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Sharon Park Drive outcrop, Sharon Heights, Menlo Park, San Mateo Co., California, USA

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Latitude & Longitude (WGS84): 37° 25' 26'' North , 122° 12' 24'' West
Latitude & Longitude (decimal): 37.42389,-122.20667
Köppen climate type:Csb : Warm-summer Mediterranean climate

Outcrop of a buddingtonite-bearing NE-striking rhyolite dyke, located S of Sharon Park Drive and N of Sunset Lane.

The outcrop area is about 58 meters long.

Mineral List

16 valid minerals.

Rock Types Recorded

Note: this is a very new system on 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

Oligocene - Paleocene
23.03 - 66 Ma

ID: 2914447
Eocene marine rocks

Age: Paleogene (23.03 - 66 Ma)

Stratigraphic Name: Anita Shale; Avenal Sandstone; Butano Sandstone; Canoas Siltstone; Capay Formation; Coldwater Sandstone; Cozy Dell Shale; Delmar Formation; Domengine Formation; Gredel Formation; Indart Sandstone; Jameson Shale Member of Markley Formation; Juncal Formation; Junipero Sandstone; Kreyenhagen Shale; Llajas Formation; Los Muertos Creek Formation; Lucia Shale; Mabury Formation; Maniobra Formation; Markley Formation; Matilija Sandstone; Meganos Formation; Nortonville Shale; Point of Rocks Sandstone; Rose Canyon Shale; Sacate Formation; Santa Susana Formation; Santiago Formation; Sierra Blanca Limestone; Tejon Formation; Tesla Formation; The Rocks Sandstone; Tolman Formation; Torrey Sandstone; Tres Pinos Sandstone; Welcome Formation; Yokut Sandstone; Reliz Canyon Formation; Mount Soledad Formation; Ardath Shale; Scripps Formation; Friars Formation; La Jolla Group; German Rancho Formation

Description: Shale, sandstone, conglomerate, and minor limestone; in part Oligocene and Paleocene.

Lithology: Major:{mudstone,sandstone}, Minor:{conglomerate}, Incidental:{limestone, siltstone, sedimentary breccia}

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]

Middle Eocene - Early Eocene
38 - 56 Ma

ID: 2580924
Whiskey Hill Formation

Age: Eocene (38 - 56 Ma)

Description: Light-gray to buff coarse-grained arkosic sandstone, with light-gray to buff silty claystone, glauconitic sandstone, and tuffaceous siltstone. Sandstone beds constitute about 30 percent of map unit. Tuffaceous and silty claystone beds are expansive. Locally, sandstone beds are well cemented with calcite. At apparent base of section on north side of Jasper Ridge, just east of Searsville Lake, a thin greenstone-pebble conglomerate is present. In places within this map unit, sandstone and claystone beds are chaotically disturbed. This formation is as much as 900 m thick

Reference: Brabb, E.E., R.W. Graymer, D.L. Jones. Geology of the onshore part of San Mateo County, California. U.S. Geological Survey Open-File Report 98-137. [90]

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

This page contains all mineral locality references listed on 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 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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Pampeyan, Earl Haig (2010) Buddingtonite in Menlo Park, California. USGS Open-File Report 10-1053.

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