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 Easton, W.H., 1962, Carboniferous formations and faunas of central Montana: U.S. Geological Survey Professional Paper 348, 126 p.
Notes Reference has detailed descriptions at the beginning of each section on how to get to the specific sites.
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
Mk No. 1 of the Big Snowy group, Belt Creek 17N 06E 1 sec. 1 and 11, T. 17 N., R. 6 E. 47.26377612955 -110.906485442 TRS-SEC NAD83 114 16 sandstone, siltstone and shale interbedded, reddish with some green beds, weathers platy to hackly calcareous, slightly resistant 38 no
Mk No. 1 of the Big Snowy group, Belt Creek 17N 06E 1 47.26377612955 -110.906485442 TRS-SEC NAD83 114 mostly sandstone, reddish, some gypsum beds basal portion shaly and poorly exposed fine rather resistant 101 no
Mk No. 1 of the Big Snowy group, Belt Creek 17N 06E 11 sec. 1 and 11, T. 17 N., R. 6 E. 47.24878935005 -110.9277252485 TRS-SEC NAD83 114 16 sandstone, siltstone and shale interbedded, reddish with some green beds, weathers platy to hackly calcareous, slightly resistant 38 no
Mk No. 1 of the Big Snowy group, Belt Creek 17N 06E 11 47.24878935005 -110.9277252485 TRS-SEC NAD83 114 mostly sandstone, reddish, some gypsum beds basal portion shaly and poorly exposed fine rather resistant 101 no
Mk No. 2 Delpine section 09N 10E 14 sec. 14 T. 9 N., R. 10 E. 46.54134026535 -110.431512124 TRS-SEC NAD83 115 32 Interbedded sandstone shale, limestone, poorly exposed, partially cherty fine-very fine calcareous sub-angular 23 no
Mk No. 3 Judith River Section 13N 11E 25 CB NW 1/4 SW1/4 sec. 25, T. 13 N., R. 11 E. 46.8568025416 -110.279303056 TRS-SEC NAD83 116 22 pale lavender, very fine calcareous, friable 9 probably not
Mk No. 3 Judith River Section 13N 11E 25 CB 46.8568025416 -110.279303056 TRS-SEC NAD83 116 27 red with white blotches, irregular bedding, shaly, punky, very fine shaly, slightly resistant angular 7 no
Mk No. 5 Potter Creek Dome section 13N 21E 5 C SW1/4 sec. 5 T. 13 N., R.21 E. 46.91338198905 -109.094207936 TRS-SEC NAD83 119 49 White to buff fine calcareous subrounded 10 maybe
*dp No. 6 Durfee Creek Dome 12N 22E 24 A NE1/4 sec. 24, T. 12 N., R. 22 E. 46.7899534432 -108.887914654 TRS-SEC NAD83 119 4 light gray to white, beds about 8" thick, clean fine calcareous, porous, well rounded 7 yes
*Mt No. 6 Durfee Creek Dome 12N 22E 24 A 46.7899534432 -108.887914654 TRS-SEC NAD83 120 26 reddish brown, crossbedded, fine calcareous, resistant angular poorly 24 no
*Mt No. 6 Durfee Creek Dome 12N 22E 24 A 46.7899534432 -108.887914654 TRS-SEC NAD83 120 28 gray and light to dark brown, crossbedded, sun cracked, quartz sand to clay, hematite and magnetite clasts up to 1/4" diameter. Basal portion (1ft) is more well rounded and well sorted fine - medium quartz to clay poorly 32 no
*Mt No. 6 Durfee Creek Dome 12N 22E 24 A 46.7899534432 -108.887914654 TRS-SEC NAD83 120 31 white to light-gray, 1-2ft beds fine - medium resistant bluff maker well rounded well sorted 38 maybe
*Mt No. 6 Durfee Creek Dome 12N 22E 24 A 46.7899534432 -108.887914654 TRS-SEC NAD83 120 rusty brown, grading downwards to conglomerant, poorly stratified, slabby weathering, coarse porous subrounded to angular chert, quartz and iron oxide fragments 15 no
