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Precambrian columnar stromatolite diversity: reflection of metazoan appearance |
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| Authors: | Awramik S M |
| Abstract: | Columnar stromatolites (organosedimentary structures built by bluegreen algae) show a marked decrease in diversity in the Late Precambrian; this decrease in diversity occurs at approximately the same time as the appearance of metazoans, 600 to 700 million years ago. |
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