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Discontinuities in the Fossil Record | Evolution News
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Paleontologist James Valentine dies at 96
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James Valentine, paleontologist who grappled with the origin of animal diversity, has died at 96
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The Shiva Hypothesis: Is there a Rhythm to Cataclysmic Mass Extinction Events?
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An Underwater Revolution Millions of Years Ago Rewrote The Script of The Ocean
13 MARCH 2021
Look far enough back in time, and a pattern may emerge. After studying thousands of ancient fossils, paleontologist Jack Sepkoski identified just such a thing in 1981: an epic sequence of life and death, etched into the skeletons of the last 500 million years.
The late Sepkoski, a professor at the University of Chicago, discovered what became known as the three great evolutionary faunas of marine animals – a trio of successive explosions in biodiversity in the ocean over the course of the Phanerozoic Eon.
These giant bloomings of marine life were bookended by catastrophes of world-changing scale: extinction-level events precipitating mass animal die-offs – simultaneously clearing the stage for new creatures to emerge and prosper in the spaces they left behind.