Davies et al. (2010, abstract) propose that, contrary to past studies, “The evidence suggests that the Juniata Formation at Potters Mills was deposited in a marginal marine setting and, as such, no evidence for early life on land can be inferred from its strata.” The new evidence they present, not only from the Juniata Formation at Potters Mills, but from other localities in Pennsylvania, is a facies analysis and description of sedimentary structures. This is a welcome approach to the problem, because there are distinctive marine sedimentary structures and facies such as turbidites, hummocky cross-bedding, and flaser and lenticular...

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