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Santa Ana Mts, Riverside Co., California, USA

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Latitude & Longitude (WGS84): 33° 45' 0'' North , 117° 32' 33'' West
Latitude & Longitude (decimal): 33.75002,-117.54255
Köppen climate type:Csa : Hot-summer Mediterranean climate

A mountain range. A short peninsular range extending for approximately 61 miles (98 km) SE of the Los Angeles Basin, mostly along the border between Orange and Riverside Counties.

Note: The geographic coordinates presented are taken from the Alberhill topo map (GNIS database preferred). The USGS GNIS database presents 5 sets of coordinates for this range.

Commodity List

This is a list of exploitable or exploited mineral commodities recorded from this region.

Mineral List

Mineral list contains entries from the region specified including sub-localities

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

Rock Types Recorded

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Rock list contains entries from the region specified including sub-localities

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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

Late Jurassic - Paleozoic
145 - 541 Ma

ID: 2717865
Jurassic marine rocks, unit 4 (Peninsular Ranges and Western Transverse Ranges)

Age: Phanerozoic (145 - 541 Ma)

Stratigraphic Name: Bedford Canyon Formation; Santa Monica Slate; French Valley Formation

Description: Shale, sandstone, minor conglomerate, chert, slate, limestone; minor pyroclastic rocks

Comments: Southwestern California, Peninsular Ranges. Primarily fine-grained pelitic rocks and graywacke, variably metamorphosed. May include some rocks of Paleozoic age

Lithology: Major:{argillite}, Minor:{graywacke,quartzite,phyllite,schist}, Incidental:{chert, conglomerate, gneiss, amphibolite, marble, limestone, ultramafic}

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]

145 - 201.3 Ma

ID: 2246764
Bedford Canyon Formation, undifferentiated

Age: Jurassic (145 - 201.3 Ma)

Description: Slightly metamorphosed assemblage of interlayered argillite, slate, phyllite, graywacke, impure quartzite, and small masses of limestone. As used here, Bedford Canyon Formation is areally limited to northern part of Santa Ana Mountains. Most of unit is poorly exposed, best exposures restricted to road cuts. Bedding and primary sedimentary structures are commonly preserved, although tightly folded bedding is common. Fissile, black argillite and slate are very fine-grained and consist of beds 2 to 8 cm in thickness. Massive bedded, impure, fine- to medium-grained, pale-gray to pale-brown quartzite and graywacke beds are 4 to 30 cm thick. Locally carbonaceous. Lenses of conglomerate occur sparsely through sequence. Incipiently developed transposed layering, S1, is locally well-developed.

Reference: Morton, D.M., F.K. Miller . Geologic Map of the San Bernardino and Santa Ana 30' x 60' quadrangles, California. U.S. Geological Survey Open-File Report 2006-1217. [42]

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

Localities in this Region


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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