Letha Lee Prospect, Gem Park complex, Fremont Co., Colorado, USA
|Latitude & Longitude (WGS84):||38° 16' 10'' North , 105° 33' 52'' West|
|Latitude & Longitude (decimal):||38.26944,-105.56444|
|Köppen climate type:||BSk : Cold semi-arid (steppe) climate|
REF:Deposit:: PARKER, R. L. AND SHARP, W. N., 1970, MAFIC-ULTRAMAFIC IGNEOUS ROCKS AND ASSOCIATED CARBONATITES OF THE GEM PARK COMPLEX, CUSTER AND FREMONT COUNTIES, COLORADO: USGS PROF. PAPER 649, 24 P.
Deposit:: TAYLOR, R. B., SCOTT, G. R., WOBUS, R. A. AN
Commodities (Major) - REE, Niobium (Columbium)
Development Status: Occurrence
Structure: Central Cordillera (Southern Rocky Mountains), Gem Park Complex
Host Rock: Pyroxenite
Tectonic Structure: Wet Mountains
Commodity ListThis is a list of exploitable or exploited mineral commodities recorded at this locality.
5 valid minerals.
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
23.03 - 33.9 Ma
|Ash-flow tuff of main volcanic sequence|
Age: Oligocene (23.03 - 33.9 Ma)
Description: Includes many named units
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. 
1600 - 2500 Ma
|Paleoproterozoic crystalline metamorphic rocks|
Age: Proterozoic (1600 - 2500 Ma)
Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529.