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Author
Physical Desc
1 videodisc (74 min.) : digital ; 4 3/4 in.
Language
English
Description
"During the greatest biodiversity crisis in the history of life some 250 million years ago, over 90% of all the species in the oceans died off in just a few hundred thousand years. Douglas Erwin, author of the new book Extinction: How Life on Earth Nearly Ended 250 Million Years Ago, discusses his research in China, South Africa, and the western U.S. in search of the causes and consequences of this great mass extinction" -- container back cover.
Author
Series
Physical Desc
xvi, 296 pages : illustrations ; 22 cm.
Language
English
Description
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...
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