Chileno Valley Stone deposit, Antonio Mountain, Marin Co., California, USA
|Latitude & Longitude (WGS84):||38° 12' 7'' North , 122° 43' 31'' West|
|Latitude & Longitude (decimal):||38.20222,-122.72528|
|Köppen climate type:||Csb : Warm-summer Mediterranean climate|
A crushed stone deposit/operation located in the NW¼SW¼ sec. 10, T4N, R8W, MDM, 1.3 km (0.8 mile) NE of Antonio Mountain (coordinates of record) and 8.5 km (5.3 miles) WSW of Petaluma (Sonoma County), in the Chileno Valley. MRDS database stated accuracy for this location is 1,000 meters.
Local rocks include Mesozoic volcanic rocks, unit 1 (Coast Ranges) and/or rocks of the Franciscan melange.
Commodity ListThis is a list of exploitable or exploited mineral commodities recorded at this locality.
No minerals currently recorded for this locality.
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
|Holocene - Late Pleistocene|
0 - 0.126 Ma
|Alluvial fan deposits|
0 - 2.588 Ma
Age: Pleistocene (0 - 2.588 Ma)
Reference: Blake, M.C. Jr., R.W. Graymer, and D.L. Jones. Geologic map and map database of parts of Marin, San Francisco, Alameda, Contra Costa, and Sonoma Counties, California. U.S. Geological Survey Miscellaneous Field Studies MF 2337. 
|Cretaceous - Jurassic|
66 - 201.3 Ma
Age: Mesozoic (66 - 201.3 Ma)
Stratigraphic Name: Franciscan Complex
Description: Melange of fragmented and sheared Franciscan complex rocks.
Comments: Coast Ranges. Includes areas of Franciscan rocks specifically distinguished as melange on the Geologic Map of California. Includes parts of central and eastern Franciscan belts of Blake et al. (1988)
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.