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Overlook Occurrence (Denny Prospect; Iron Cliff), Highland District (Siberia District), Silver Bow Co., Montana, USA

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Latitude & Longitude (WGS84): 45° 49' 22'' North , 112° 27' 7'' West
Latitude & Longitude (decimal): 45.82278,-112.45194
Köppen climate type:BSk : Cold semi-arid (steppe) climate


REF:Deposit:: USBM RI 6334, P. 56-7
Deposit:: MBMG MEM 39, P. 42
Deposit:: MBMG BULL 72, P. 22
Deposit:: MBMG MEM 32, P. 47
Deposit:: 1963 COMPILE U.S.B.M. REPT. INV. 6334
Deposit:: MBM&G BULL 82,1970
Deposit:: ALSO SEE SEC 15,23,26,27 T1N,R7W
Commodities (Major) - Abrasive - Garnet, Molybdenum, Tungsten, Limestone - General; (Minor) - Copper, Gold, Silver
Deposit Type: Contact Metasomatic
Development Status: Occurrence
Host Rock Unit: Pioneer Batholith
Structure: Boulder Batholith, Fracture Zone Limestone Trends N40w, 41ne.
Host Rock: Limestone


Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.


Mineral List


6 valid minerals.

Rock Types Recorded

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Alphabetical List Tree Diagram

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

Lopingian - Tournaisian
252.17 - 358.9 Ma



ID: 2914288
Phosphoria Formation through Madison Group: Phosphoria, Quadrant, Amsden, Mission Canyon, and Lodgepole Formations

Age: Paleozoic (252.17 - 358.9 Ma)

Stratigraphic Name: Phosphoria Formation; Quadrant Formation; Amsden Formation; Mission Canyon Formation; Lodgepole Limestone

Description: Phosphoria Formation (Pp): Gray and tan dolomite, cherty limestone, bedded chert, siltstone, sandstone, and gray to black phosphatic and dolomitic shale. Marine shelf and offshore marine. Thickness as much as 255 m (837 ft). Quadrant Formation (PAq): Very light gray, yellowish or pinkish, well-sorted sandstone or quartzite, locally interbedded with subordinate limestone beds. Marine. Generally, thickness as much as 140 m (460 ft), but as much as 800 m(2,625 ft) in southwestern-most Montana. Amsden Formation (PAMa): Red shale, light gray limestone, and cherty and sandy limestone. Coastal plain or marine. Thickness as much as 180 m (590 ft). Mission Canyon Formation (Mmc): Gray, massive limestone with chert beds and nodules, and solution breccia zones. Shallow marine. Thickness as much as 520 m (1,706 ft). Lodgepole Formation (Ml): Woodhurst Member (upper part of formation): light gray, well-bedded limestone, typically with much dark chert, interbedded with thinner calcareous mudstone beds. Paine Member (middle part of formation):dark gray, thin-bedded, silty or fossiliferous limestone. Cottonwood Canyon Member (lower part of formation): black shale with basal conglomeratic lag deposit. Shallow marine. Thickness as much as 305 m (1000 ft).

Lithology: Major:{limestone,dolostone,shale}, Minor:{sandstone,siltstone,phosphatic shale,mudstone,black shale, conglomerate}, Incidental:{chert}

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]

Pennsylvanian - Late Mississippian
298.9 - 330.9 Ma



ID: 2133772
Quadrant Formation

Age: Carboniferous (298.9 - 330.9 Ma)

Lithology: Major:: {quartzitic sandstone, quartzite}; Minor:: {silty dolomite, sandy dolomite, micritic dolomite, dolomite, limestone, silty limestone, sandy limestone, micritic limestone, dolomitic sandstone, calcareous sandstone}

Reference: Zientek, M.L., P.D. Derkey, R.J. Miller, J.D. Causet et al. Spatial Databases for the Geology of the Northern Rocky Mountains - Idaho, Montana, and Washington. U.S. Geological Survey Open-File Report 2005-1235 Version 1.0. [25]

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



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