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Map Satellite An unusual variety of minerals has been found in the Franciscan galucophane schists here. Three, deerite, howieite and zussmanite, were discovered in the mid-1960's. Approximately 20 other minerals occur in this quarry.
Rocks exposed in the quarry include both metamorphosed sedimentary and volcanic rock of the Franciscan formation. There are a number of faults in the region and two are easily observable in the quarry.
Integrity: A quarry worked by the California Division of Highways.
Use: General
Ref: Chesterman, Charles W., 1966. Guide to Mineralogy of the Laytonville Quarry, Mendocino County, California, in Bailey, Edgar, ed. Geology of Northern California. San Francisco. California Division of Wines and Geology, Bull. 190, p. 503-507.
May 1975
Inventory of California Natural Areas
Revision © 2009 Steven Louis Hartman
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