dans Pre-Mesozoic Geology in France and Related Areas, 179–82. Berlin, Heidelberg : Springer Berlin Heidelberg, 1994. http://dx.doi.org/10.1007/978-3-642-84915-2_18.

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Ahmad, Faiz, A. H. M. Ahmad et Sumit K. Ghosh. « Diagenetic Controls on the Early to Late Bathonian Fort Member Sandstone of Jaisalmer Formation, Western Rajasthan ». Dans Mesozoic Stratigraphy of India, 373–404. Cham : Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-71370-6_13.

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Chinnappa, Ch, Pauline Sabina Kavali, A. Rajanikanth, Mercedes di Pasquo et M. E. C. Bernardes-de-Oliveira. « Early Cretaceous Flora from the East Coast Sedimentary Basins of India : Their Chronostratigraphic and Palaeobiogeographic Significance ». Dans Mesozoic Stratigraphy of India, 469–528. Cham : Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-71370-6_17.

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Ghosh, Amit K., Reshmi Chatterjee, Subhankar Pramanik et Ratan Kar. « Radiation of Flora in the Early Triassic Succeeding the End Permian Crisis : Evidences from the Gondwana Supergroup of Peninsular India ». Dans Mesozoic Stratigraphy of India, 87–113. Cham : Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-71370-6_3.

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Kotha, Mahender. « An Overview of the Mesozoic (Middle Jurassic to Early Cretaceous) Stratigraphy, Sedimentology and Depositional Environments of the Kachchh Mainland, Gujarat, India ». Dans Mesozoic Stratigraphy of India, 115–55. Cham : Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-71370-6_4.

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Desai, Bhawanisingh G., et Suruchi Chauhan. « Taphonomic Pathways for the Formation of Bioturbated Cycles in the Early Cretaceous Wave-Dominated Deltaic Environment : Ghuneri Member, Kachchh Basin, India ». Dans Mesozoic Stratigraphy of India, 311–32. Cham : Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-71370-6_11.

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Actes de conférences sur le sujet "Early Mesozoic"

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Miller, Kenneth, James Browning, W. John Schmelz et James D. Wright. « EARLY EOCENE PERSPECTIVES ON MESOZOIC GREENHOUSE WORLDS ». Dans GSA Connects 2024 Meeting in Anaheim, California. Geological Society of America, 2024. http://dx.doi.org/10.1130/abs/2024am-401176.

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Davidson, Gavin Jeffrey, et Christopher McRoberts. « LATITUDINAL BIODIVERSITY GRADIENTS FOR LATE-PALEOZOIC AND EARLY MESOZOIC SYNAPSIDS ». Dans 53rd Annual GSA Northeastern Section Meeting - 2018. Geological Society of America, 2018. http://dx.doi.org/10.1130/abs/2018ne-311121.

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Villarreal, Dustin, Alex C. Robinson, James Worthington, James B. Chapman, Barbara Carrapa, Ilhomjon Oimahmadov, Brian MacDonald et Mustafo Gadoev. « SEDIMENTOLOGICAL EVIDENCE FOR EARLY MESOZOIC CRUSTAL SUTURING OF THE PAMIR ». Dans GSA Annual Meeting in Seattle, Washington, USA - 2017. Geological Society of America, 2017. http://dx.doi.org/10.1130/abs/2017am-303094.

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Rogov, M. A. « EARLY JURASSIC GLENDONITES AND CLIMATE OF THE NORTHERN HEMISPHERE ». Dans PALEONTOLOGY, STRATIGRAPHY AND PALEOGEOGRAPHY OF THE MESOZOIC AND CENOZOIC IN BOREAL REGIONS. Trofimuk Institute of Petroleum Geology and Geophysics (SB RAS), 2021. http://dx.doi.org/10.18303/b978-5-4262-0104-0-176.

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Poole, Forrest G., et Ricardo Amaya-Martínez. « COEVAL BASINS WITHIN EARLY MESOZOIC CORDILLERAN RETROARC FORELAND SYSTEM OF SONORA, MEXICO ». Dans Joint 70th Annual Rocky Mountain GSA Section / 114th Annual Cordilleran GSA Section Meeting - 2018. Geological Society of America, 2018. http://dx.doi.org/10.1130/abs/2018rm-313909.

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Brickey, Timothy, A. P. Barth et Nancy Riggs. « EARLY MESOZOIC VOLCANICLASTIC ROCKS OF AGNEW MEADOWS, EAST-CENTRAL SIERRA NEVADA, CALIFORNIA ». Dans GSA Annual Meeting in Indianapolis, Indiana, USA - 2018. Geological Society of America, 2018. http://dx.doi.org/10.1130/abs/2018am-316982.

