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 Vine, J.D., 1956, Geology of the Stanford-Hobson area, central Montana: U.S. Geological Survey Bulletin 1027-J, p. 405-467.
Notes Page 416 contains well log information which describes the Kibbey Formation as sandstones that are typically very fine grained to silty but there is one 15 ft section containing white, fine to medium grained sandstone.
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 1]Big Snowy Group north of Woodhurst Mountain 14N 11E 2 sec. 2, T. 14 N., R. 11 E. 47.00361614395 -110.2930808845 TRS-SEC NAD83 420 Sandstone, yellow and yellowish gray, fine 125 maybe
*Mt 2] Big Snowy Group and Amsden formation on the Southwest side of the Blacktail Hills 15N 11E sec. 19 and 30, T. 15 N., R. 11 E. 420 Sandstone, light brown, thin bedded to massive friable 90 yes
*Mt 2] Big Snowy Group and Amsden formation on the Southwest side of the Blacktail Hills 15N 11E 420 Sandstone, light brown, massive friable 120 yes
Mk 2] Big Snowy Group and Amsden formation on the Southwest side of the Blacktail Hills 15N 11E 421 sandstone, light yellow, mostly covered, basal 25-50 ft is red siltstone, quartz sandstone in upper part followed by 20ft of gypsum fine friable in upper part 250 maybe
*Mt 3]Heath Shale and Amsden Formation Skull Butte Dome 15N 12E 6 sec. 6, T. 15 N., R. 12 E. 47.09083957135 -110.2523473945 TRS-SEC NAD83 423 sandstone, red, arkosic, shell fragments, quartz grains, chert and limestone pebbles coarse 15.5 no
*Mt 3]Heath Shale and Amsden Formation Skull Butte Dome 15N 12E 6 47.09083957135 -110.2523473945 TRS-SEC NAD83 423 Sandstone, brown, ferruginous somewhat friable 5 maybe
*Mt 4] Upper part of Heath shale and Amsden Formation east of Lone Tree Creek 16N 10E 3 sec. 3, T. 16 N., R. 10 E. 47.1770743612 -110.4424808525 TRS-SEC NAD83 426 sandstone, red, ferruginous, partly covered 38 maybe
*Mt 4] Upper part of Heath shale and Amsden Formation east of Lone Tree Creek 16N 10E 3 sec. 3, T. 16 N., R. 10 E. 47.1770743612 -110.4424808525 TRS-SEC NAD83 426 sandstone, white, red and yellow, cross bedded , ledge forming friable 60 yes
*Mt 5] Upper part of Heath shale and Amsden Formation and lower part of Ellis Group, north west of Surpirse Creek 16N 10E 12 sec. 12, T. 16 N., R. 10 E. 47.16265225465 -110.3995993185 TRS-SEC NAD83 426 Sandstone, red, cross bedded ledge forming coarse 62 maybe
*Mt 6] Amsden Formation South of Surprise Creek 16N 11E 18 sec. 18, T. 16 N., R. 11 E. 47.1482236931 -110.378661152 TRS-SEC NAD83 427 Sandstone, red and locally mottled with white, ferruginous, cross bedded somewhat friable 36 maybe
*Mt 7] Upper part of Amsden formation along Dry Wolf Creek 15N 11E 5 sec. 5, T. 15 N., R. 11 E. 47.09043690255 -110.3578474715 TRS-SEC NAD83 427 Sandstone red 3 no
*Mt 7] Upper part of Amsden formation along Dry Wolf Creek 15N 11E 5 47.09043690255 -110.3578474715 TRS-SEC NAD83 427 sandstone, yellow, ripple marked , w/ some red shale partings 22 no
*Mt 7] Upper part of Amsden formation along Dry Wolf Creek 15N 11E 5 47.09043690255 -110.3578474715 TRS-SEC NAD83 427 sandstone, yellow to white, massive to cross bedded, ledge forming medium somewhat friable 22 yes
*Mt 7] Upper part of Amsden formation along Dry Wolf Creek 15N 11E 5 47.09043690255 -110.3578474715 TRS-SEC NAD83 427 Sandstone, brown, beds 0.5-3 ft thick w/ black shale partings ~4ft thick 54 no
*Mt 7] Upper part of Amsden formation along Dry Wolf Creek 15N 11E 5 47.09043690255 -110.3578474715 TRS-SEC NAD83 427 Sandstone, brown to white, massive - crossbedded, fine somewhat friable 34 yes
