Dodging snowballs: Geochronology of the Gaskiers glaciation and the first appearance of the Ediacaran biota

  title={Dodging snowballs: Geochronology of the Gaskiers glaciation and the first appearance of the Ediacaran biota},
  author={Judy P Pu and Samuel A. Bowring and Jahandar Ramezani and Paul M. Myrow and Timothy D. Raub and Ed Landing and Andrea Mills and Eben Blake Hodgin and Francis A. Macdonald},
The snowball Earth hypothesis predicts that low-latitude glaciation lasted millions of years while CO2 built up to critical levels to culminate in catastrophic deglaciation in a supergreenhouse climate. The Gaskiers Formation of eastern Newfoundland (Canada) has been attributed to a snowball glaciation event, but the lack of robust paleomagnetic data and precise geochronological constraints has precluded tests of the hypothesis. Here we present high-precision U-Pb zircon geochronology (chemical… 

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