Forbes Shale


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.

Fossil content

The following fossils were reported from the formation:
;BivalvesCladoceramus undulatoplicatusGlycymerita veatchiiInoceramus subundatusI. Inoceramus vancouverensisI. aff. chicoensisI. aff. klamathensisI. aff. whitneyiParallelodon|Parallelodon brewerlanusPseudomelania colusaensis
;GastropodsBernaya (Protocypraea) kayeiBiplica obliquaDentalium (Entalis) whiteavesiPseudomelania colusaensisTessarolax distortaVolutoderma californica
;AmmonitesBaculites chicoensisB. inornatusDesmophyllites diphylloidesEupachydiscus arbucklensisE. willgreeniEutrephoceras campbelliLytoceras (Gaudryceras) alamedenseNowakites dobbinsiN. rumseyensisOxybeloceras petrolenseParapachydiscus cortinaensisPuzosia (Holcodiscoides) gorrilliPuzosia (Parapuzosia) arenaicaBaculites sp.Canadoceras sp.