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% 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.
By:
Tony Hallam ( Emeritus Professor of Geology University of Birmingham) Imprint: Oxford University Press Country of Publication: United Kingdom Dimensions:
Height: 196mm,
Width: 130mm,
Spine: 13mm
Weight: 260g ISBN:9780192806680 ISBN 10: 0192806688 Pages: 240 Publication Date:01 February 2006 Audience:
General/trade
,
Professional and scholarly
,
ELT Advanced
,
Undergraduate
Format:Paperback Publisher's Status: Active
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
Tony Hallam is Emeritus Professor of Geology at the University of Birmingham and the author of several books on geology.
Reviews for Catastrophes and Lesser Calamities: The causes of mass extinctions
` an excellent concise account of the evidence for both major and minor mass extinctions ' Tony Hallam, Chemistry & Industry