Fossil steroids record the appearance of Demospongiae during the Cryogenian period.
Love GD; Grosjean E; Stalvies C; Fike DA; Grotzinger JP; Bradley AS; Kelly AE; Bhatia M; Meredith W; Snape CE; Bowring SA; Condon DJ; Summons RE; Nature, 2009, vol. 457, issue 7230, p 718, ISSN 14764687. ISBN 14764687.

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