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Carboniferous - Calaveras formation (2) |
Cretaceous - Mariposa slates (2) |
Geology -- United States --Maps (2) |
Geology--California--Amador County--Maps (1) |
Geology--California--El Dorado County--Maps (1) |
Geology--California--Maps (1) |
Neogene - Ione formation; Chico formation (1) |
Neogene - unnamed strata (1) |