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Comment on “Whole-genome analyses resolve early branches in the tree of life of modern birds”

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Science  25 Sep 2015:
Vol. 349, Issue 6255, pp. 1460
DOI: 10.1126/science.aab1062

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Jarvis et al. (Research Articles, 12 December 2014, p. 1320) presented molecular clock analyses that suggested that most modern bird orders diverged just after the mass extinction event at the Cretaceous-Paleogene boundary (about 66 million years ago). We demonstrate that this conclusion results from the use of a single inappropriate maximum bound, which effectively precludes the Cretaceous diversification overwhelmingly supported by previous molecular studies.

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