Asteroceras, a Jurassic ammonite from England.(Credit: Courtesy of Wikimedia Commons)
From Science Daily:
ScienceDaily (Sep. 14, 2009) — After the End-Permian extinction 252.6 million years ago, ammonoids diversified and recovered 10 to 30 times faster than previous estimates. The surprising discovery raises questions about paleontologists' understanding of the dynamics of evolution of species and the functioning of the biosphere after a mass extinction.
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