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Perlite 1; 2; 3; and 4. Occurrence (Owners- Ray & Larry Ward; Elliston.), Powell Co., Montana, USA

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Latitude & Longitude (WGS84): 46° 31' 60'' North , 112° 26' 29'' West
Latitude & Longitude (decimal): 46.53333,-112.44139
Köppen climate type:Dfb : Warm-summer humid continental climate


COULD BE IN ANY OF THE FOLLOWING SECTIONS- 15, 13, 14, 22, 2
Commodities (Major) - Perlite
Development Status: Occurrence


Commodity List

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


No minerals currently recorded for this locality.

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

Early Cretaceous
100.5 - 145 Ma



ID: 2138252
Kootenai Formation

Age: Early Cretaceous (100.5 - 145 Ma)

Lithology: Major:: {(freshwater limestone, shale, siltstone, sandstone)| (mudstone, siltstone, shale, sandstone)| (chert-rich sandstone, conglomeratic sandstone), shale, mudstone, siltstone, limestone, dolomite}; Minor:: {(dolomite)| (sandstone, siltstone)| (vitreous quartzite)}

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]

Hauterivian - Bajocian
129.4 - 170.3 Ma



ID: 2912051
Morrison Formation and Ellis Group

Age: Mesozoic (129.4 - 170.3 Ma)

Stratigraphic Name: Morrison Formation; Ellis Group

Description: Morrison Formation (Jm): Green, gray, or red mudstone and marlstone with subordinate limestone and sandstone beds. Upper part Neocomian age in central Montana and contains carbonaceous black shale and coal. Fluvial, paludal, and lacustrine. Thickness as much as 180 m (590 ft). Ellis Group (Je) - Swift Formation (Jsw): Orangish brown, glauconitic, flaggy-bedded, commonly fossiliferous, fine-grained sandstone or sandy coquina with subordinate dark gray shale interbeds; chert pebbles common. In west-central and northwestern Montana, a dark gray, noncalcareous, micaceous shale forms the lower part of the formation, commonly with a basal chert-pebble conglomerate or conglomeratic sandstone as much as 3 m (10 ft) thick. Shallow marine. Thickness as much as 70 m (230 ft). Rierdon Formation (Jr): Gray, locally fossiliferous limestone that may contain floating grains of quartz sand, interbedded with greenish gray limy shale. Lagoonal and marine shelf. Thickness as much as 105 m (344 ft). Sawtooth Formation: Western Montana: dark gray, platy to shaly, dense limestone with local basal conglomerate. Central Montana: upper calcareous siltstone, middle dark gray shale with thin limestone interbeds, and lower fine-grained sandstone. Three local members Bowes, Firemoon, and Tampico, in descending order. Bowes Member: dark gray to medium gray, calcareous mudstone, limestone, and quartzose sandstone. Firemoon Member: dark to medium gray, limestone and calcareous mudstone. Tampico Member: very light gray, well-sorted quartz sandstone and siltstone, and chert-pebble conglomerate. Shallow marine. Thickness as much as 205 m (673 ft). Piper Formation (Jp): Upper part: red mudstone and gypsum; middle part: gray shale, limestone, and dolomite; lower part: red mudstone and gypsum. Marine and restricted coastal evaporite basins. Thickness as much as 75 m (246 ft).

Lithology: Major:{limestone,mudstone,sandstone}, Minor:{shale,siltstone,marlstone,conglomerate,conglomerate sandstone, dolostone}, Incidental:{black shale, coal, chert, gypsum, coquina}

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]

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



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