The data displayed below were collected during a joint project between the following departments at Montana Tech of The University of Montana: Geophysical Engineering and the Montana Bureau of Mines and Geology. The samples represent sandstones collected and analyzed for their potential use as proppant material.

General Information
Reference Mudge, M.R., 1972, Pre-Quaternary rocks in the Run River Canyon area, northwestern Montana: U.S. Geological Survey Professional Paper 663-A, 142 p.
Notes Measured sections of the Blackleaf Formation, Flood Member are on p. 26. The Flood contains many layers of sandstone and it is all noncalcareous, mostly composed of quartz, feldspar, and chert. Each section is very fine grained. Also most of it is interbedded with shale and contains granules of claystone.
Measured Section Details
Unit Symbol Name Township Range Section 1/4 Section Location Latitude Longitude Geomethod Datum Page Number Sub Unit Id Sandstone Description Grain Size Cementation Roundness Sorting Thickness (ft) Suitability
_f 3.Gordon Shale, Flathead Sandstone, and McNamara Formation 21N 11W 9 on west side of the upper reaches of Reef Creek about one mile south of Prairie Reef Lookout 47.5879021006 -113.0218056945 TRS-SEC NAD83 32 yellowish-gray, cross-bedded, iron stained, organic trails and burrows, fine to medium non calcareous 24 maybe
_f 3.Gordon Shale, Flathead Sandstone, and McNamara Formation 21N 11W 9 47.5879021006 -113.0218056945 TRS-SEC NAD83 31 yellowish-gray, iron stained, thin to thick bedded, vertical light gray veinlete=s in upper beds; organic trails and burrows medium to coarse poor 12.5 no
_f 3.Gordon Shale, Flathead Sandstone, and McNamara Formation 21N 11W 9 47.5879021006 -113.0218056945 TRS-SEC NAD83 30 same as 31 but cross bedded and has a thin gray shale bed medium to coarse poor 7 no
_f 3.Gordon Shale, Flathead Sandstone, and McNamara Formation 21N 11W 9 47.5879021006 -113.0218056945 TRS-SEC NAD83 29 same as 27 10 no
_f 3.Gordon Shale, Flathead Sandstone, and McNamara Formation 21N 11W 9 47.5879021006 -113.0218056945 TRS-SEC NAD83 28 same as 26 1 yes
_f 3.Gordon Shale, Flathead Sandstone, and McNamara Formation 21N 11W 9 47.5879021006 -113.0218056945 TRS-SEC NAD83 27 Shale and sandy shale, very finely micaceous, maroon, laminated very fine 4 no
_f 3.Gordon Shale, Flathead Sandstone, and McNamara Formation 21N 11W 9 47.5879021006 -113.0218056945 TRS-SEC NAD83 26 light yellowish gray, massive, crossbedded fine to medium poorly indurated 1.3 yes
_f 3.Gordon Shale, Flathead Sandstone, and McNamara Formation 21N 11W 9 47.5879021006 -113.0218056945 TRS-SEC NAD83 25 shale, sandy, very finely micaceous, marron, laminated, organic bioturbation very fine 3.7000000000000002 no
_f 3.Gordon Shale, Flathead Sandstone, and McNamara Formation 21N 11W 9 47.5879021006 -113.0218056945 TRS-SEC NAD83 24 same as 23, thin bedded, mud cracks, bioturbation poorly indurated poor 12.5 no
_f 3.Gordon Shale, Flathead Sandstone, and McNamara Formation 21N 11W 9 47.5879021006 -113.0218056945 TRS-SEC NAD83 23 yellowish-gray, massive, lower bed is mainly quartz pebble conglomerate, thinly laminated and cros bedded, some shale layers near bottom coarse poorly indurated poor 30 no
Kblf 18. Blackleaf, Kootenai, and Morrison Formations 23N 09W 34 B Exposed on west side of upper reaches of Hannan Gulch 47.70811434455 -112.750313751 TRS-SEC NAD83 47 finely micaceous, mostly chert quartz and feldspar, thin bedded in upper part, weathers yellowish gray and has red iron stains, faulted, forms prominent ridge very fine noncalcareous 30 no
