For the more information about the air resources of the National Park Service, please visit http://www.nature.nps.gov/air/.
Mt. Diablo State Park
Mt. Diablo State Park contains the best examples of diapiric (igneous intrusion) geologic processes in the South Pacific Border biophysiographic province. It is one of the few places in the region where geologic strata of Jurassic, Cretaceous, and Tertiary age can be seen in an aggregate thickness of 42,000 feet. The site also possesses a great diversity of native plant species and associations.
Location: Contra Costa County, CA
Year designated: 1982
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Please remember, National Natural Landmarks (NNLs) are not national parks. NNL status does not indicate public ownership, and many sites are not open for visitation.
Last Updated: June 28, 2012