Download or read book Stratigraphy and paleobiology of the Upper Cretaceous Lower Paleogene sediments from the Trans Sahara Seaway in Mali written by Maureen A. O'Leary and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Stratigraphy and Paleobiology of the Upper Cretaceous Lower Paleogene Sediments from the Trans Saharan Seaway in Mali written by and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Stratigraphy and Paleobiology of the Upper Cretaceous Lower Paleogene Sediments from the Trans Saharan Seaway in Mali written by Maureen A. O'Leary and published by . This book was released on 2019 with total page 177 pages. Available in PDF, EPUB and Kindle. Book excerpt: An epicontinental sea bisected West Africa periodically from the Late Cretaceous to the early Eocene, in dramatic contrast to the current Sahara Desert that dominates the same region today. Known as the Trans-Saharan Seaway, this warm and shallow ocean was a manifestation of globally elevated sea level associated with the rapid break-up of the supercontinent Gondwana in the late Mesozoic. Although it varied in size through time, the Trans-Saharan Seaway is estimated to have covered as much as 3000 km2 of the African continent and was approximately 50 m deep. The edges of the sea were defined in part by the high topography of the Precambrian cratons and mobile belts of West Africa. Over its approximately 50 million year episodic existence, through six major periods of transgression and regression, the Trans-Saharan Seaway left behind extensive nearshore marine sedimentary strata with abundant fossils. The waters that yielded these deposits supported and preserved the remains of numerous vertebrate, invertebrate, plant, and microbial species that are now extinct. These species document a regional picture of ancient tropical life that spanned two major Earth events: the Cretaceous-Paleogene (K-Pg) boundary and the Paleocene-Eocene Thermal Maximum (PETM). Whereas extensive epeiric seas flooded the interior portions of most continents during these intervals, the emerging multicontinental narrative has often overlooked the Trans-Saharan Seaway, in part because fundamental research, including the naming of geological formations and the primary description and analysis of fossil species, remained to be done. We provide such synthesis here based on two decades of fieldwork and analyses of sedimentary deposits in the Republic of Mali. Northern parts of the Republic of Mali today include some of the farthest inland reaches of the ancient sea. We bring together and expand on our prior geological and paleontological publications and provide new information on ancient sedimentary rocks and fossils that document paleoequatorial life of the past. Ours is the first formal description of and nomenclature for the Upper Cretaceous and Lower Paleogene geological formations of this region and we tie these names to regional correlations over multiple modern territorial boundaries. The ancient seaway left intriguing and previously unclassified phosphate deposits that, quite possibly, represent the most extensive vertebrate macrofossil bone beds known from anywhere on Earth. These bone beds, and the paper shales and carbonates associated with them, have preserved a diverse assemblage of fossils, including a variety of new species of invertebrates and vertebrates, rare mammals, and trace fossils. The shallow marine waters included a wide range of paleoenvironments from delta systems, to hypersaline embayments, protected lagoons, and carbonate shoals. Our overarching goal has been to collect vertebrate fossils tied to a K-Pg stratigraphic section in Africa. We provide such a section and, consistent with prior ideas, indicate that there is a gap in sedimentation in Malian rocks in the earliest Paleocene, an unconformity also proposed elsewhere in West Africa. Our phylogenetic analyses of several vertebrate clades across the K-Pg boundary have clarified clade-by-clade species-level survivorship and range extensions for multiple taxa. Few macrofossil species from the Trans-Saharan Seaway show conspicuous change at either the K-Pg boundary or the PETM based on current evidence, although results are very preliminary. Building on our earlier report of the first record of rock-boring bivalves from the Paleocene of West Africa, we further describe here a Cretaceous and Paleogene mollusk fauna dominated by taxa characteristic of the modern tropics. Among the newly discovered fossil osteichthyans, large body size characterizes both the pycnodonts and a new freshwater Eocene catfish species, one of the largest fossil catfishes found in Africa. Our new paleoecological and faunal reconstructions show an evergreen, broadleaf forest that included some of the oldest mangroves known. The ancient Malian ecosystem had numerous apex predators including Crocodyliformes, Serpentes, and Amiidae, some of which were among the largest species in their clades. The Trans-Saharan Seaway exhibited intermittent isolation from major seas. This environmental variable may have created aquatic centers of endemism, stimulating selection for gigantism as previously observed for species on terrestrial islands.
