Life on Land in the Precambrian

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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 approximate 800-million-year-old paleokarst at the top of the Beck Spring Dolomite, southeastern California. Microbial communities on Precambrian (more than 550 million years ago) land may have been extensive enough to affect weathering, erosion, sedimentation, and geochemical processes.

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