Calibrating the Cryogenian.

@article{Macdonald2010CalibratingTC,
  title={Calibrating the Cryogenian.},
  author={Francis A Macdonald and Mark D. Schmitz and James L. Crowley and Charles F Roots and D. S. Jones and Adam C Maloof and Justin V Strauss and Phoebe A. Cohen and David T. Johnston and Daniel P. Schrag},
  journal={Science},
  year={2010},
  volume={327 5970},
  pages={1241-3}
}
The Neoproterozoic was an era of great environmental and biological change, but a paucity of direct and precise age constraints on strata from this time has prevented the complete integration of these records. We present four high-precision U-Pb ages for Neoproterozoic rocks in northwestern Canada that constrain large perturbations in the carbon cycle, a major diversification and depletion in the microfossil record, and the onset of the Sturtian glaciation. A volcanic tuff interbedded with… CONTINUE READING
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