Search Results for: the late devonian mass extinction

The Late Devonian Mass Extinction

The Late Devonian Mass Extinction PDF
Author: George R. McGhee
Publisher:
Size: 50.71 MB
Format: PDF, Kindle
Category : Science
Languages : en
Pages : 303
View: 2762

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The Late Devonian Mass Extinction Book Description

by George R. McGhee, The Late Devonian Mass Extinction Books available in PDF, EPUB, Mobi Format. Download The Late Devonian Mass Extinction books, "Based on two decades of research, The Late Devonian Mass Extinction reviews the many theories that have been presented to explain the global mass extinction that struck the earth over 367 million years ago, considering in particular the possibility that the extinction was triggered by multiple impacts of extraterrestrial objects."--Publisher's description.


Understanding Late Devonian And Permian Triassic Biotic And Climatic Events

Understanding Late Devonian and Permian Triassic Biotic and Climatic Events PDF
Author: Jeff Over
Publisher: Elsevier
Size: 73.77 MB
Format: PDF
Category : Science
Languages : la
Pages : 344
View: 1671

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Understanding Late Devonian And Permian Triassic Biotic And Climatic Events Book Description

by Jeff Over, Understanding Late Devonian And Permian Triassic Biotic And Climatic Events Books available in PDF, EPUB, Mobi Format. Download Understanding Late Devonian And Permian Triassic Biotic And Climatic Events books, The Late Devonian and Permian-Triassic intervals are among the most dynamic episodes of Earth history, marked by large secular changes in continental ecosystems, dramatic fluctuations in ocean oxygenation, major phases of biotic turnover, volcanism, bolide impact events, and rapid fluctuations in stable isotope systems and sea level. This volume highlights contributions from a broad range of geological sub-disciplines currently striving to understand these critical intervals of geologically rapid, global-scale changes. * Provides updated, current models for the mid-Late Devonian and Permian-Triassic mass extinction episodes * Highlights several new analytical approaches for developing quantitative datasets * Takes an integrated approach presenting datasets from a broad range of sub-disciplines


When The Invasion Of Land Failed

When the Invasion of Land Failed PDF
Author: George R. McGhee Jr.
Publisher: Columbia University Press
Size: 16.42 MB
Format: PDF
Category : Science
Languages : en
Pages : 336
View: 5938

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When The Invasion Of Land Failed Book Description

by George R. McGhee Jr., When The Invasion Of Land Failed Books available in PDF, EPUB, Mobi Format. Download When The Invasion Of Land Failed books, The invasion of land by ocean-dwelling plants and animals was one of the most revolutionary events in the evolution of life on Earth, yet the animal invasion almost failed—twice—because of the twin mass extinctions of the Late Devonian Epoch. Some 359 to 375 million years ago, these catastrophic events dealt our ancestors a blow that almost drove them back into the sea. If those extinctions had been just a bit more severe, spiders and insects—instead of vertebrates—might have become the ecologically dominant forms of animal life on land. This book examines the profound evolutionary consequences of the Late Devonian extinctions and the various theories proposed to explain their occurrence. Only one group of four-limbed vertebrates exists on Earth, while other tetrapod-like fishes are extinct. This gap is why the idea of "fish with feet" seems so peculiar to us, yet such animals were once a vital part of our world, and if the Devonian extinctions had not happened, members of these species, like the famous Acanthostega and Ichthyostega, might have continued to live in our rivers and lakes. Synthesizing decades of research and including a wealth of new discoveries, this accessible, comprehensive text explores the causes of the Devonian extinctions, the reasons vertebrates were so severely affected, and the potential evolution of the modern world if the extinctions had never taken place.


Mass Extinction

Mass Extinction PDF
Author: Ashraf M.T. Elewa
Publisher: Springer Science & Business Media
Size: 41.20 MB
Format: PDF, Docs
Category : Science
Languages : en
Pages : 252
View: 6812

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Mass Extinction Book Description

by Ashraf M.T. Elewa, Mass Extinction Books available in PDF, EPUB, Mobi Format. Download Mass Extinction books, The present book combines three main aspects: five major mass extinctions; contributions on some other minor extinctions; and more importantly contributions on the current mass extinction. All three aspects are introduced through interesting studies of mass extinctions in diverse organisms ranging from small invertebrates to mammals and take account of the most accepted subjects discussing mass extinctions in insects, mammals, fishes, ostracods and molluscs.


