Biological and Molecular Geochemical Evidence for Dinoflagellate Ancestors in the Upper Sinian-Cambrian |
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| Authors: | ZHANG Shuichang Key Laboratory of Petroleum Geochemistry China National Petroleum Corporation Beijing J. Mike MOLDOWAN |
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| Affiliation: | ZHANG Shuichang,Key Laboratory of Petroleum Geochemistry,China National Petroleum Corporation,Beijing J. Mike MOLDOWAN Department of Geological and Environmental Sciences,Stanford University,CA,USABIAN Lizeng,Department of Earth Sciences,Nanjing University,Nanjing ZHANG Baomin and ZHANG LipingDepartment of Petroleum Geology,Research Institute of Petroleum Exploration and Development,CNPC,Beijing |
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| Abstract: | Dinoflagellates are single celled organisms that reflect the ecological conditions in modern oceans and lakes. Their earliest undisputed fossil record suggests that dinoflagellates originated from the Middle Triassic (c. 240 Ma ago). However, the presence of molecular biomarkers (dinosterane, 4α‐methyl‐24‐ethylcholestane and triaromatic dinosteroids) in rock extracts and coccoid dinoflagellate fossils from the upper Sinian to Cambrian of the Tarim basin confirms the hypothesis that dinoflagellates have an ancient origin, and predate the oldest undisputed dinoflagellate fossils at least by 300 Ma, as early as the late Sinian‐Cambrian. |
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| Keywords: | dinoflagellates dinosterane triaromatic dinosteroids Cambrian |
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