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Lake Elsinore, Pinacate District, Riverside Co., California, USA

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Location is approximate, estimate based on other nearby localities.
Latitude & Longitude (WGS84): 33° 40' 5'' North , 117° 19' 38'' West (est.)
Margin of Error:~0km

A populated place (incorporated city) located on the eastern shore of Lake Elsinore (lake).

Mineral List

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

12 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 Pleistocene - Holocene
0.0117 Ma
Young alluvial-fan deposits, Unit 1

Age: Anthropocene (0.0117 Ma)

Description: Slightly to moderately consolidated silt, sand, and coarse-grained sand to bouldery alluvial-fan deposits having moderately dissected surfaces. Has well- developed S5 soils on south side of San Gabriel and San Bernardino mountains. Appears to form major fill that was deposited throughout San Bernardino Valley region during transition between late Pleistocene and Holocene (McFadden and Weldon, 1987; Morton and Matti, 1987). Also, widespread on north side of San Bernardino Mountains, but mainly forming relatively small fans. On south side of mountains, especially San Gabriel Mountains, fans contain much higher percentage of boulders than on north side of San Bernardino Mountains, east of Mojave River. There fans are made up largely of sand- to pebble-size clasts, and most show very indistinct stratification

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]

Late Jurassic - Paleozoic
145 - 541 Ma
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]

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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