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Foley Mountain, Bald Mountain District, Lawrence Co., South Dakota, USA

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Latitude & Longitude (WGS84): 44° 20' 4'' North , 103° 51' 30'' West
Latitude & Longitude (decimal): 44.33470,-103.85838
GeoHash:G#: 9xyhhwusk
Locality type:Mountain
Köppen climate type:Dfb : Warm-summer humid continental climate


Grorudites 4 miles west of Lead.

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


1 valid mineral.

Detailed Mineral List:

Aegirine
Formula: NaFe3+Si2O6
Reference: SDSMT Bull 18 Roberts and Rapp "Mineralogy of the Black Hills"

List of minerals arranged by Strunz 10th Edition classification

Group 9 - Silicates
'Aegirine'9.DA.25NaFe3+Si2O6

List of minerals arranged by Dana 8th Edition classification

Group 65 - INOSILICATES Single-Width,Unbranched Chains,(W=1)
Single-Width Unbranched Chains, W=1 with chains P=2
Aegirine65.1.3c.2NaFe3+Si2O6

List of minerals for each chemical element

OOxygen
O AegirineNaFe3+Si2O6
NaSodium
Na AegirineNaFe3+Si2O6
SiSilicon
Si AegirineNaFe3+Si2O6
FeIron
Fe AegirineNaFe3+Si2O6

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

Eocene - Paleocene
33.9 - 66 Ma



ID: 2767309
Trachytic Intrusive Rocks

Age: Paleogene (33.9 - 66 Ma)

Description: Tan to reddish-brown, iron-stained stocks, laccoliths, sills, and dikes of trachyte, quartz trachyte, and alkalic rhyolite. Contains phenocrysts of sanidine, orrthoclase, anorthoclase, aegirine-augite and biotite in a finely crystalline orthoclase-quartz biotite groundmass.

Lithology: Major:{hypabyssal trachyte,hypabyssal quartz trachyte,hypabyssal rhyolite}

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]

Eocene - Paleocene
33.9 - 66 Ma



ID: 2473569
Alkali rhyolitic intrusive rocks

Age: Paleogene (33.9 - 66 Ma)

Description: Tan to gray, containing phenocrysts of alkali feldspar and quartz. Forms sills.

Reference: Redden, J.A., E. DeWitt. Maps Showing Geology, Structure, and Geophysics of the Central Black Hills, South Dakota. U.S. Geological Survey Scientific Investigations Map 2777. [73]

Permian - Devonian
251.902 - 419.2 Ma



ID: 3190647
Paleozoic sedimentary rocks

Age: Phanerozoic (251.902 - 419.2 Ma)

Lithology: Sedimentary rocks

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. [154]

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


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