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Shapiro, Russell. « THE ELUSIVE LATE PALEOZOIC AND EARLY MESOZOIC HYDROCARBON-SEEP RECORD OF NEVADA ». Dans Cordilleran Section - 119th Annual Meeting - 2023. Geological Society of America, 2023. http://dx.doi.org/10.1130/abs/2023cd-387592.

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Barboza-Gudiño, José Rafael, et Diego Jaime Rodríguez. « THE ANCIENT PACIFIC MARGIN OF MEXICO DURING THE LATEST PALEOZOIC EARLY MESOZOIC TIME ». Dans GSA Connects 2022 meeting in Denver, Colorado. Geological Society of America, 2022. http://dx.doi.org/10.1130/abs/2022am-378310.

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Li, Yu, Wen-Liang Xu et Feng Wang. « Late Jurassic to Early Early Cretaceous Tectonic Nature on the NE Asian Continental Margin : Constraints from Mesozoic Accretionary Complexes ». Dans Goldschmidt2020. Geochemical Society, 2020. http://dx.doi.org/10.46427/gold2020.1535.

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Taylor, Brendan, et Jennifer Cooper Boemmels. « EXPLORING EVIDENCE FOR EARLY MESOZOIC FAULTING IN THE WESTERN ORANGE-MILFORD BELT OF CONNECTICUT ». Dans Northeastern Section - 57th Annual Meeting - 2022. Geological Society of America, 2022. http://dx.doi.org/10.1130/abs/2022ne-375280.

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Rapports d'organisations sur le sujet "Early Mesozoic"

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Ernst, W. G. Fluid flow, element migration, and petrotectonic evolution of the early Mesozoic Central Klamath island arc, northwesternmost California. Office of Scientific and Technical Information (OSTI), juin 1991. http://dx.doi.org/10.2172/6033634.

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Ernst, W. G. Fluid flow, element migration, and petrotectonic evolution of the Early Mesozoic central Klamath Island arc, northwesternmost California. Progress report. Office of Scientific and Technical Information (OSTI), décembre 1992. http://dx.doi.org/10.2172/171252.

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Correia, V., R. A. Fensome, R. A. MacRae, L. T. Dafoe et G. L. Williams. Mesozoic event-stratigraphy of the Scotian Margin, offshore Nova Scotia : preliminary palynological results from the Upper Member of the Missisauga Formation in Panuke B-90. Natural Resources Canada/CMSS/Information Management, 2023. http://dx.doi.org/10.4095/331910.

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Conceived as a continuation of the previous multidisciplinary event stratigraphy studies of the Late Cretaceous to Neogene of the Scotian Margin in the 2000s, the "Mesozoic eventstratigraphy of the Scotian Margin" project proposes a similar study for the Late Triassic to Early Cretaceous interval. The first stage of this project comprises a detailed multidisciplinary study of the composite Lower Cretaceous section from Panuke B-90 and Cohasset A-52 conventional cores. The present work reports initial palynologic data from the formal Upper Member of the Missisauga Formation in Panuke B-90. These data, combined with preliminary insights from sedimentary facies, macrofossil, and trace fossil analyses, suggest that from the base of the studied section upwards involves a transition from a neritic/shelfal to a mainly estuarine-brackish setting. This was followed by a transgressive cycle through the Upper Member of the Missisauga Formation, which culminated in a return of more fully marine environments near the base of the overlying Naskapi Member of the Logan Canyon Formation. It is apparent that this transgression is not continuous, but intercalated with smaller cycles, well documented by the fluctuations in dominance between terrestrial (pollen and spore abundance) versus marine (mainly dinoflagellate-cyst abundance and richness) palynomorph trends through this succession, presented here in three main intervals. The dinoflagellate-cyst assemblages and key bioevents recorded in this initial study indicate a Barremian age for the Upper Member of the Missisauga Formation in Panuke B-90. The overlying Naskapi Member is expected to be of early Aptian age based on previous reports of the presence of the age-diagnostic ammonite Deshayesites sp. Ongoing work on the conventional cores from Panuke B-90, and subsequently Cohasset A-52 and other wells, will contribute to a comprehensive Mesozoic event-stratigraphic framework for the Scotian Margin.

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Ernst, W. G. Fluid flow, element migration, and petrotectonic evolution of the early Mesozoic Central Klamath island arc, northwesternmost California. Progress report, September 15, 1990--September 14, 1991. Office of Scientific and Technical Information (OSTI), juin 1991. http://dx.doi.org/10.2172/10104952.

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Tweet, Justin, Holley Flora, Summer Weeks, Eathan McIntyre et Vincent Santucci. Grand Canyon-Parashant National Monument : Paleontological resource inventory (public version). National Park Service, décembre 2021. http://dx.doi.org/10.36967/nrr-2289972.

