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 Christie, H.H., 1961, Geology of the southern part of the Gravelly Range, southwestern Montana: Oregon State College, M.S. thesis, 159 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
Pp Phosphoria formation 12S 02W 2 C 44.8138682551 -111.8172700065 TRS-SEC NAD83 151 1 sandstone- light shades of reddish brown, weathers dark, fossils 17 maybe
Pp Phosphoria formation 12S 02W 2 C 44.8138682551 -111.8172700065 TRS-SEC NAD83 151 3 sandstone- gray, quartzitic; poorly exposed 50
Pp Phosphoria formation 12S 02W 2 C 44.8138682551 -111.8172700065 TRS-SEC NAD83 151 7 sandstone- quartzitic,contains chert nodules and stringers, light gray and light brown,chert is white to greyish yellow 4 no
Pp Phosphoria formation 12S 02W 2 C 44.8138682551 -111.8172700065 TRS-SEC NAD83 152 12 sandstone- quartzitic, light brown to buff with chert stringers and veins crossing the bedding at right angles 22 maybe
Pp Phosphoria formation 12S 02W 2 C 44.8138682551 -111.8172700065 TRS-SEC NAD83 152 14 sandstone-quartzitic, light gray to light brown, massive conchoidal fracture 6 no
*q Quadrant Formation 12S 02W 27 Section along the west fork of the madison river 44.759601242 -111.8324376865 TRS-SEC NAD83 152 1 sandstone- yellowish brown, weathers light gray, medium bedded andpoorly exposed. 46
*q Quadrant Formation 12S 02W 27 44.759601242 -111.8324376865 TRS-SEC NAD83 152 3 Sandstone simialar to unit 1 82
*q Quadrant Formation 12S 02W 27 44.759601242 -111.8324376865 TRS-SEC NAD83 153 7 sandstone- light yellow to light gray to tan, crudely medium bedded medium calcareous 7 yes
_f Flathead Formation 12S 01W 31 B Section along the west fork of the madison river 44.7487927023 -111.776338169 TRS-SEC NAD83 159 1 Sandstone- tan, thin bedded, alternating with thin beds of glauconitic sandstone and green shales 19 no
_f Flathead Formation 12S 01W 31 B Section along the west fork of the madison river 44.7487927023 -111.776338169 TRS-SEC NAD83 159 2 sandstone- quartzitic,buff, medium bedded, cross bedded, intercalated with few thin green shale beds 35 maybe
_f Flathead Formation 12S 01W 31 B Section along the west fork of the madison river 44.7487927023 -111.776338169 TRS-SEC NAD83 159 3 sandstone-quartzitic, rusty yellow brown to dark red and dark gray, weathers darker, thin to thick bedded, clear quartz pebbles common at base of unit 76 maybe