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Catastrophes and Lesser Calamities: The Causes of Mass Extinctions

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Catastrophes and Lesser Calamities

The Causes of Mass Extinctions

By Tony Hallam

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Format: Paperback, 240 pages
Other Information: numerous figures, halftones and 1 map
Published In: United Kingdom, 14 July 2005
This is a book about the dramatic periods in the Earth's history called mass extinctions - short periods (by geological standards) when life nearly died out on Earth. The most famous is the mass extinction that happened about 65 million years ago, and that caused the death of the dinosaurs. But that was not the worst mass extinction: that honour goes to the extinction at the end of the Permian Period, about 250 million years ago, when over 90 per cent of life is thought to have become extinct. What caused these catastrophes? Was it the effects of a massive meteorite impact? There is evidence for such an impact about 65 million years ago. Or was it a period of massive volcanic activity? There is evidence in the rocks of huge lava flows at periods that match several of the mass extinctions. Was it something to do with climate change and sea level? Or was it a combination of some or all of these? The question has been haunting geologists for a number of years, and it forms one of the most exciting areas of research in geology today. In this book, Tony Hallam, a distinguished geologist and writer, looks at all the different theories and also what the study of mass extinctions might tell us about the future. If climate change is a key factor, we may well, as some scientists have suggested, be in a period of mass extinction of our own making.

Table of Contents

1. In search of possible causes of mass extinctions ; 2. Historical background ; 3. Evidence for catastrophic organic changes in the geological record ; 4. Impact by comets and asteroids ; 5. Sea-level changes ; 6. Oxygen deficiency in the oceans ; 7. Climate change ; 8. Volcanic activity ; 9. Pulling the strands together ; 10. The evolutionary significance of mass extinctions ; 11. The influence of humans ; Notes and suggestions for further reading ; References ; Glossary ; Index ; 1. In search of possible causes of mass extinctions ; 2. Historical background ; 3. Evidence for catastrophic organic changes in the geological record ; 4. Impact by comets and asteroids ; 5. Sea-level changes ; 6. Oxygen deficiency in the oceans ; 7. Climate change ; 8. Volcanic activity ; 9. Pulling the strands together ; 10. The evolutionary significance of mass extinctions ; 11. The influence of humans ; Notes and suggestions for further reading ; References ; Glossary ; Index

About the Author

Tony Hallam is Emeritus Professor of Geology at the University of Birmingham and the author of several books on geology.

Reviews

Compelling book... * Maty Cartmill, TLS *

EAN: 9780192806680
ISBN: 0192806688
Publisher: Oxford University Press
Dimensions: 19.76 x 12.75 x 1.24 centimetres (0.32 kg)
Age Range: 15+ years
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