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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, John P. Grotzinger5,
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Document Date: 2009-02-03 10:38:36
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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, John P. Grotzinger5,