Download or read book Stratigraphy and Micropaleontology of Some Late Cretaceous Paleocene Continental Formations Western Interior North America written by Robert Kenneth Germundson and published by . This book was released on 1965 with total page 213 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Stratigraphic Sections of Lower Cambrian and Upper Proterozoic Rocks in Nye Lander and Lincoln Counties Nevada and Sonora Mexico written by J. H. Stewart and published by . This book was released on 1984 with total page 118 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Late Paleozoic and Mesozoic Continental Sedimentation Northeastern North America written by Geological Society of America. Northeastern Section and published by Geological Society of America. This book was released on 2018 with total page 359 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Sequence Stratigraphy of the Lower Miocene Moghra Formation in the Qattara Depression North Western Desert Egypt written by Safiya M. Hassan and published by Springer Science & Business Media. This book was released on 2013-06-12 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Qattara Depression is part of the Northwestern Desert in Egypt and is home to the second lowest point in Africa at -133 meters below sea level. Therefore, before any projects can be carried out in this area, we must first understand the geology of the land. The present study deals with the high-resolution sequence stratigraphic analysis of the Lower Miocene Moghra Formation outcrops in the Qattara Depression Region. The literature on the sedimentology and sequence stratigraphy of the Moghra Formation has been sparse to date, despite some excellent work over the years by academic and petroleum workers. Moreover, the area studied is within what was once a front-line of World War II, where mine fields and war relics are scattered and cover wide reaches. This has resulted in limited geologic mapping in the past. Thus, great attention is paid in this study to establishing a robust sedimentology and high-resolution sequence stratigraphic framework for the Lower Miocene Moghra Formation. Included are works based on outcrops and, most importantly, new sedimentological and chronostratigraphic information not previously available.
Download or read book Stratigraphy and Micropaleontology of the Upper Cretaceous and Lower Tertiary of the North West Basin Australia written by Henry Stewart Edgell and published by . This book was released on 1954 with total page 1020 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Pre Cambrian in North Africa written by H. M. E. Schürmann and published by Brill Archive. This book was released on 1974 with total page 574 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Stratigraphy Structure and Possible Oil Resources of the Miocene Rocks of the Central Plain written by Wendell Phillips Woodring and published by . This book was released on 1922 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Stratigraphic Micropaleontology of Atlantic Basin and Borderlands written by and published by Elsevier. This book was released on 2011-08-26 with total page 613 pages. Available in PDF, EPUB and Kindle. Book excerpt: Stratigraphic Micropaleontology of Atlantic Basin and Borderlands
Download or read book Mesozoic and Cenozoic Sequence Stratigraphy of European Basins written by Pierre Charles de Graciansky and published by . This book was released on 1998 with total page 818 pages. Available in PDF, EPUB and Kindle. Book excerpt: This project was designed to build a documented chronostratigraphic and outcrop record of depositional sequences calibrated across European basins. Data on standard stages, magnetostratigraphy, and geochronology integrated with high resolution biostratigraphy calibrate the stratigraphic position of depositional sequence boundaries. Higher order eustatic sequences show a significant increase in the number identified. A good portion of the European Mesozoic and Cenozoic succession is set in the sequence stratigraphic context with a stratigraphic record of its bonding surfaces.
Download or read book Stratigraphic Revision of the Middle Eocene Oligocene and Lower Miocene Atlantic Coastal Plain of North Carolina written by Lauck W. Ward and published by . This book was released on 1978 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: See journals under US Geological survey. Bulletin, no. 1457-F.
Download or read book The Stratigraphic History of Africa South of the Sahara written by Sidney Henry Haughton and published by . This book was released on 1963 with total page 442 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book New Insights into the Stratigraphic Setting of Paleozoic to Miocene Deposits written by Gemma Aiello and published by BoD – Books on Demand. This book was released on 2019-05-29 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book contains four chapters dealing with the investigation of facies analysis and paleoecology, chemostratigraphy, and chronostratigraphy referring to paleoecological and facies analysis techniques and methodologies. The chapters pertain in particular to Oligo-Miocene carbonate succession of the Persian Gulf (Asmari Formation), the chemostratigraphy of Paleozoic carbonates of Peninsular Malaysia through the integration of stratigraphic, sedimentologic, and geochemical data, and the chronostratigraphy of a small ice-dammed paleolake in Andorra (Spain), applying fast Fourier transform analysis, resulting in 6th-order stratigraphic cycles, which have outlined the occurrence of system tracts and unconformities controlled by glacio-eustasy. The chapters are separated into four main sections: (1) introduction; (2) facies analysis and paleoecology; (3) chemostratigraphy; and (4) chronostratigraphy. There is one chapter in the first section introducing the stratigraphic setting of Paleozoic to Miocene deposits based on different stratigraphic methodologies, including facies analysis, paleoecology, chemostratigraphy, and chronostratigraphy. In the second section, there is one chapter dealing with the Oligocene-Miocene Asmari Formation, allowing for the recognition of several depositional environments based on sedimentological analysis, distribution of foraminifera, and micropaleontological study. In the third section, there is one chapter aimed at addressing research on the chemostratigraphy of cores, allowing for a significant increase of the stratigraphic knowledge existing on the Kinta Valley (Malaysia), coupled with extensive fieldwork on Paleozoic carbonates. In the fourth section, there is a chapter dealing with the high-resolution chronostratigraphic setting of a paleolake located in Andorra (Spain) and the inference with the MIS2 isotopic stage of Atlantic and Mediterranean regions in the regional geological setting of the southeastern Pyrenees.
Download or read book Stratigraphy Paleoeconomy and Environment written by Fred Wendorf and published by . This book was released on 1989 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Stratigraphy Petrography and Provenance of the Upper Cretaceous Paleocene Formations of the Middle Indus Basin Pakistan written by Muzaffer Sultan and published by . This book was released on 1997 with total page 510 pages. Available in PDF, EPUB and Kindle. Book excerpt:
