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Unnamed Asbestos prospects [1] (Prospects East of Russellman), North Peak, Mount Diablo (Mt Diablo), Clayton, Diablo Range, Contra Costa Co., California, USA

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Latitude & Longitude (WGS84): 37° 55' 2'' North , 121° 54' 21'' West
Latitude & Longitude (decimal): 37.91750,-121.90611
Köppen climate type:Csb : Warm-summer Mediterranean climate

An asbestos occurrence/prospects located in the SW¼SE¼ sec. 19, T1N, R1E, MDM, 2.8 km (1.7 miles) NNW of North Peak (coordinates of record) and 3.6 km (2.3 miles) SE of Clayton, at the northern foot of the peak. MRDS database states locality is in Russellmann Park; however, the coordinates provided map to a point N of the park.

Some asbestos has been found in the serpentine. Local rocks include Lower Cretaceous marine rocks.

Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.

Mineral List

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

Early Cretaceous
100.5 - 145 Ma

ID: 2541681
Great Valley Sequence Unit A - Shale, with minor sandstone

Age: Early Cretaceous (100.5 - 145 Ma)

Description: Olive-brown to dark gray siltstone and mudstone. Spherical concretions common. Locally includes (mapped in part) sandstone member (Kas).

Comments: Great Valley Sequence

Reference: Graymer, R.W., D.L. Jones, E.E. Brabb. Preliminary geologic map emphasizing bedrock formations in Contra Costa County, California. U.S. Geological Survey Open-File Report 94-622. [86]

Aptian - Berriasian
113 - 145 Ma

ID: 2945604
Lower Cretaceous marine rocks

Age: Early Cretaceous (113 - 145 Ma)

Stratigraphic Name: Espada Formation; Horsetown Formation; Marmolejo Formation; Ono Formation; Paskenta Formation; Rector Formation; Shasta Series; Toro Formation; Wisenor Formation; Great Valley Sequence; Stony Creek Formation; Lodoga Formation; Budden Canyon Formation

Description: Lower Cretaceous sandstone, shale, and conglomerate

Comments: Coast Ranges. Middle part of Great Valley Sequence. Thick, extensive sequences of shale, siltstone, sandstone, and conglomerate. Included in undivided Lower Cretaceous and Upper Jurassic rocks on many recent maps

Lithology: Major:{siltstone mudstone}, Minor:{sandstone}, Incidental:{conglomerate}

Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052. [133]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License

This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.


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Davis, Fenelon Francis and H.B. Goldman (1958) Mines and mineral resources of Contra Costa County. California Journal of Mines and Geology: 54(4): 507, Pl. 5.
Wiebelt, F.J. and Smith M.C. (1959) A reconnaissance of asbestos deposits of the serpentine belt of northern California. U.S. Bureau of Mines Report of Investigation 7860, 52 pp.: 15.
Pampeyan, Earl Haig (1963) Geology and mineral deposits of Mount Diablo, Contra Costa County, California: California Division Mines & Geology, Special Report 80, 31 pp.: 21, Pl. 1.
USGS (2005) Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10029548.

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