Re Evaluating The Late Devonian Mass Extinction

Re evaluating the Late Devonian Mass Extinction PDF
Author: Kelly N. Hillbun
Publisher:
Size: 66.96 MB
Format: PDF
Category : Chemostratigraphy
Languages : un
Pages : 266
View: 2115

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Re Evaluating The Late Devonian Mass Extinction Book Description

by Kelly N. Hillbun, Re Evaluating The Late Devonian Mass Extinction Books available in PDF, EPUB, Mobi Format. Download Re Evaluating The Late Devonian Mass Extinction books, The primary goal of this dissertation is to increase understanding of the so-called Late Devonian mass extinction through the use of stable isotope geochemistry. Despite decades of research, the timing, cause(s), and extent of the events surrounding this devastating interval in Earth history remain poorly understood. One of the best places to study the Devonian period is the Lennard Shelf in the Canning Basin of Western Australia. This region contains extensive, well-preserved exposures of Middle and Upper Devonian (Givetian, Frasnian, and Famennian) carbonate reefal platforms and slopes that are ideal for geochemical analyses. A significant amount of information could be learned about the Late Devonian mass extinction in the Canning Basin if we had a detailed chronostratigraphic framework of platform to basin strata and a better understanding of the paleoenvironmental conditions during the Upper Devonian. This research aims to use stable isotope chemostratigraphy to help build a high resolution chronostratigraphy and examine any environmental changes leading up to and following the F-F boundary that may have contributed to Devonian extinction events in the Canning Basin. This dissertation is divided into two parts; the first concerns my research on the Late Devonian mass extinction while the second is ancillary and documents my astrobiology research rotation. Part 1 contains introductory and concluding remarks as well as three chapters written as scientific manuscripts that have been, or will soon be, submitted for journal publication. The first of these three chapters examines the local and global controls on carbon isotope chemostratigraphy in the Lennard Shelf system to validate the use of secular variations as a chronostratigraphic tool for regional and global correlations. The next chapter provides a detailed, expanded view of the F-F boundary and constrains the pattern of carbon isotope perturbations across said boundary at the intra-zonal scale. The third scientific chapter broadens focus from the F-F to the entirely of the Upper Devonian and presents the first carbon isotope composite curve from Western Australia that is used to test the global nature (timing and extent) of Late Devonian events and examine the relationship between carbon isotope fluctuations, faunal turnover, and changes in the paleoenvironment (sea level, climate, ocean chemistry, paleogeography). Results from Part 1 not only have implications for re-evaluating one of the "Big Five" mass extinctions in the Phanerozoic, but are also relevant to studies in astrobiology and have additional applications in the oil and gas industry. The final chapter of my dissertation, which is in Part 2, concerns interdisciplinary, astrobiology work done during summer quarter, 2014, that was devoted to analyzing the relationship between astronomy and geology circa 1770-1810. This chapter is included in my dissertation as partial fulfillment of my dual-title astrobiology degree.


When The Invasion Of Land Failed

When the Invasion of Land Failed PDF
Author: George R. McGhee, Jr.
Publisher: Columbia University Press
Size: 22.91 MB
Format: PDF, Docs
Category : Science
Languages : un
Pages : 360
View: 4357

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When The Invasion Of Land Failed Book Description

by George R. McGhee, Jr., When The Invasion Of Land Failed Books available in PDF, EPUB, Mobi Format. Download When The Invasion Of Land Failed books, The invasion of land by ocean-dwelling plants and animals was one of the most revolutionary events in the evolution of life on Earth, yet the animal invasion almost failed—twice—because of the twin mass extinctions of the Late Devonian Epoch. Some 359 to 375 million years ago, these catastrophic events dealt our ancestors a blow that almost drove them back into the sea. If those extinctions had been just a bit more severe, spiders and insects might have become the ecologically dominant forms of animal life on land. This book examines the profound evolutionary consequences of the Late Devonian extinctions, which shaped the composition of the modern terrestrial ecosystem. Only one group of four-limbed vertebrates now live on Earth while other tetrapod-like fishes are extinct. This gap is why the idea of “fish with feet” seems so peculiar yet these animals were once a vital part of our world.


Carboniferous Giants And Mass Extinction

Carboniferous Giants and Mass Extinction PDF
Author: George R. McGhee Jr.
Publisher: Columbia University Press
Size: 37.65 MB
Format: PDF, ePub, Mobi
Category : Science
Languages : en
Pages : 304
View: 598

