Detailed information for reference 33498Powell, C.L., J.R. Allen, and P.J. Holland (2004) Invertebrate paleontology of the Wilson Grove Formation (late Miocene to late Pliocene), Sonoma and Marin counties, California, with some observations on its stratigraphy, thickness, and structure. USGS Open-file Report 2004-1017, 1-2.
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