*Mt 8] Upper part of Heath shale and the Amsden Formation, northwest side of Willow creek 15N 11E 34 sec. 34 and 35, T. 15 N., R. 11 E. 47.01804544085 -110.3149286415 TRS-SEC NAD83 428 Sandstone, white to orange friable 5 yes
*Mt 8] Upper part of Heath shale and the Amsden Formation, northwest side of Willow creek 15N 11E 34 47.01804544085 -110.3149286415 TRS-SEC NAD83 428 sandstone, white-orange-red color varied rapidly in all directions, bedded medium 64 yes
*Mt 8] Upper part of Heath shale and the Amsden Formation, northwest side of Willow creek 15N 11E 34 47.01804544085 -110.3149286415 TRS-SEC NAD83 428 Sandstone, gray, massive friable 18 yes
*Mt 8] Upper part of Heath shale and the Amsden Formation, northwest side of Willow creek 15N 11E 34 47.01804544085 -110.3149286415 TRS-SEC NAD83 428 Sanstone, brown, weathers into large rough surfaced blocks medium to coarse 15 maybe
*Mt 8] Upper part of Heath shale and the Amsden Formation, northwest side of Willow creek 15N 11E 34 47.01804544085 -110.3149286415 TRS-SEC NAD83 428 Sandstone , red, locally conglomeratic, hematitic, breaks into angular fragments coarse 38.5 no
*Mt 8] Upper part of Heath shale and the Amsden Formation, northwest side of Willow creek 15N 11E 35 sec. 34 and 35, T. 15 N., R. 11 E. 47.0181802687 -110.293712735 TRS-SEC NAD83 428 Sandstone, white to orange friable 5 yes
*Mt 8] Upper part of Heath shale and the Amsden Formation, northwest side of Willow creek 15N 11E 35 47.0181802687 -110.293712735 TRS-SEC NAD83 428 sandstone, white-orange-red color varied rapidly in all directions, bedded medium 64 yes
*Mt 8] Upper part of Heath shale and the Amsden Formation, northwest side of Willow creek 15N 11E 35 47.0181802687 -110.293712735 TRS-SEC NAD83 428 Sandstone, gray, massive friable 18 yes
*Mt 8] Upper part of Heath shale and the Amsden Formation, northwest side of Willow creek 15N 11E 35 47.0181802687 -110.293712735 TRS-SEC NAD83 428 Sanstone, brown, weathers into large rough surfaced blocks medium to coarse 15 maybe
*Mt 8] Upper part of Heath shale and the Amsden Formation, northwest side of Willow creek 15N 11E 35 47.0181802687 -110.293712735 TRS-SEC NAD83 428 Sandstone , red, locally conglomeratic, hematitic, breaks into angular fragments coarse 38.5 no
Jsw 9] Ellis group, Amsden Formation, Otter formation, on East Buffalo Creek 12N 16E 11 sec. 11 and 14, T. 12 N., R. 16 E. 46.81728533665 -109.6718101575 TRS-SEC NAD83 428 Sandstone, brown, glauconitic fine 75 no
*Mt 9] Ellis group, Amsden Formation, Otter formation, on East Buffalo Creek 12N 16E 11 46.81728533665 -109.6718101575 TRS-SEC NAD83 428 Sanstone, yellowish orange, thin bedded fine 9 no
*Mt 9] Ellis group, Amsden Formation, Otter formation, on East Buffalo Creek 12N 16E 11 46.81728533665 -109.6718101575 TRS-SEC NAD83 428 Sandstone, grayish orange very fine 6 no
*Mt 9] Ellis group, Amsden Formation, Otter formation, on East Buffalo Creek 12N 16E 11 46.81728533665 -109.6718101575 TRS-SEC NAD83 429 Sandstone, grayish orange very fine 22 no
*Mt 9] Ellis group, Amsden Formation, Otter formation, on East Buffalo Creek 12N 16E 11 46.81728533665 -109.6718101575 TRS-SEC NAD83 429 Sandstone, grayish orange, quartzose, scattered limonite stains 3 maybe
Jsw 9] Ellis group, Amsden Formation, Otter formation, on East Buffalo Creek 12N 16E 14 sec. 11 and 14, T. 12 N., R. 16 E. 46.8026769237 -109.671691582 TRS-SEC NAD83 428 Sandstone, brown, glauconitic fine 75 no
