The Monterey Formation is an extensive Miocene oil-rich geological sedimentary formation in California, with outcrops of the formation in parts of the California Coast Ranges, Peninsular Ranges, and o
Outcrop of Monterey Formation, Gaviota State Park, California
Upper Miocene Migeulito member exposed at Hazard Reef, Montana de Oro State Park. This is the first onshore outcrop of the Monterey Formation south of the Monterey Peninsula. Large exposures continue south along the coast, often associated with important oilfields.
Tar "volcano" in the old Carpinteria Asphalt mine. Heavy oil exudes from joint cracks in the upturned Monterey shale forming the floor of mine. 1906 photo, U.S. Geological Survey Bulletin 321
Fold in Monterey Formation
The Sisquoc Formation is a sedimentary geologic unit widespread in Southern California, both on the coast and in mountains near the coast. Overlying the Monterey Formation, it is of upper Miocene and
Monterey Formation
…Company/Johns Mansfield quarry in Lompoc. However, the age and even formation of these deposits is disputed, as some sources attribute them to the overlying Sisquoc Formation instead. Based on the Paleobiology Database…
Sisquoc Formation at the stairs to More Mesa Beach, Santa Barbara, California
Close-up photograph of the Sisquoc Formation, showing the friable, planiform nature of the rock on a weathered surface. Rock hammer for scale.
Diatomite quarries near Lompoc, California (2009), are a major source of diatomaceous earth.