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Grand Canyon-Parashant National Monument (PARA) in northwestern Arizona has significant paleontological resources, which are recognized in the establishing presidential proclamation. Because of the challenges of working in this remote area, there has been little documentation of these resources over the years. PARA also has an unusual management situation which complicates resource management. The majority of PARA is administered by the Bureau of Land Management (BLM; this land is described here as PARA-BLM), while about 20% of the monument is administered by the National Park Service (NPS; this land is described here as PARA-NPS) in conjunction with Lake Mead National Recreation Area (LAKE). Parcels of state and private land are scattered throughout the monument. Reports of fossils within what is now PARA go back to at least 1914. Geologic and paleontologic reports have been sporadic over the past century. Much of what was known of the paleontology before the 2020 field inventory was documented by geologists focused on nearby Grand Canyon National Park (GRCA) and LAKE, or by students working on graduate projects; in either case, paleontology was a secondary topic of interest. The historical record of fossil discoveries in PARA is dominated by Edwin McKee, who reported fossils from localities in PARA-NPS and PARA-BLM as part of larger regional projects published from the 1930s to the 1980s. The U.S. Geological Survey (USGS) has mapped the geology of PARA in a series of publications since the early 1980s. Unpublished reports by researchers from regional institutions have documented paleontological resources in Quaternary caves and rock shelters. From September to December 2020, a field inventory was conducted to better understand the scope and distribution of paleontological resources at PARA. Thirty-eight localities distributed across the monument and throughout its numerous geologic units were documented extensively, including more than 420 GPS points and 1,300 photos, and a small number of fossil specimens were collected and catalogued under 38 numbers. In addition, interviews were conducted with staff to document the status of paleontology at PARA, and potential directions for future management, research, protection, and interpretation. In geologic terms, PARA is located on the boundary of the Colorado Plateau and the Basin and Range provinces. Before the uplift of the Colorado Plateau near the end of the Cretaceous 66 million years ago, this area was much lower in elevation and subject to flooding by shallow continental seas. This led to prolonged episodes of marine deposition as well as complex stratigraphic intervals of alternating terrestrial and marine strata. Most of the rock formations that are exposed in the monument belong to the Paleozoic part of the Grand Canyon section, deposited between approximately 510 and 270 million years ago in mostly shallow marine settings. These rocks have abundant fossils of marine invertebrates such as sponges, corals, bryozoans, brachiopods, bivalves, gastropods, crinoids, and echinoids. The Cambrian–Devonian portion of the Grand Canyon Paleozoic section is represented in only a few areas of PARA. The bulk of the Paleozoic rocks at PARA are Mississippian to Permian in age, approximately 360 to 270 million years old, and belong to the Redwall Limestone through the Kaibab Formation. While the Grand Canyon section has only small remnants of younger Mesozoic rocks, several Mesozoic formations are exposed within PARA, mostly ranging in age from the Early Triassic to the Early Jurassic (approximately 252 to 175 million years ago), as well as some middle Cretaceous rocks deposited approximately 100 million years ago. Mesozoic fossils in PARA include marine fossils in the Moenkopi Formation and petrified wood and invertebrate trace fossils in the Chinle Formation and undivided Moenave and Kayenta Formations.

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Hammond, Becky J. Interim Geologic Map of the Jarvis Peak Quadrangle, Washington County, Utah (GIS Reproduction of UGS OFR-212 [1991]). Utah Geological Survey, décembre 2023. http://dx.doi.org/10.34191/ofr-753dr.

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The Jarvis Peak Quadrangle in southwestern most Utah encompasses the southern portion of the Beaver Dam Mountains and lies within the transition zone between the Colorado Plateau and Basin and Range physiographic provinces. The Beaver Dam Mountain uplift isa northwest-trending, doubly-plunging anticline bounded on the east by the Shivwits syncline. These major folds were developed during the late Mesozoic-early Cenozoic Sevier-Laramide orogeny and are truncated on the east by the Grand Wash-Reef Reservoir-Gunlock fault zone. The Grand Wash fault is a major normal fault that extends southward from the quadrangle to the Grand Canyon. Late Cenozoic (late Miocene to quaternary) extension also caused gravity sliding and attenuation faulting along both sides of the range. The stratigraphic section exposed in the quadrangle ranges in age from Precambrian to Triassic and totals approximately 14,000 feet. The Silurian and Ordovician are the only periods not represented. Surficial units include Quaternary-Tertiary and Quaternary alluvial gravels, pediments, talus, colluvium and landslide materials. Commodities mined from or occurring in the quadrangle include lead, zinc, silver, copper, gallium, germanium, gypsum and sand and gravel.

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Shaffer, Austin, Justin Tweet et Vincent Santucci. Colorado National Monument : Paleontological resource inventory (sensitive version). National Park Service, 2024. http://dx.doi.org/10.36967/2303444.

