Early animals out in the cold

Jochen J. Brocks and Nicholas J. Butterfield
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Jochen J. Brocks: Jochen J. Brocks is at the Research School of Earth Sciences, and the Centre for Macroevolution and Macroecology, the Australian National University, Canberra, 0200 ACT, Australia. jochen.brocks@anu.edu.au
Nicholas J. Butterfield: University of Cambridge, Cambridge CB2 3EQ, UK. njb1005@cam.ac.uk

Nature, 2009, vol. 457, issue 7230, 672-673

Abstract: The enduring controversy about the appearance of animals in the evolutionary record takes a fresh twist with an analysis of molecular fossils that places the rise of the sponge lineage before 635 million years ago.

Date: 2009
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DOI: 10.1038/457672a

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