title: Life on land in the precambrian.
abstract: 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 approximately 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.
authors.forename: R J
authors.initials: RJ
authors.lastname: Horodyski
authors.forename: L P
authors.initials: LP
authors.lastname: Knauth