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Colorado National Monument (COLM) in western Colorado was established on May 24, 1911 with the purpose of preserving, understanding, and enjoying the natural and cultural resources of the landscape, focusing on the history, erosional processes, and geology present. Although not explicitly mentioned in the monument?s purpose statement, the paleontological resources of COLM are nevertheless important. Significant fossils have been known from the area since the late 19th and early 20th centuries, and from COLM specifically within a few decades of the monument?s founding. The direct urban interface of COLM with Colorado?s Grand Valley provides unique management concerns for fossils and other resources of the monument. While COLM preserves a long geologic history (roughly 1.7 billion years ago to the present), the fossils preserved at the monument mostly come from sedimentary rocks of the Mesozoic Era. The paleontological resources of COLM include both body fossils and trace fossils of a wide variety of organisms (e.g., freshwater mussels, dinosaurs, plants) representing diverse paleoenvironments. In order to assess the paleontological resources of COLM, a field inventory was conducted from April to November 2023, visiting all previously reported fossil sites and documenting new localities. A total of 226 paleontological localities were verified during this fieldwork, of which nearly two-thirds (146 sites) were newly documented. Two more were discovered in March 2024. These 228 localities are distributed throughout much of the monument and many of the geologic units, with higher concentrations present in certain units (e.g., the Morrison Formation). Fieldwork was supplemented by the review of published and gray literature and assessment of COLM paleontological collections. A number of significant paleontological discoveries were made during this inventory, including the first documented fossils (dinosaur tracks, plant fossils, and dinosaur skin) from the Naturita Formation within COLM and multiple novel fossil occurrences (e.g., likely the oldest-known fish otoliths in North America and possibly one of the only Jurassic ankylosaur tracks known globally). When considered alongside previously identified significant fossil finds from COLM (e.g., one of only three known turtle tracksites in the Morrison Formation and potentially one of the only known lizard trackways in the same unit), the paleontological resources of the monument are of high scientific importance. Future research on the paleontological resources of COLM has a high potential for identifying important fossil specimens and/or describing new species. This report provides foundational data on the scope, significance, and distribution of paleontological resources at COLM and provides recommendations to support the management, interpretation, and research of these resources.

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Shaffer, Austin, Justin Tweet et Vincent Santucci. Colorado National Monument : Paleontological resource inventory (public version). National Park Service, 2024. http://dx.doi.org/10.36967/2303613.

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Colorado National Monument (COLM) in western Colorado was established on May 24, 1911 with the purpose of preserving, understanding, and enjoying the natural and cultural resources of the landscape, focusing on the history, erosional processes, and geology present. Although not explicitly mentioned in the monument?s purpose statement, the paleontological resources of COLM are nevertheless important. Significant fossils have been known from the area since the late 19th and early 20th centuries, and from COLM specifically within a few decades of the monument?s founding. The direct urban interface of COLM with Colorado?s Grand Valley provides unique management concerns for fossils and other resources of the monument. While COLM preserves a long geologic history (roughly 1.7 billion years ago to the present), the fossils preserved at the monument mostly come from sedimentary rocks of the Mesozoic Era. The paleontological resources of COLM include both body fossils and trace fossils of a wide variety of organisms (e.g., freshwater mussels, dinosaurs, plants) representing diverse paleoenvironments. In order to assess the paleontological resources of COLM, a field inventory was conducted from April to November 2023, visiting all previously reported fossil sites and documenting new localities. A total of 226 paleontological localities were verified during this fieldwork, of which nearly two-thirds (146 sites) were newly documented. Two more were discovered in March 2024. These 228 localities are distributed throughout much of the monument and many of the geologic units, with higher concentrations present in certain units (e.g., the Morrison Formation). Fieldwork was supplemented by the review of published and gray literature and assessment of COLM paleontological collections. A number of significant paleontological discoveries were made during this inventory, including the first documented fossils (dinosaur tracks, plant fossils, and dinosaur skin) from the Naturita Formation within COLM and multiple novel fossil occurrences (e.g., likely the oldest-known fish otoliths in North America and possibly one of the only Jurassic ankylosaur tracks known globally). When considered alongside previously identified significant fossil finds from COLM (e.g., one of only three known turtle tracksites in the Morrison Formation and potentially one of the only known lizard trackways in the same unit), the paleontological resources of the monument are of high scientific importance. Future research on the paleontological resources of COLM has a high potential for identifying important fossil specimens and/or describing new species. This report provides foundational data on the scope, significance, and distribution of paleontological resources at COLM and provides recommendations to support the management, interpretation, and research of these resources.

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Studies of the early Mesozoic Basins of the Eastern United States. US Geological Survey, 1988. http://dx.doi.org/10.3133/b1776.

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Petrogenesis of early Mesozoic Tholeiite in the Florida basement and an overview of Florida basement geology. Florida Geological Survey, 1988. http://dx.doi.org/10.35256/ri97.

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