Precambrian Columnar Stromatolite Diversity: Reflection of Metazoan Appearance

Science  19 Nov 1971:
Vol. 174, Issue 4011, pp. 825-827
DOI: 10.1126/science.174.4011.825


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.