Cascade Canyon, San Gabriel Mts, San Bernardino Co., California, USA
|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.
13 valid minerals.
Rock Types Recorded
Select Rock List TypeAlphabetical List Tree Diagram
Entries shown in red are rocks recorded for this region.
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
|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. 
|Cretaceous - Paleoproterozoic|
66 - 2500 Ma
|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
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.