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Carboniferous Giants And Mass Extinction Book Description

by George R. McGhee Jr., Carboniferous Giants And Mass Extinction Books available in PDF, EPUB, Mobi Format. Download Carboniferous Giants And Mass Extinction books, Picture a world of dog-sized scorpions and millipedes as long as a car; tropical rainforests with trees towering over 150 feet into the sky and a giant polar continent five times larger than Antarctica. That world was not imaginary; it was the earth more than 300 million years ago in the Carboniferous period of the Paleozoic era. In Carboniferous Giants and Mass Extinction, George R. McGhee Jr. explores that ancient world, explaining its origins; its downfall in the end-Permian mass extinction, the greatest biodiversity crisis to occur since the evolution of animal life on Earth; and how its legacies still affect us today. McGhee investigates the consequences of the Late Paleozoic ice age in this comprehensive portrait of the effects of ancient climate change on global ecology. Carboniferous Giants and Mass Extinction examines the climatic conditions that allowed for the evolution of gigantic animals and the formation of the largest tropical rainforests ever to exist, which in time turned into the coal that made the industrial revolution possible—and fuels the engine of contemporary anthropogenic climate change. Exploring the strange and fascinating flora and fauna of the Late Paleozoic ice age world, McGhee focuses his analysis on the forces that brought this world to an abrupt and violent end. Synthesizing decades of research and new discoveries, this comprehensive book provides a wealth of insights into past and present extinction events and climate change.


The Frasnian Famennian Late Devonian Mass Extinction And Recovery Interval

The Frasnian Famennian  Late Devonian  Mass Extinction and Recovery Interval PDF
Author: John Frederick Bratton
Publisher:
Size: 39.69 MB
Format: PDF, Docs
Category : Cretaceous-Paleogene boundary
Languages : en
Pages : 522
View: 5233

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The Frasnian Famennian Late Devonian Mass Extinction And Recovery Interval Book Description

by John Frederick Bratton, The Frasnian Famennian Late Devonian Mass Extinction And Recovery Interval Books available in PDF, EPUB, Mobi Format. Download The Frasnian Famennian Late Devonian Mass Extinction And Recovery Interval books,


Reef Recovery Following The Late Devonian Mass Extinction Evidence From The Dugway Range West Central Utah

Reef Recovery Following the Late Devonian Mass Extinction  Evidence from the Dugway Range  West central Utah PDF
Author: Joseph G. Krivanek
Publisher:
Size: 42.49 MB
Format: PDF, ePub
Category :
Languages : un
Pages :
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Reef Recovery Following The Late Devonian Mass Extinction Evidence From The Dugway Range West Central Utah Book Description

by Joseph G. Krivanek, Reef Recovery Following The Late Devonian Mass Extinction Evidence From The Dugway Range West Central Utah Books available in PDF, EPUB, Mobi Format. Download Reef Recovery Following The Late Devonian Mass Extinction Evidence From The Dugway Range West Central Utah books, ABSTRACT: The biotic crisis of the Late Devonian Period involved three distinct peaks of extinction intensity and preferentially eliminated reef taxa. By the end of the second peak, the Frasnian-Famennian (F-F) boundary, the dominant constructor guild member of the mid-Paleozoic, the stromatoporoids, had ceased reef construction in most parts of the world. An undescribed stromatoporoid bioherm in the Dugway Range, west-central Utah, is one of the few locations where stromatoporoids continued building reefs into the mid-Famennian. The sections are well-constrained biostratigraphically using both conodonts and stromatoporoids and range from the latest Frasnian to the Early Carboniferous. The reefal faunas are depauperate and dominated by labechiids and stylostromids, as is characteristic of most Famennian bioconstructions. In this region, reefal development was episodic with reefal units interbedded with units lacking reef taxa. The stromatoporoid survivors belong to long-ranging clades, and may represent "extinction-resistant" taxa. Both were fairly minor constituents of Frasnian reef communities.


In The Light Of Evolution

In the Light of Evolution PDF
Author: National Academy of Sciences
Publisher: National Academies Press
Size: 19.56 MB
Format: PDF
Category : Science
Languages : en
Pages : 432
View: 719

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In The Light Of Evolution Book Description

by National Academy of Sciences, In The Light Of Evolution Books available in PDF, EPUB, Mobi Format. Download In The Light Of Evolution books, The current extinction crisis is of human making, and any favorable resolution of that biodiversity crisis--among the most dire in the 4-billion-year history of Earth--will have to be initiated by mankind. Little time remains for the public, corporations, and governments to awaken to the magnitude of what is at stake. This book aims to assist that critical educational mission, synthesizing recent scientific information and ideas about threats to biodiversity in the past, present, and projected future. This is the second volume from the In the Light of Evolution series, based on a series of Arthur M. Sackler colloquia, and designed to promote the evolutionary sciences. Each installment explores evolutionary perspectives on a particular biological topic that is scientifically intriguing but also has special relevance to contemporary societal issues or challenges. Individually and collectively, the ILE series aims to interpret phenomena in various areas of biology through the lens of evolution, address some of the most intellectually engaging as well as pragmatically important societal issues of our times, and foster a greater appreciation of evolutionary biology as a consolidating foundation for the life sciences.