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Port Costa, Contra Costa Co., California, USA

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Latitude & Longitude (WGS84): 38° 2' 47'' North , 122° 10' 55'' West
Latitude & Longitude (decimal): 38.04639,-122.18222
KΓΆppen climate type:Csb : Warm-summer Mediterranean climate


A populated place (town) located on the S shore of the Carquinez Strait.


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-localities
 No mineral species recorded.

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 Macrostrat.org

Holocene
0 - 0.0117 Ma



ID: 2592212
Alluvial fan deposits

Age: Anthropocene (0 - 0.0117 Ma)

Description: Moderately to poorly sorted and moderately to poorly bedded sand, gravel, silt, and clay deposited where streams emanate from upland regions onto more gently sloping valley floors or plains. Holocene alluvial fan deposits are mostly undissected by later erosion. In places, Holocene deposits may only form a thin layer over Pleistocene and older deposits

Reference: Graymer, R.W., D.L. Jones, E.E. Brabb. Geologic Map and Map Database of Northeastern San Francisco Bay Region, California. U.S. Geological Survey Miscellaneous Field Studies Map MF-2403. [92]

Ma



ID: 2540968

Age: Anthropocene ( Ma)

Reference: Graymer, R.W., D.L. Jones, E.E. Brabb. Preliminary geologic map emphasizing bedrock formations in Contra Costa County, California. U.S. Geological Survey Open-File Report 94-622. [86]

Maastrichtian - Cenomanian
66 - 100.5 Ma



ID: 3022650
Upper Cretaceous marine rocks, unit 1 (Upper Great Valley Sequence)

Age: Late Cretaceous (66 - 100.5 Ma)

Stratigraphic Name: Adobe Flat Shale Member; Asuncion Group; Atascadero Formation; Bald Hills Formation; Chico Formation; Forbes Formation; Funks Formation; Gualala Group; Guinda Formation; Jack Creek Formation; Jalama Formation; Kione Sand; Ladd Formation; Moreno Formation; Panoche Formation; Pigeon Point Formation; Rosario Formation; Salt Creek Conglomerate; Sites Formation; Venado Formation; Williams Formation; Yolo Formation; Great Valley Sequence; Boxer Formation; Cortina Formation; Rumsey Formation; Budden Canyon Formation; Tuna Canyon Formation; Rosario Group; Lusardi Formation; Point Loma Formation; Cabrillo Formation

Description: Upper Cretaceous sandstone, shale, and conglomerate

Comments: Coast Ranges, western Transverse Ranges, Peninsular Range. Upper part of Great Valley Sequence. Thick, extensive sequences of shale, siltstone, sandstone, and conglomerate primarily of deep-marine (turbidite) facies

Lithology: Major:{sandstone,siltstone mudstone}, Incidental:{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]

Late Cretaceous
66 - 100.5 Ma



ID: 3031808
Great Valley Sequence

Age: Late Cretaceous (66 - 100.5 Ma)

Stratigraphic Name: Great Valley Sequence

Description: Sandstone, siltstone, shale and minor conglomerate;

Reference: Wagner, D.L., and C.I. Gutierrez. Geologic map of the Napa 30' x 60' quadrangle, California. California Geological Survey. [138]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License


Localities in this Region


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.
 
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