Calibrating Rates of Early Cambrian Evolution

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Calibrating Rates of Early Cambrian Evolution

Show simple item record Bowring, Samuel A. Kolosov, Peter Grotzinger, John P. Isachsen, Clark E. Pelechaty, Shane M. Knoll, Andrew 2009-07-15T13:26:41Z 1993
dc.identifier.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. en
dc.identifier.issn 0193-4511 en
dc.description.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. en
dc.description.sponsorship Organismic and Evolutionary Biology en
dc.language.iso en_US en
dc.publisher American Association for the Advancement of Science en
dc.relation.isversionof en
dash.license META_ONLY
dc.title Calibrating Rates of Early Cambrian Evolution en
dc.relation.journal Science en Knoll, Andrew
dash.embargo.until 10000-01-01

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