Research NewsPaleontology

When Evolution Surges Ahead

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Science  24 Oct 1997:
Vol. 278, Issue 5338, pp. 577
DOI: 10.1126/science.278.5338.577

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While paleontologists debate whether the evolutionary turnover of species ever slows toward stasis (see main text), many studies of ancient marine animals show that every few million years, it can speed up dramatically. Now the question is what triggers these surges.