According to two UC Berkeley physicists (that’s right, not paleontologists) who have analyzed fossil records going back to the Pre-Cambrian, they have concluded that extinctions on Earth happen with startling regularity. According to this article in the San Francisco Chronicle, the cycles are so clear that the evidence “simply jumps out of the data,” said James Kirchner, a professor of earth and planetary sciences on the Berkeley campus who was not involved in the research but who has written a commentary on the report that is also appearing in Nature today.
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Edit by Dave (03/13) - Here is a link to a news release from Lawrence Berkeley Laboratories.
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