Anderson Ranch deposit, Letterbox Hill, Lassen Co., California, USA
Latitude & Longitude (WGS84): | 41° 1' 41'' North , 120° 53' 3'' West |
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Latitude & Longitude (decimal): | 41.02833,-120.88417 |
Köppen climate type: | Csb : Warm-summer Mediterranean climate |
A pumice occurrence located in the center sec. 24, T37N, R9E, MDM, 1.0 km (3,400 feet) N of Letterbox Hill, along Preston Canyon, on National Forest land. Operated by H. P. Anderson. MRDS database stated accuracy for this location is 1,000 meters. This deposit has not been worked.
Local rocks include Tertiary pyroclastic and volcanic mudflow deposits, unit 9 (Cascade Range).
Workings include surface openings comprised of several shallow pits and cuts.
A sizing test gave 90.4% minus 100 mesh and 9.6% plus 100 mesh. Material was reported to contain less than 1% Fe.
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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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Gelasian - Chattian 1.806 - 28.1 Ma ID: 2960334 | Tertiary pyroclastic and volcanic mudflow deposits, unit 9 (Cascade Range) Age: Cenozoic (1.806 - 28.1 Ma) Stratigraphic Name: Alturas Formation; Bonta Formation; Cedarville Series (part); Delleker Formation; Ingalls Formation; Mehrten Formation (part); Nomlaki Tuff Member; Penman Formation; Reeds Creek Andesite; Spanish Canyon Formation; Tropico Group (part); Tuscan Formation; Valley Springs Formation (part) Description: Tertiary pyroclastic and volcanic mudflow deposits. Lithology: Major:{andesite}, Minor:{rhyolite}, Incidental:{basalt, basaltic andesite} 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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