Fort Barry, Marin Co., California, USA
Latitude & Longitude (WGS84): | 37° 49' 45'' North , 122° 30' 44'' West |
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Latitude & Longitude (decimal): | 37.82917,-122.51250 |
Köppen climate type: | Csb : Warm-summer Mediterranean climate |
An historical military reservation. Now part of the Golden Gate National Recreation Area.
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-localities2 valid minerals.
Rock Types Recorded
Rock list contains entries from the region specified including sub-localities
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Alphabetical List Tree DiagramRegional 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.
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Cretaceous - Jurassic 66 - 201.3 Ma ID: 2711450 | Franciscan Complex Age: Mesozoic (66 - 201.3 Ma) Stratigraphic Name: Franciscan Complex Description: Chert: Chert with shale interbeds. Chert is thin bedded, closely fractured, and parts along bedding planes; contains tests of radiolaria that range in age from early Jurassic (Tithonian) to Middle Cretaceous (Cenomanian) age (Murchey, 1984); crops out as irregularly shaped bodies as long as 4.5 km. In southern Marin County and parts of San Francisco, chert up to 100 m thick overlies pillow lava and is overlain conformably by a few feet of fine-grained, black shale that grades into overlying graywacke and shale. 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. [38] |
Cretaceous - Jurassic 66 - 201.3 Ma ID: 2745130 | Franciscan Complex, unit 1 (Coast Ranges) Age: Mesozoic (66 - 201.3 Ma) Stratigraphic Name: Franciscan Complex; Dothan Formation; Honda Formation; San Luis Formation; Valentine Spring Formation Description: Franciscan complex: Cretaceous and Jurassic sandstone with smaller amounts of shale, chert, limestone, and conglomerate. Includes Franciscan melange, except where separated--see KJfm. Comments: Coast Ranges. Primarily Yolla Bolly, Central, and San Simeon terranes of Silberling et al. (1987). Consists primarily of variably deformed and metamorphosed graywacke, mudstone, and chert. Lithology: Major:{sandstone,mudstone}, Minor:{chert}, Incidental:{limestone, conglomerate, greenstone, serpentinite, gabbro, amphibolite, schist, felsic volcanic} 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] |
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Localities in this Region
- California
- Marin Co.
- Fort Barry
- Marin Co.