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 Cobban, W.E., Erdmann, C.E., Lemke, R.W., Maughan, E.K., 1976, Type sections and stratigraphy of the members of the Blackleaf and Marias River Formations (Cretaceous) of the Sweetgrass Arch, Montana: U.S. Geological Survey Professional Paper 974, 66 p.
Notes
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
Kblf Type section for Flood Member 20N 03E 7 ABC 4.5 miles west of Great falls 47.50601581475 -111.399923479 TRS-SEC NAD83 11 30 light yellowish grey, silty, thinly and irregularly bedded, weathers light brownish orange, some carbonaceous whisps fine 10.4 maybe
Kblf Type section for Flood Member 20N 03E 7 ABC 4.5 miles west of Great falls 47.50601581475 -111.399923479 TRS-SEC NAD83 12 29 medium light gray, salt and pepper, massive, weathers yellow gray stained with limonite, quartz and chert (3-2_ few brown grains in a matrix of secondary calcite quartz well to subrounded 1.1000000000000001 no
Kblf Type section for Flood Member 20N 03E 7 ABC 4.5 miles west of Great falls 47.50601581475 -111.399923479 TRS-SEC NAD83 12 28 concretionary, medium light gray, weathers yellowish brown to brown, contains small amounts of ferruginous material fine calcareous, secondary calcite 4.5 no
Kblf Type section for Flood Member 20N 03E 7 ABC 4.5 miles west of Great falls 47.50601581475 -111.399923479 TRS-SEC NAD83 12 27 grayish-yellow, bedding indistinct, thickness varies fine very friable 10 yes
Kblf Type section for Flood Member 20N 03E 7 ABC 4.5 miles west of Great falls 47.50601581475 -111.399923479 TRS-SEC NAD83 12 26 grayish yellow, some chert, cross bedded, mostly massive except 5 distinct parting planes, looks like near beach deposite medium well sorted 5.0999999999999996 yes
Kblf Type section for Flood Member 20N 03E 7 ABC 4.5 miles west of Great falls 47.50601581475 -111.399923479 TRS-SEC NAD83 12 25 grayish-yellow, indistinctly bedded fine friable,slightly calcareous 6.2000000000000002 yes
Kblf Type section for Flood Member 20N 03E 7 ABC 4.5 miles west of Great falls 47.50601581475 -111.399923479 TRS-SEC NAD83 12 24 grayish yellow, massive, weathers grayish -orange yellow, mostly quartz, top film of clay, forms a prominent ledge overhanging beds below fine - medium 12.6 maybe
Kblf Type section for Flood Member 20N 03E 7 ABC 4.5 miles west of Great falls 47.50601581475 -111.399923479 TRS-SEC NAD83 12 23 light-yellowish gray, indistinctly bedded, upper 36 cm weathers yllowish orange fairly friable and erodable 4.7000000000000002 maybe
Kblf Type section for Flood Member 20N 03E 7 ABC 4.5 miles west of Great falls 47.50601581475 -111.399923479 TRS-SEC NAD83 12 22 light olive gray, some flute casts and abundant casts of trace fossils fine hard to soft 2.2999999999999998 no
Kblf Type section for Flood Member 20N 03E 7 ABC 4.5 miles west of Great falls 47.50601581475 -111.399923479 TRS-SEC NAD83 12 21 light gray, silty, some finely macerated carbonaceous debris; nodular or chunky appearance, trace fossils on bedding surfaces, fine poorly 3.2000000000000002 no
Kblf Type section for Flood Member 20N 03E 7 ABC 4.5 miles west of Great falls 47.50601581475 -111.399923479 TRS-SEC NAD83 12 20 Light gray, silty, few rounded granules of dark chert, nodular or chunky, occasional dicrete masses of concretionary marcasite silty poorly 4.5999999999999996 no
Kblf Type section for Flood Member 20N 03E 7 ABC 4.5 miles west of Great falls 47.50601581475 -111.399923479 TRS-SEC NAD83 12 12 yellowish gray, upper surface ripple marked, ferruginous, weathers mediun brown, lower part silty anc contains small fragments for mineral charcoal and trace fossils. medium 2 no
Kblf Type section for Flood Member 20N 03E 7 ABC 4.5 miles west of Great falls 47.50601581475 -111.399923479 TRS-SEC NAD83 12 10 light gray, slightly ferruginous, alternating beds with siltstone. Crossbedded, forms a ragged cliffy slope fine - medium more indurated better than in lower part of unit 3.7000000000000002 no
Kblf Type section for Flood Member 20N 03E 7 ABC 4.5 miles west of Great falls 47.50601581475 -111.399923479 TRS-SEC NAD83 12 8 light olive gray, quartzose, interbedded with about equal amounts of shaly siltstone with laminae marked by films of carbonaceous matter, , trace poorly preserved fossils, lentils of shaly siltstone, 3.2000000000000002 probably not
Kblf Reference section of Flood Member 21N 03E 32 DCC 47.52530185065 -111.3761285625 TRS-SEC NAD83 13 61 moderately gray, concretionary.Concretions (large) are epigenetic and occupy scour channels in underlyins sandstone fine calcareous 5.5999999999999996 no
Kblf Reference section of Flood Member 21N 03E 32 DCC 47.52530185065 -111.3761285625 TRS-SEC NAD83 13 60 light yellowish gray, Irregular wavy bedding, parted my laminae of medium gray shale fine calcareous 10.699999999999999 no
Kblf Reference section of Flood Member 21N 03E 32 DCC 47.52530185065 -111.3761285625 TRS-SEC NAD83 13 59 Similar to 56, fine horizontal laminae, no cross lamination poorly 0.5 no
