Indications of a biological and biochemical evolutionary trend during the archean and early proterozoic |
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| Authors: | Bartholomew Nagy Lois Anne Nagy John E Zumberge Deborah S Sklarew Phillip Anderson |
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| Institution: | Laboratory of Organic Geochemistry, Department of Geosciences, The University of Arizona, Tucson, Ariz. 85721 U.S.A. |
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| Abstract: | Micropaleontological observations and organic geochemical analyses imply, but certainly do not prove, that life may not have been present ～3,800 Ma ago in Southwestern Greenland; however, physiologically complex prokaryotes flourished by the Early Proterozoic in other locations. It is, of course, also possible that life may have appeared earlier in locations other than Greenland. Investigations of Precambrian biological and biochemical evolutionary trends require interdisciplinary efforts, up-to-date instrumentation and methodology (such as ultramicrochemical analyses of individual microfossils/microstructures), and caution in the interpretation of experimental results. |
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