Kblf 18. Blackleaf, Kootenai, and Morrison Formations 23N 09W 34 B 47.70811434455 -112.750313751 TRS-SEC NAD83 46 very thin bedded, mostly quartz, chert and feldspar, grey with greenish tint, thin sandy shale beds, limestone concretion in lower part, weathers blocky very time noncalcareous 29 no
Kblf 18. Blackleaf, Kootenai, and Morrison Formations 23N 09W 34 B 47.70811434455 -112.750313751 TRS-SEC NAD83 44 thin shale partings in upper and lower parts. Cross bedded, very light gray, clear quartz and some chert grains, , very thin bedded, weathers blocky, very fine noncalcareous, hard 12.6 no
Kblf 18. Blackleaf, Kootenai, and Morrison Formations 23N 09W 34 B 47.70811434455 -112.750313751 TRS-SEC NAD83 43 crossbedded gray, many lentiles of very coarse sandstone, mainly quartz feldspar and chert, many granules of claystone, ripple marked, and thin shale partings in lower part very fine noncalcareous, hard 6.9000000000000004 no
Kblf 19. Flood Shale member of the Blackleaf formation and the upper part of the Kootenai formation exposed in a gulch just SW of the east end of the Sheep Mountains 45 Sandstone (B bed), finely micaceous, yellowish gray, thin bedded, heavily iron stained, conchoidal fracture, wood fragments fine 28 no
Kblf 42 very thin bedded, like unit 38, lower beds transitional to shale 5 no
Kblf 38 Sandstone with shale partings, gray, very thin bedded, weathers yellowish gray, some cros bedding, heavily iron stained, weathers blocky very fine 24 no
Kblf 35 gray, weathers yellowish gray, one bed, weathers blocky very fine slightly calcareous 0.59999999999999998 no
Kblf 31 Sandstone (A bed) in beds up to 2.5' thick, heavily iron stained fine 19 maybe
Kblf 20.Flood shale member of the blackleaf formation 22N 08W 31 AA north side of irrigation canal in center NE,NE Teton County 47.6237501507 -112.67287127 TRS-SEC NAD83 11 sandstone with many shale partings in lower part, mainly clear quartz some chert grains, light gray in upper part, dark gray in lower, forms massive hillside bench with vertical cliff fine-very fine 22.5 maybe
Kblf 20.Flood shale member of the blackleaf formation 22N 08W 31 AA 47.6237501507 -112.67287127 TRS-SEC NAD83 10 many silty/shaly partings, dark-gray, lenticular and nodular beds, worms burrows very fine noncalcareous 18 no
Kblf 20.Flood shale member of the blackleaf formation 22N 08W 31 AA 47.6237501507 -112.67287127 TRS-SEC NAD83 7 dark-gray, blue tint on broken surfaces, weathers blocky, small organic burrows locally abundant very fine calcareous 0.59999999999999998 no
Kblf 20.Flood shale member of the blackleaf formation 22N 08W 31 AA 47.6237501507 -112.67287127 TRS-SEC NAD83 3 massive, dark gray, weathers brownish gray, upper part has platy weathering and wood fragments, lower part weathers blocky very fine calcareous no
Kblf 21. Flood shale member of the blackfoot formtation 21N 09W 19 west side of saddle between Dry Fork and Stovepipe Creek, Patricks Basin Quadrangle 47.55914724255 -112.808398439 TRS-SEC NAD83 4 sandstone with sandy shale interbeds, yellowish-gray, mostly quartz, ripple marks and organic burrows very fine 13.5 no
Kblf 21. Flood shale member of the blackfoot formtation 21N 09W 19 47.55914724255 -112.808398439 TRS-SEC NAD83 1 gray, thinly laminated, mostly quartz, weathers yellowish gray, asymmetrical ripple marks trending north fine to medium 6 maybe
Kv 37. Two medicene formation, Virgelle formation and Telegraph Creek formation 22N 08W 28 C,D In the north stream bank of the Sun river 47.62666320805 -112.641228882 TRS-SEC NAD83 24 Light-gray, crossbedded, thin bedded, composed of clear quartz and some chert, locally very micaceous, contains many sandstone concretions and nodules- some heavily iron stained and more resistant leaving pedestals; in uppermost bed there are rounded clay fine calcareous 149 yes