Coolidge Springs deposit, Desert Shores, Imperial Co., California, USA
|Latitude & Longitude (WGS84):||33° 24' 25'' North , 116° 3' 45'' West|
|Latitude & Longitude (decimal):||33.40722,-116.06250|
|Other regions containing this locality:||Sonoran Desert, North America|
|Köppen climate type:||BSh : Hot semi-arid (steppe) climate|
A limestone deposit located in sec. 7, T9S, R9E, SBM, 2.1 km (1.3 miles) W of Desert Shores and 1.9 km (6,200 feet) NW of Coolidge Springs, on Bureau of Land Management administered land (wilderness land ?). MRDS database stated accuracy for this location is 500 meters. Also located in sections 5, 6, 8 & 17.
A sedimentary deposit hosted in metasedimentary rock, schist. The ore body is bedded, tabular at a thickness of 30.48 meters and a length of 1,219.2 meters. Associated rocks include gneiss. Local rocks include pre-Cenozoic metasedimentary and metavolcanic rocks undivided and/or limestone of probable Paleozoic or Mesozoic age.
Analytical data results: Analysis by Oesterling and Spurk gave: 84-95.5% CaCO3; 1.39-4.7% MgCO3; 0.23-5.81% SiO2; 0.01-0.61% Fe2O3; 0.22-5.67% Al2O3.
1 valid mineral.
Rock Types Recorded
Select Rock List TypeAlphabetical List Tree Diagram
Entries shown in red are rocks recorded for this region.
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
|Mesozoic - Paleozoic|
66 - 541 Ma
|Limestone of probable Paleozoic or Mesozoic age|
Age: Phanerozoic (66 - 541 Ma)
Stratigraphic Name: Calaveras Complex (part); Gabilan Limestone; Hite Cove Formation (part); Riggs Formation; Sur Series (part)
Comments: Deformed and/or metamorphosed carbonate rocks mapped locally throughout State. Includes blocks in melange
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. 
Todd, V.R., Kilburn, J.E., Detra, D.E., Griscom, Andrew, Kruse, F.A., and McHugh, E.L. (1987), Mineral Resources of the Jacumba (In-Ko-Pah) Wilderness Study Area, Imperial County, California: USGS Bulletin 1711-D, 18 pp.
USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10062377 & 10139041.
U.S. Bureau of Mines Minerals Availability System/Mineral Industry Location System (MAS/MILS): file #0060250403.