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. 2014 Mar 13;9(3):e91419. doi: 10.1371/journal.pone.0091419

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© 2014 Boessenecker et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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(A) Generalized geologic map of Purisima Formation exposures in Northern California, modified from Boessenecker (2011). (B) Geographic location of (A) in California, and (C) map of North America showing location of (B). (D) Map of Santa Cruz county coastline showing location of cliff exposures and sections 1, 2, and 3 examined during this study. Abbreviations: ss, sandstone; sls, siltstone; ms, mudstone.