Research Articles

Life on Land in the Precambrian

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Science  28 Jan 1994:
Vol. 263, Issue 5146, pp. 494-498
DOI: 10.1126/science.263.5146.494


Microfossils have been discovered in cavity-fill and replacement silica that occurs between chert-breccia clasts in 1200-million-year-old paleokarst at the top of the Mescal Limestone, central Arizona, and in ∼800-million-year-old paleokarst at the top of the Beck Spring Dolomite, southeastern California. Microbial communities on Precambrian (>550 million years ago) land may have been extensive enough to affect weathering, erosion, sedimentation, and geochemical processes.

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