Mk No. 6 Durfee Creek Dome 12N 22E 24 A 46.7899534432 -108.887914654 TRS-SEC NAD83 121 75 sandstone and siltstone, gray to brown, thin bedded and some poorly exposed some calcareous, some porous subangular to rounded good to poor 16 probably not
Mk No. 6 Durfee Creek Dome 12N 22E 24 A 46.7899534432 -108.887914654 TRS-SEC NAD83 121 77 light-brown to reddish-brown, fine-medium calcareous, poorly cemented, porous angular poorly 5 no
Mk No. 6 Durfee Creek Dome 12N 22E 24 A 46.7899534432 -108.887914654 TRS-SEC NAD83 121 79 light brown, silty, poorly bedded fine calcareous 1 no
Mk No. 6 Durfee Creek Dome 12N 22E 24 A 46.7899534432 -108.887914654 TRS-SEC NAD83 121 81 red, poorly cemented, 4" to 2' beds medium very calcareous, porous subangular quartz to well rounded chert 11 no
Mk No. 6 Durfee Creek Dome 12N 22E 24 A 46.7899534432 -108.887914654 TRS-SEC NAD83 121 87 sandstone and sandy limestone, yellowish, platy, ripple-marked, argillaceous, irregular thin beds, weathers readily 12 no
*dp No. 7 State Road 25 and Stonehouse Canyon Section 11N 21E 31 BN2 N1/2 NW1/4 sec. 31, T. 11 N., R. 21 E. 46.6751249246 -109.1322435 TRS-SEC NAD83 122 4 white to mottled gray and pink, poorly bedded, quartz sand locally quartzitic to cherty, clean quartz sand medium non-calcareous, porous, upper 6' friable and nodular well sorted 18 yes
*dp No. 7 State Road 25 and Stonehouse Canyon Section 11N 21E 31 BN2 46.6751249246 -109.1322435 TRS-SEC NAD83 122 5 interbedded sandstone, siltstone and dolomite, sandstone is white,gray, pink and purple. fine - medium mostly calcareous, friable, unresistant 35 maybe
*Mt No. 7 State Road 25 and Stonehouse Canyon Section 11N 21E 31 BN2 46.6751249246 -109.1322435 TRS-SEC NAD83 123 33 white, gray, brownish, mostly poorly exposed, upper part (6') mud cracked and ripple marked, lower part massive, crossbedded fine - medium half calcareous, porous at bottom 21 no
Mk No. 7 State Road 25 and Stonehouse Canyon Section 11N 21E 31 BN2 46.6751249246 -109.1322435 TRS-SEC NAD83 124 87 gray to yellowish and brown, beds as thick as 3' fine - medium some calcareous in lower half, partly friable, porous 23 maybe
Mk No. 7 State Road 25 and Stonehouse Canyon Section 11N 21E 31 BN2 46.6751249246 -109.1322435 TRS-SEC NAD83 124 89 yellow to gray with pink mottlings, impure, quartz sand fine - medium calcareous poorly 16 no
Mk No. 7 State Road 25 and Stonehouse Canyon Section 11N 21E 31 BN2 46.6751249246 -109.1322435 TRS-SEC NAD83 124 91 mottled pink and yellowish gray, quartz sand medium calcareous, porous poorly 28 no
Mk No. 7 State Road 25 and Stonehouse Canyon Section 11N 21E 31 BN2 46.6751249246 -109.1322435 TRS-SEC NAD83 124 93 greenish - yellow and brown, impure, quartz sand medium calcareous poorly 3 no
Mk No. 7 State Road 25 and Stonehouse Canyon Section 11N 21E 31 BN2 46.6751249246 -109.1322435 TRS-SEC NAD83 124 95 yellow or mottled red, gray, and yellow, very fine - medium grained friable, porous, unresistant some grains rounded and frosted 19 maybe
Mk No. 7 State Road 25 and Stonehouse Canyon Section 11N 21E 31 BN2 46.6751249246 -109.1322435 TRS-SEC NAD83 124 97 yellow, upper 3/4 grades upward from light brown to purple. Shaly siltstone into impure sandstone fine calcareous, 21 no
Mk No. 7 State Road 25 and Stonehouse Canyon Section 11N 21E 31 BN2 46.6751249246 -109.1322435 TRS-SEC NAD83 124 99 light yellow to light brown, mostly with black spots that may be dried oil fine calcareous 12 probably not