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Boars Tusk, Leucite Hills District, Sweetwater Co., Wyoming, USA

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Latitude & Longitude (WGS84): 41° 57' 46'' North , 109° 11' 54'' West
Latitude & Longitude (decimal): 41.9627777778, -109.198333333


2.56 Ma old neck of diopside-leucite-phlogopite lamproite (wyomingite).
Located North of Rock Springs.

Commodities (Major) - Potassium
Development Status: Prospect
WYO. GEOL. SURVEY BULL 50,1966

Mineral List


3 valid minerals.

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 - Pleistocene
0 - 2.588 Ma
Dune sand and loess

Age: Pleistocene (0 - 2.588 Ma)

Description: Includes active and dormant sand dunes. In northwestern Wyoming is chiefly loess (age 12,000-19,000 years).

Lithology: Major:{unconsolidated sand}

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]

Quaternary - Tertiary
0 - 66 Ma
Lamproite talus and autobreccias

Age: Cenozoic (0 - 66 Ma)

Description: Consist of poorly consolidated materials (talus) eroded from various types of lamproites and consolidated autobreccias formed at the base of lamproite lavas during emplacement; usually forms an apron of talus surrounding the lamproite buttes and mesas and (where exposed) autobreccia rubble zones at the contact of the lamproite flows with underlying sedimentary rocks

Comments: Quaternary and Tertiary alkalic volcanic rocks (lamproites) occur in the Leucite Hills volcanic field; this map includes the western part of the field and the adjoining Red Desert Basin 30 x 60 Quadrangle includes the eastern part of the field. Approximately 0.7 km^3 (0.24 mi^3) of lamproite volcanic rocks erupted between 3.0 and 0.89 Ma (Lange and others, 2000), penetrating an appreciable thickness of Paleozoic and Mesozoic rocks and depositing onto a paleo-topography of exposed Upper Cretaceous and Tertiary sedimentary rocks. Description of units based on Hausel (2006); for a discussion of the geochemistry, mineralogy, petrology, origin, ages, and classification of these lamproites also see Hausel (2006)

Reference: Jones, R.W. and J.E. Scott. Geologic Map Of The Rock Springs 30' X 60' Quadrangle, Sweetwater County, Wyoming. Wyoming State Geological Survey Map Series, Open File Repot. [106]

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



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