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Hi, @molly-shaw – did you need some help with identifying your fossil? @bill-heim may be able to help.

Here is some information on the geology of the area, specifically on the Purisima formation: https://macrostrat.org/sift/#/strat_name_concept/14197

You can use this map to zoom into your collection site and better determine the geologic context: https://macrostrat.org/map/#/z=5.7/x=-119.3566/y=37.3839/bedrock/lines/