The Forbes Shale is a geologic formation in the Sacramento Valley of northern California, United States. It is found in the Sutter Buttes area of Sutter County, California. It preserves fossils dating back to the Coniacian stage of the Late Cretaceous period.Forbes Shale at Fossilworks.org
Fossil content The following fossils were reported from the formation:Anderson, 1958 Bivalves
Cladoceramus undulatoplicatus Glycymerita veatchii Inoceramus subundatus I. Inoceramus vancouverensis I. aff. chicoensis I. aff. klamathensis I. aff. whitneyi Parallelodon|Parallelodon (Nanonavis) brewerlanus Pseudomelania colusaensis
Gastropods
Bernaya (Protocypraea) kayei Biplica obliqua Dentalium (Entalis) whiteavesi Pseudomelania colusaensis Tessarolax distorta Volutoderma californica
Ammonites
Baculites chicoensis B. inornatus Desmophyllites diphylloides Eupachydiscus arbucklensis E. willgreeni Eutrephoceras campbelli Lytoceras (Gaudryceras) alamedense Nowakites dobbinsi N. rumseyensis Oxybeloceras petrolense Parapachydiscus cortinaensis Puzosia (Holcodiscoides) gorrilli Puzosia (Parapuzosia) arenaica Baculites sp. Canadoceras sp. Hauericeras sp.
See also
List of fossiliferous stratigraphic units in California
References
Bibliography
Further reading Google Books: The Sutter Buttes of California: A Study of Plio-Pleistocene Volcanism; Howel Williams, Garniss H. Curtis.