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Some 250 million years ago, the earth suffered the greatest biological crisis in its history. Around 95% of all living species died out--a global catastrophe far greater than the dinosaurs' demise 65 million years ago. 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.

Born to humble parents, Smith was also a child of the Industrial Revolution (the year of his birth, 1769, also saw Josiah Wedgwood open his great factory, Etruria, Richard Arkwright create his first water-powered cotton-spinning frame, and James Watt receive the patent for the first condensing steam engine). While working as surveyor in a coal mine, Smith noticed the abrupt changes in the layers of rock as he was lowered into the depths. He came to understand that the different layers--in part as revealed by the fossils they contained--always appeared in the same order, no matter where they were found. He also realized that geology required a three-dimensional approach. Smith spent the next 20 some years traveling throughout Britain, observing the land, gathering data, and chattering away about his theories to those he met along the way, thus acquiring the nickname "Strata Smith." In 1815 he published his masterpiece: an 8.5- by 6-foot, hand-tinted map revealing "A Delineation of the Strata of England and Wales."

Despite this triumph, Smith's road remained more rocky than smooth. Snubbed by the gentlemanly Geological Society, Smith complained that "the theory of geology is in the possession of one class of men, the practice in another." Indeed, some members of the society went further than mere ostracism--they stole Smith's work. These cartographic plagiarists produced their own map, remarkably similar to Smith's, in 1819. Meanwhile the chronically cash-strapped Smith had been forced to sell his prized fossil collection and was eventually consigned to debtor's prison.