前寒武纪
叠层石
多样性（政治）
古生物学
藻类
绿藻
生物
生态学
地质学
化学
人类学
社会学
有机化学
碳酸盐
出处
期刊：Science
[American Association for the Advancement of Science (AAAS)]
日期：1971-11-19
卷期号：174 (4011): 825-827
被引量：258
标识
DOI：10.1126/science.174.4011.825
摘要
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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