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Cascade Canyon, San Gabriel Mts, San Bernardino Co., California, USA

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Latitude & Longitude (WGS84): 34° 12' 46'' North , 117° 39' 47'' West
Latitude & Longitude (decimal): 34.21278,-117.66306
Köppen climate type:Csb : Warm-summer Mediterranean climate

An E-W-trending branch of San Antonio Canyon located in the NE¼SE¼ sec. 36, T2N, R8W, SBM.

Approximate elevation of mineralized area is between 4500 and 5000 feet. Geologically, the area consists of metamorphic rock intruded by some granitic masses. Principal stratified layers have an east-west strike and a north dip of about 60 degrees. Beds from north to south consist of quartzite, limestone followed by quartzite, limestone and gneiss. This series is correlated with some Paleozoic limestone in the San Bernardino mountains. Mineralization of the area is probably in part due to the intrusion of the igneous mass.

At least 20 minerals can be collected in the Cascade canyon area, among them lazurite, diopside, corundum, "hydrotroilite" and phlogopite. Lapis lazuli occurs in the limestone in small bands from 1/8 inch to six inches wide, sometimes containing pyrite crystals. Corundum has not been found in the canyon proper, but good specimens have been obtained in San Antonio wash. Crystals are from 1/4 inch to one inch in length and are of a pinkish color.

A large variety of metamorphic rocks occur here

Warning: very steep topography subject to landslides. NOTE: This canyon crosses the county lines into Los Angeles County.

Mineral List

13 valid minerals.

Rock Types Recorded

Note: this is a very new system on mindat.org and data is currently VERY limited. Please bear with us while we work towards adding this information!

Select Rock List Type

Alphabetical List Tree Diagram

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

Middle Pleistocene - Early Pleistocene
0.126 - 2.588 Ma

ID: 2251049
Very old landslide deposits

Age: Pleistocene (0.126 - 2.588 Ma)

Description: Slope-failure deposits that consist of displaced bedrock blocks and (or) chaotically mixed rubble. Geomorphic form of landslides poorly, or not at all, preserved. Inferred to have accumulated late in main uplift history of Transverse Ranges. In San Bernardino Mountains includes large multiple slides in canyon of City Creek and numerous scattered slides along mountain front within one or 2 km of San Andreas Fault. In San Gabriel Mountains, includes two large, multiple slide masses at Crystal Lake and Alpine Canyon in upper reaches of North Fork of San Gabriel River. Deposits in both slide areas are highly dissected

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]

Cretaceous - Paleoproterozoic
66 - 2500 Ma

ID: 2933602
pre-Cenozoic metasedimentary and metavolcanic rocks undivided

Age: to Cretaceous (66 - 2500 Ma)

Stratigraphic Name: Kings Sequence; McCoy Mountains Formation (part); Palm Canyon Complex; Placerita Formation

Description: Undivided pre-Cenozoic metasedimentary and metavolcanic rocks of great variety. Mostly slate, quartzite, hornfels, chert, phyllite, mylonite, schist, gneiss, and minor marble.

Lithology: Major:{schist,gneiss}, Minor:{quartzite,argillite}, Incidental:{phyllite, metavolcanic, slate, hornfels, marble, chert, sandstone, mudstone, 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.


Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Louderback, George Davis & Walter C. Blasdale (1910), Ruby corundum from San Bernardino County, California (abstract): Science, new series: 32: 31; […Geological Society of America Bulletin: 21: 793 (1910)].
Merriam, R. and Laudermilk, J. D. (1936) Two Diopsides from Southern California. The American Mineralogist: 21(11): 715-718.
Eaton, A.L. (1946), Pomona club collects at mineralized Cascade Canyon. The Desert Magazine, Volume 9 Number 10, August. Desert Press, Inc. El Centro, California, 40pp.: 9(10): 31.
Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 161.
Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 143, 426.
Shepherd, H. V. (2010). Zr-in-rutile Thermometry of a Ruby-bearing Metamorphic Rock, Cascade Canyon, San Bernardino County, California. In Geological Society of America Abstracts with Programs: 42(1)(March): 160.

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