Calibrating Rates of Early Cambrian Evolution

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Calibrating Rates of Early Cambrian Evolution

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Title: Calibrating Rates of Early Cambrian Evolution
Author: Bowring, Samuel A.; Kolosov, Peter; Grotzinger, John P.; Isachsen, Clark E.; Pelechaty, Shane M.; Knoll, Andrew

Note: Order does not necessarily reflect citation order of authors.

Citation: Bowring, Samuel A., John P. Grotzinger, Clark E. Isachsen, Andrew H. Knoll, Shane M. Pelechaty, and Peter Kolosov. 1993. Calibrating rates of early Cambrian evolution. Science 261(5126): 1293-1298.
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Abstract: 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 its oldest (Manykaian) stage lasted no less than 10 million years. Other data indicate that the Tommotian and Atdabanian stages together lasted only 5 to 10 million years. The resulting compression of Early Cambrian time accentuates the rapidity of both the faunal diversification and subsequent Cambrian turnover.
Published Version: http://dx.doi.org/10.1126/science.11539488
Citable link to this page: http://nrs.harvard.edu/urn-3:HUL.InstRepos:3190366

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  • FAS Scholarly Articles [7495]
    Peer reviewed scholarly articles from the Faculty of Arts and Sciences of Harvard University
 
 

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