Kblf Reference section of Flood Member 21N 03E 32 DCC 47.52530185065 -111.3761285625 TRS-SEC NAD83 13 58 grayish orange, similar to upper part of unit 53 fine calcareous 4.2999999999999998 probably not
Kblf Reference section of Flood Member 21N 03E 32 DCC 47.52530185065 -111.3761285625 TRS-SEC NAD83 13 57 light yellowish gray, cherty, tuffaceous, cross laminated and makes ledge fine to coarse poorly 1.3999999999999999 no
Kblf Reference section of Flood Member 21N 03E 32 DCC 47.52530185065 -111.3761285625 TRS-SEC NAD83 13 56 grayish orange, similar to upper part of unit 53 fine 2 no
Kblf Reference section of Flood Member 21N 03E 32 DCC 47.52530185065 -111.3761285625 TRS-SEC NAD83 13 55 light yellowish gray, massive, makes ledge with small overhang medium hard 1.2 no
Kblf Reference section of Flood Member 21N 03E 32 DCC 47.52530185065 -111.3761285625 TRS-SEC NAD83 13 54 light yellowish gray, weathers grayish orange, irregular wavy layers with laminae of shale fine calcaerous 6.7000000000000002 no
Kblf Reference section of Flood Member 21N 03E 32 DCC 47.52530185065 -111.3761285625 TRS-SEC NAD83 13 53 Like 54 but fresh, light yellowish gray, unweathered. Makes top of excavated slope fine calcareous 8.5 no
Kblf Reference section of Flood Member 21N 03E 32 DCC 47.52530185065 -111.3761285625 TRS-SEC NAD83 13 52 olive gray, contains irregular masses and partings of medium gray shale medium soft poorly 1.5 no
Kblf Reference section of Flood Member 21N 03E 32 DCC 47.52530185065 -111.3761285625 TRS-SEC NAD83 13 51 light gray, massive with trace fossils fine hard 0.29999999999999999 no
Kblf Reference section of Flood Member 21N 03E 32 DCC 47.52530185065 -111.3761285625 TRS-SEC NAD83 13 50 light gray, thin parting of medium gray fissile shale fine 3.2999999999999998 no
Kblf Reference section of Flood Member 21N 03E 32 DCC 47.52530185065 -111.3761285625 TRS-SEC NAD83 13 48 light gray, traces of carbonaceous debris. Small lenticular and nodular masses enclosed by sandy gray clay, indistinct bedding, ledge making fine faintly calcareous, resistant 5.5 no
Kblf Reference section of Flood Member 21N 03E 32 DCC 47.52530185065 -111.3761285625 TRS-SEC NAD83 13 46 olive, massive, irregular inclusions of shale soft 2 probably not
Kblf Reference section of Flood Member 21N 03E 32 DCC 47.52530185065 -111.3761285625 TRS-SEC NAD83 13 45 light yellowish gray, small amount of rounded polished black chert, flakes of carbonaceous material, small lenticular and nodular masses some enclosed by clay, very indistinct bedding, make broken rubbly ledge. fine - medium hard, faintly calcareous 1.8999999999999999 no
Kblf Reference section of Flood Member 21N 03E 32 DCC 47.52530185065 -111.3761285625 TRS-SEC NAD83 13 41 light olive gray, surface weathers dark yellowish orange, some rounded granules of gray chert, all in a martix of light gray clay which also marks indistinct laminae fine to coarse non calcareous, soft, friable subangular poorly 0.40000000000000002 no
Kblf Reference section of Flood Member 21N 03E 32 DCC 47.52530185065 -111.3761285625 TRS-SEC NAD83 13 39 olive gray, thin slabby layers fine 0.90000000000000002 no
Kblf Reference section of Flood Member 21N 03E 32 DCC 47.52530185065 -111.3761285625 TRS-SEC NAD83 14 37 olive gray, finely laminated,weathers brown, presence of bioturbation fine 0.40000000000000002 no
Kblf Reference section of Flood Member 21N 03E 32 DCC 47.52530185065 -111.3761285625 TRS-SEC NAD83 14 34 light olive gray, massive, poorly stratified, weathers light yellowish brown to dark yellowish orange, organically reworked, burrows filled with clay shale, fine poorly 2.3999999999999999 no
Kblf Reference section of Flood Member 20N 03E 5 AAB 47.5234408756 -111.3742484665 TRS-SEC NAD83 14 24 light yellowish brown, layers 9-15cm thick parted by thin laminae of medium gray siltstone. Trace fossils in upper part, fine 3.7999999999999998 no
Kblf Reference section of Flood Member 20N 03E 5 AAB 47.5234408756 -111.3742484665 TRS-SEC NAD83 14 22 light yellowish gray, interbedded with light olive sandy siltstone, uper surfaces show fossils fine 1.2 no
Kblf Reference section of Flood Member 20N 03E 5 AAB 47.5234408756 -111.3742484665 TRS-SEC NAD83 14 20 light yellowih gray,small flakes of carbonaceous debris, finely laminated layers separated by 6mm thick laminae of light gray siltstone. Makes subduedledge with slightly undulating top fine faintly calcareous, hard, resistant 2.2000000000000002 no
Kblf Reference section of Flood Member 20N 03E 5 AAB 47.5234408756 -111.3742484665 TRS-SEC NAD83 14 19 light yellowish gray, layers interbedded with siltstone, bedding maked by thing laminae of clay, fragmented trace fossils very fine 1.3999999999999999 no
Kblf Reference section of Flood Member 20N 03E 5 AAB 47.5234408756 -111.3742484665 TRS-SEC NAD83 14 18 light olive, silty very fine 0.90000000000000002 no