Download or read book The Palynology of the Triassic Dockum Group of Texas and Its Application to Stratigraphic Problems of the Dockum Group written by Robert E. Dunay and published by . This book was released on 1977 with total page 740 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Dawn of the Age of Dinosaurs in the American Southwest written by Spencer G. Lucas and published by New Mexico Museum of Natural History and Science. This book was released on 1989 with total page 445 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Nonmarine Triassic written by Spencer G. Lucas and published by New Mexico Museum of Natural History and Science. This book was released on with total page 522 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Depositional Environments Sedimentology and Stratigraphy of the Dockum Group Triassic in the Texas Panhandle written by Brent A. May and published by . This book was released on 1988 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Genetic Stratigraphy of the Dockum Group Triassic Palo Duro Canyon Panhandle Texas written by Steven J. Seni and published by . This book was released on 1978 with total page 350 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Triassic Dockum Group is a complex assemblage of lacustrine, deltaic, and fluvial facies. Excellent exposures of these rocks were studied in and around Palo Duro State Park where the Prairie Dog Town Fork of the Red River and its tributaries have carved a network of steep-walled canyons. Three-dimensional exposures of the Dockum have permitted study of lateral as well as vertical facies relationships. Three progradational genetic sequences were delineated within the study area. A genetic sequence consists in ascending order of: lacustrine mudstone, deltaic siltstone-sandstone-conglomerate, and fluvial sandstone-conglomerate. The following three lines of evidence indicate that complex base-level changes, caused by fluctuations in lake area and depth, occurred during deposition of the Dockum Group. Within the first genetic sequence burrowed lacustrine mudstones are interbedded with caliche horizons. These caliche horizons contain discrete burrowed and pisolitic carbonate nodules that are composed of microspar calcite, sparry calcite, and minor dolomite. Silicified evaporite nodules occur at the base of this unit. The second genetic sequence comprises a progradational lacustrine delta system which was truncated by a valley-fill system which formed in response to diminished lake depth and area. The valley-fill system comprises a transgressive fluvial-deltaic-lacustrine sequence encased within an overall progradational sequence. The third genetic sequence is composed of classic "Gilbert-type" lacustrine deltas with prominent foreset beds indicating deposition in 8 to 15 m of water. Ephemeral lakes characterized the first and second progradational sequences. Lacustrine fan deltas formed in water 1 to 10 m deep. The third progradational sequence was deposited in more continuously deep-water (10-20 m) lakes. A vertical sequence through Dockum Group rocks reveals a change from alternating humid and arid conditions of the first and second progradational sequences toward continuously humid conditions which prevailed during deposition of the third progradational sequence.

Download or read book The Beginning of the Age of Dinosaurs written by Kevin Padian and published by Cambridge University Press. This book was released on 1988-09-30 with total page 406 pages. Available in PDF, EPUB and Kindle. Book excerpt: Around 210 million years ago, life on Earth experienced sweeping changes. Many archaic reptiles and mammalian predecessors became extinct and were replaced by dinosaurs, pterosaurs, crocodiles, turtles, mammals, and essentially all of the major modern vertebrate groups except the birds. This period of change, which took place over a period of approximately five to ten million years, ushered in the beginning of the 'Age of Dinosaurs,' a period that lasted 160 million years to the end of the Cretaceous 65 million years ago. In the past decade, paleontologists have come to know a great deal more about this crucial interval of time. New discoveries, ideas, and insights from scientists in many related- disciplines have created new paradigms about the beginning of the 'Age of Dinosaurs.' What were the animals that preceded the dinosaurs like? How did the dinosaurs originate, and what do we know of their early history? Was their ascent tied to evolutionary innovations, global climatic and ecological changes, or just chance factors? How do paleontologists decide about the evidence preserved in the fossil record, and what areas now require major thought and reevaluation? In this book, 31 specialists in the paleontology of this era consider these and other questions related to Late Triassic and Early Jurassic times - the beginning of the 'Age of Dinosaurs,' its fauna, flora, climate, stratigraphic relationships, and major evolutionary changes. The book is divided into sections on background, Late Triassic taxa and faunas, changes across the boundary, Early Jurassic taxa and faunas, and major macroevolutionary patterns. This comprehensive volume is richly illustrated and is intended for students and professionals in the areas of paleontology, evolutionary biology, geology, and vertebrate zoology. Introductory and summary chapters are provided to acquaint the non-specialist with the issues and the setting of this interval of time in which the ancestral components of the modem fauna, as well as the Dinosauria, first appeared to rule the Earth.

Download or read book Lithogenetic Stratigraphy of the Triassic Dockum Formation Palo Duro Basin Texas written by David A. Johns and published by . This book was released on 1989 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Part 1 The Positions and Climatic Changes of Pangaea and Five Southeast Asian Plates During Permian and Triassic Times Gerhard O W Kremp Part 2 Twelve Hundred Annotated References Concerning the Upper Pennsylvanian to Triassic Literature in Palynology written by Gerhard Otto Wilhelm Kremp and published by . This book was released on 1977 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book ROTTEN HILL A LATE TRIASSIC BONEBED IN THE TEXAS PANHANDLE USA written by Spencer G. Lucas and published by New Mexico Museum of Natural History and Science. This book was released on 2016-01-01 with total page 105 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Stratigraphy and Environmental Significance of the Continental Triassic Rocks of Texas written by Ted Gawloski and published by . This book was released on 1981 with total page 482 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Palynology written by and published by . This book was released on 1981 with total page 854 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Aspects of Mesozoic Geology and Paleontology of the Colorado Plateau written by Michael Morales and published by . This book was released on 1993 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Petroleum Abstracts written by and published by . This book was released on 1993 with total page 1752 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Depositional Framework of the Lower Dockum Group Triassic Texas Panhandle written by J. H. McGowen and published by . This book was released on 1979 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Nonmarine Triassic written by and published by . This book was released on 1993 with total page 560 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Bibliography and Index of Texas Geology 1961 1974 written by Elizabeth T. Moore and published by . This book was released on 1976 with total page 464 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Depositional and Diagenetic History of the Late Triassic Dockum Group Young Ranch Nolan County Texas written by Jason P. Slayden and published by . This book was released on 2002 with total page 278 pages. Available in PDF, EPUB and Kindle. Book excerpt: