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Early animals out in the cold
Brocks, J.J.; Butterfield, N.J. (2009). Early animals out in the cold. Nature (Lond.) 457(7230): 672-673
In: Nature: International Weekly Journal of Science. Nature Publishing Group: London. ISSN 0028-0836, more
Peer reviewed article  

Available in  Authors 

Keyword
    Marine

Authors  Top 
  • Brocks, J.J.
  • Butterfield, N.J.

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.

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