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1: Science. 2005 Apr 1;308(5718):95-8. Epub 2005 Feb 24.Click here to read Links
Comment in:
Science. 2005 Apr 1;308(5718):59-60.

U-Pb ages from the neoproterozoic Doushantuo Formation, China.

Condon D, Zhu M, Bowring S, Wang W, Yang A, Jin Y.

Department of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139, USA. dcondon@mit.edu

U-Pb zircon dates from volcanic ash beds within the Doushantuo Formation (China) indicate that its deposition occurred between 635 and 551 million years ago. The base records termination of the global-scale Marinoan glaciation and is coeval with similar dated rocks from Namibia, indicating synchronous deglaciation. Carbon isotopic and sequence-stratigraphic data imply that the spectacular animal fossils of the Doushantuo Formation are for the most part younger than 580 million years old. The uppermost Doushantuo Formation contains a pronounced negative carbonate carbon isotopic excursion, which we interpret as a global event at circa 551 million years ago.

PMID: 15731406 [PubMed - indexed for MEDLINE]

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