Understanding Late Devonian And Permian Triassic Biotic And Climatic Events

Download Read Online Understanding Late Devonian And Permian Triassic Biotic And Climatic Events book
Author: Jeff Over
Publisher: Elsevier
ISBN: 9780080457840
Size: 62.65 MB
Format: PDF, Docs
View: 3682

Understanding Late Devonian And Permian Triassic Biotic And Climatic Events by Jeff Over


Original Title: Understanding Late Devonian And Permian Triassic Biotic And Climatic Events

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

Download Read Online When The Invasion Of Land Failed book
Author: George R. McGhee, Jr.
Publisher: Columbia University Press
ISBN: 0231536364
Size: 13.60 MB
Format: PDF, ePub, Mobi
View: 1600

When The Invasion Of Land Failed by George R. McGhee, Jr.


Original Title: When The Invasion Of Land Failed

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.

Understanding Earth S Deep Past

Download Read Online Understanding Earth S Deep Past book
Author: National Research Council
Publisher: National Academies Press
ISBN: 0309209196
Size: 18.68 MB
Format: PDF, ePub
View: 3110

Understanding Earth S Deep Past by National Research Council


Original Title: Understanding Earth S Deep Past

There is little dispute within the scientific community that humans are changing Earth's climate on a decadal to century time-scale. By the end of this century, without a reduction in emissions, atmospheric CO2 is projected to increase to levels that Earth has not experienced for more than 30 million years. As greenhouse gas emissions propel Earth toward a warmer climate state, an improved understanding of climate dynamics in warm environments is needed to inform public policy decisions. In Understanding Earth's Deep Past, the National Research Council reports that rocks and sediments that are millions of years old hold clues to how the Earth's future climate would respond in an environment with high levels of atmospheric greenhouse gases. Understanding Earth's Deep Past provides an assessment of both the demonstrated and underdeveloped potential of the deep-time geologic record to inform us about the dynamics of the global climate system. The report describes past climate changes, and discusses potential impacts of high levels of atmospheric greenhouse gases on regional climates, water resources, marine and terrestrial ecosystems, and the cycling of life-sustaining elements. While revealing gaps in scientific knowledge of past climate states, the report highlights a range of high priority research issues with potential for major advances in the scientific understanding of climate processes. This proposed integrated, deep-time climate research program would study how climate responded over Earth's different climate states, examine how climate responds to increased atmospheric carbon dioxide and other greenhouse gases, and clarify the processes that lead to anomalously warm polar and tropical regions and the impact on marine and terrestrial life. In addition to outlining a research agenda, Understanding Earth's Deep Past proposes an implementation strategy that will be an invaluable resource to decision-makers in the field, as well as the research community, advocacy organizations, government agencies, and college professors and students.

National Symposium Role Of Earth Sciences In Integrated Development And Related Societal Issues 2 4 November 2001 Lucknow

Download Read Online National Symposium Role Of Earth Sciences In Integrated Development And Related Societal Issues 2 4 November 2001 Lucknow book
Author: Geological Survey of India
Publisher:
ISBN:
Size: 57.28 MB
Format: PDF, Kindle
View: 6837

National Symposium Role Of Earth Sciences In Integrated Development And Related Societal Issues 2 4 November 2001 Lucknow by Geological Survey of India


Original Title: National Symposium Role Of Earth Sciences In Integrated Development And Related Societal Issues 2 4 November 2001 Lucknow

Contributed articles; papers presented at the symposium.

Recent Books :