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U-Pb Ages from the Neoproterozoic Doushantuo Formation, China
Daniel Condon,1*Maoyan Zhu,2Samuel Bowring,1Wei Wang,2Aihua Yang,2Yugan Jin2
U-Pb zircon dates from volcanic ash beds within the DoushantuoFormation (China) indicate that its deposition occurred between635 and 551 million years ago. The base records terminationof the global-scale Marinoan glaciation and is coeval with similardated rocks from Namibia, indicating synchronous deglaciation.Carbon isotopic and sequence-stratigraphic data imply that thespectacular animal fossils of the Doushantuo Formation are forthe most part younger than 580 million years old. The uppermostDoushantuo Formation contains a pronounced negative carbonatecarbon isotopic excursion, which we interpret as a global eventat circa 551 million years ago.
1 Department of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139, USA. 2 Nanjing Institute of Geology and Paleontology, Chinese Academy of Sciences, Nanjing 210008, China.
* To whom correspondence should be addressed. E-mail: dcondon{at}mit.edu
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