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 Wilson, M.D., 1970, Cretaceous stratigraphy of the southern Madison and Gallatin Ranges, southwestern Montana: University of Idaho, Ph.D. dissertation, 55 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
kk Porcupine Ridge 07S 04E 21 DB Gallatin County 45.20843010435 -111.237925662 TRS-SEC NAD83 29 very light gray, hematite rich rims up to 1/4 inch thick, thin to thick bedded, splits slabby to blocky, forms cliffs and ledgy slopes fine clean, silicious well sorted 54 probably not
kk Porcupine Ridge 07S 04E 21 DB Gallatin County 45.20843010435 -111.237925662 TRS-SEC NAD83 27 ss. Pale red, weathers grayish red and pale reddish brown. Thin to medium bedded,forms an irregular cliff. Several hematite rinds like unit29 above. 12.199999999999999 no
kk Porcupine Ridge 07S 04E 21 DB Gallatin County 45.20843010435 -111.237925662 TRS-SEC NAD83 25 pale grayish red with brown specs, weathers grayish pink, medium to thick bedded, forms ledgy slopes, splits slabby to blocky fine 5.4000000000000004 no
kk Porcupine Ridge 07S 04E 21 DB Gallatin County 45.20843010435 -111.237925662 TRS-SEC NAD83 24 light grayish brown with brown and black specs, weater a very pale orange, thick bedded, slpits blocky, forms nearly bertical cliff, weathers to rubble 5 no
kk Porcupine Ridge 07S 04E 21 DB Gallatin County 45.20843010435 -111.237925662 TRS-SEC NAD83 22 light borwn to light gray at top, weathers with some iron staining, thin bedded, splits flaggy to slabby, forms ledgy slopes, contains few shaley lenses fine 17.600000000000001 no
kk Porcupine Ridge 07S 04E 21 DB Gallatin County 45.20843010435 -111.237925662 TRS-SEC NAD83 20 lightgray, in places reddish brown,forms ledgy slopes, massive fine well sorted 10.4 maybe
kk Porcupine Ridge 07S 04E 21 DB Gallatin County 45.20843010435 -111.237925662 TRS-SEC NAD83 6 light grayish brown, stained reddish brown, thin to medium bedded, forms ledgy slopes very fine silicious 6 no
kk Porcupine Ridge 07S 04E 21 DB Gallatin County 45.20843010435 -111.237925662 TRS-SEC NAD83 5 clean, white to very light gray, medium bedded forms ledges very fine slightly calcareous 8.5 probably not
kk Porcupine Ridge 07S 04E 21 DB Gallatin County 45.20843010435 -111.237925662 TRS-SEC NAD83 3 pinkish gray, weathers to moderate reddish orange, thin to medium bedded, splits flaggy to blocky, cross bedded coarse to very coarse 15.300000000000001 maybe