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Vol 457 | 5 February 2009 | doi:nature07673 LETTERS Fossil steroids record the appearance of Demospongiae during the Cryogenian period Gordon D. Love1,2, Emmanuelle Grosjean3, Charlotte Stalvies4, David A. Fike5
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Document Date: 2010-10-07 18:20:31
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Vol 457 | 5 February 2009 | doi:nature07673 LETTERS Fossil steroids record the appearance of Demospongiae during the Cryogenian period Gordon D. Love1,2, Emmanuelle Grosjean3, Charlotte Stalvies4, David A. Fike5