*Mt 9] Ellis group, Amsden Formation, Otter formation, on East Buffalo Creek 12N 16E 14 46.8026769237 -109.671691582 TRS-SEC NAD83 428 Sanstone, yellowish orange, thin bedded fine 9 no
*Mt 9] Ellis group, Amsden Formation, Otter formation, on East Buffalo Creek 12N 16E 14 46.8026769237 -109.671691582 TRS-SEC NAD83 428 Sandstone, grayish orange very fine 6 no
*Mt 9] Ellis group, Amsden Formation, Otter formation, on East Buffalo Creek 12N 16E 14 46.8026769237 -109.671691582 TRS-SEC NAD83 429 Sandstone, grayish orange very fine 22 no
*Mt 9] Ellis group, Amsden Formation, Otter formation, on East Buffalo Creek 12N 16E 14 46.8026769237 -109.671691582 TRS-SEC NAD83 429 Sandstone, grayish orange, quartzose, scattered limonite stains 3 maybe
*Mt 10] Upper part of the Otter formation and the Amsden formation, exposed on Antelope Creek 12N 16E 9 sec. 9 and 16., T. 12 N., R. 16 E. 46.817386055 -109.7140270435 TRS-SEC NAD83 429 Sandstone, brown and yellow, cross bedded and partly covered medium friable 70 yes
*Mt 10] Upper part of the Otter formation and the Amsden formation, exposed on Antelope Creek 12N 16E 9 46.817386055 -109.7140270435 TRS-SEC NAD83 429 Sandstone and conglomerate, red, partly covered 110 no
*Mt 10] Upper part of the Otter formation and the Amsden formation, exposed on Antelope Creek 12N 16E 16 sec. 9 and 16., T. 12 N., R. 16 E. 46.80266155825 -109.7139708795 TRS-SEC NAD83 429 Sandstone, brown and yellow, cross bedded and partly covered medium friable 70 yes
*Mt 10] Upper part of the Otter formation and the Amsden formation, exposed on Antelope Creek 12N 16E 16 46.80266155825 -109.7139708795 TRS-SEC NAD83 429 Sandstone and conglomerate, red, partly covered 110 no
Jsw 11] Ellis group and the upper part of the Amsden formation on a branch of Wait Creek 13N 12E 1 sec. 1, T. 13 N., R. 12 E. 46.9169338291 -110.1451973035 TRS-SEC NAD83 433 sandstone, brown unfossiliferous medium 15 maybe
Jsw 11] Ellis group and the upper part of the Amsden formation on a branch of Wait Creek 13N 12E 1 46.9169338291 -110.1451973035 TRS-SEC NAD83 433 sandstone, gray, cross bedded glauconitic, contains chert pebbles and oyster shells medium - coarse 20 no
Jsw 11] Ellis group and the upper part of the Amsden formation on a branch of Wait Creek 13N 12E 1 46.9169338291 -110.1451973035 TRS-SEC NAD83 433 sandstone, brown, thin bedded, glauconitic fine-medium 23 maybe
*Mt 11] Ellis group and the upper part of the Amsden formation on a branch of Wait Creek 13N 12E 1 46.9169338291 -110.1451973035 TRS-SEC NAD83 434 sandstone, white fine friable 3 yes
*Mt 11] Ellis group and the upper part of the Amsden formation on a branch of Wait Creek 13N 12E 1 46.9169338291 -110.1451973035 TRS-SEC NAD83 434 sandstone, white, bedded, fine friable 18 yes
*Mt 11] Ellis group and the upper part of the Amsden formation on a branch of Wait Creek 13N 12E 1 46.9169338291 -110.1451973035 TRS-SEC NAD83 434 Sandstone, white, only top exposed. fine friable maybe
Ke 19]Eagle Sandstone on the West side of the Judith river 18N 16E 6 sec. 6, T. 18 N., R. 16 E. 47.35234916135 -109.734585791 TRS-SEC NAD83 447 Sandstone, brown and white, massive friable 55 yes
Ke 19]Eagle Sandstone on the West side of the Judith river 18N 16E 6 47.35234916135 -109.734585791 TRS-SEC NAD83 447 Sandstone, brown and white, upper part forms massive white cliff 55 yes
Ke 19]Eagle Sandstone on the West side of the Judith river 18N 16E 6 47.35234916135 -109.734585791 TRS-SEC NAD83 447 Sandstone, brown and white, contains few black chert grains in addition to quartz and forms cliffs fine- medium friable maybe