Calibrating rates of early Cambrian evolution.

@article{Bowring1993CalibratingRO,
  title={Calibrating rates of early Cambrian evolution.},
  author={Samuel A. Bowring and John P. Grotzinger and Clark E. Isachsen and Andrew H Knoll and S. M. Pelechaty and P N Kolosov},
  journal={Science},
  year={1993},
  volume={261},
  pages={1293-8}
}
An explosive episode of biological diversification occurred near the beginning of the Cambrian period. Evolutionary rates in the Cambrian have been difficult to quantify accurately because of a lack of high-precision ages. Currently, uranium-lead zircon geochronology is the most powerful method for dating rocks of Cambrian age. Uranium-lead zircon data from lower Cambrian rocks located in northeast Siberia indicate that the Cambrian period began at approximately 544 million years ago and that… CONTINUE READING
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