Strata mapped as “?Matilija Formation” (late Eocene) by Dibblee (1950) are Late Cretaceous in age and in actuality represent the Jalama Formation. Calcareous nannoplankton and benthonic foraminifers indicate a late Campanian–early Maastrichtian age, equivalent to the Tetralithus trifidus zone (nannoplankton). A “Franciscan” terrain provenance for these sediments is indicated by the presence of grains of red and black chert and serpentinite.

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