Extinction, How Life on Earth Nearly Ended 250 Million Years Ago Douglas H. Erwin

Name: Extinction, How Life on Earth Nearly Ended 250 Million Years Ago Douglas H. Erwin
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Autor	Douglas H. Erwin
Uvez	Tvrdi s omotom
Izdavač	Princeton University Press
Godina izdavanja	2015
Stranica	296
Stanje	Rabljeno / Odlično očuvano 10/10
Jezik	Engleski

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Extinction, How Life on Earth Nearly Ended 250 Million Years Ago Douglas H. Erwin

Some 250 million years ago, the earth suffered the greatest biological crisis in its history. Around 95 percent of all living species died out?a global catastrophe far greater than the dinosaurs' demise 185 million years later. How this happened remains a mystery. But there are many competing theories. Some blame huge volcanic eruptions that covered an area as large as the continental United States; others argue for sudden changes in ocean levels and chemistry, including burps of methane gas; and still others cite the impact of an extraterrestrial object, similar to what caused the dinosaurs' extinction.

Extinction is a paleontological mystery story. Here, the world's foremost authority on the subject provides a fascinating overview of the evidence for and against a whole host of hypotheses concerning this cataclysmic event that unfolded at the end of the Permian.

After setting the scene, Erwin introduces the suite of possible perpetrators and the types of evidence paleontologists seek. He then unveils the actual evidence--moving from China, where much of the best evidence is found; to a look at extinction in the oceans; to the extraordinary fossil animals of the Karoo Desert of South Africa. Erwin reviews the evidence for each of the hypotheses before presenting his own view of what happened.

Although full recovery took tens of millions of years, this most massive of mass extinctions was a powerful creative force, setting the stage for the development of the world as we know it today.