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Oceanic Mine, Cambria, Cambria-Oceanic District, Santa Lucia Mts (Santa Lucia Range), San Luis Obispo Co., California, USA

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Latitude & Longitude (WGS84): 35° 34' 41'' North , 120° 59' 45'' West
Latitude & Longitude (decimal): 35.57806,-120.99583
Köppen climate type:Csb : Warm-summer Mediterranean climate

A former Hg mine located in secs. 15 & 21, T27S, R9E, MDM, about 7.7 km (4.8 miles) ENE of Cambria.

NOTE: Coordinates provided are approximate to the SE corner of sec. 15 (NW corner of sec. 21).

Mineral List

6 valid minerals. 1 (TL) - type locality of valid minerals.

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

66 - 145 Ma

ID: 3191825
Mesozoic sedimentary rocks

Age: Cretaceous (66 - 145 Ma)

Lithology: Sedimentary rocks

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Cretaceous - Jurassic
66 - 201.3 Ma

ID: 3026814
Franciscan Complex, unit 1 (Coast Ranges)

Age: Mesozoic (66 - 201.3 Ma)

Stratigraphic Name: Franciscan Complex; Dothan Formation; Honda Formation; San Luis Formation; Valentine Spring Formation

Description: Franciscan complex: Cretaceous and Jurassic sandstone with smaller amounts of shale, chert, limestone, and conglomerate. Includes Franciscan melange, except where separated--see KJfm.

Comments: Coast Ranges. Primarily Yolla Bolly, Central, and San Simeon terranes of Silberling et al. (1987). Consists primarily of variably deformed and metamorphosed graywacke, mudstone, and chert.

Lithology: Major:{sandstone,mudstone}, Minor:{chert}, Incidental:{limestone, conglomerate, greenstone, serpentinite, gabbro, amphibolite, schist, felsic volcanic}

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, used under Creative Commons Attribution 4.0 License

This page contains all mineral locality references listed on 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 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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Von Leicht, F. (1899), Cinnabar in San Luis Obispo County, California: Mining and Scientific Press: 78: 482.
Aubury, Lewis E. (1903), The quicksilver resources of California: California Mining Bureau Bulletin 27: 149.
Ransome, Alfred Leslie & J.L. Kellogg (1939), Quicksilver resources of California: California Division Mines Report 35: 441.
Eckel, Edwin Butt, R.G. Yates & A.E. Granger (1941), Quicksilver deposits in San Luis Obispo County and southwestern Monterey County, California: USGS Bulletin 922-R: 515, 580.
Davis, Fenelon Francis and E.H. Bailey (1966) Mercury. California Division Mines and Geol. Bulletin 191: 252.
Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 147, 149, 260.
Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 111 (map 3-7), 121, 303.
American Mineralogist (1979): 64(3-4): 1026-1038.

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