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 Robinson, G. D., 1963, Geology of the Three Forks Quadrangle Montana: Geological Survey Professional Paper 370, 143 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
*q Section A 02N 01W 25 A NE corner, sec 25, T 2n, R. 1W. and into the SE corner of sec 24. 45.89968319335 -111.664946771 TRS-SEC NAD83 126 Quartzitic sandstone, thick bedded, wide range of pale colorful grays which weather yellow. Ledge forming medium to coarse mix of silica and carbonate cement rounded 85 yes
*q Section A 02N 01W 25 A 45.89968319335 -111.664946771 TRS-SEC NAD83 126 Mostly covered but like above with similar sandstone float and little silty limestone 150 maybe
*q Section A 02N 01W 25 A 45.89968319335 -111.664946771 TRS-SEC NAD83 126 Sandstone and limestone, beds a few feet thick of sanstone like that in A-49. Sandstone ledge 9 tf thick at top. Gradation between the quadrant and amsden. 24 no
_f Section A 02N 01W 10 Sec.10, T. 1N., R 1W. 45.93994228105 -111.711143127 TRS-SEC NAD83 129 Quarzitic sandstone, thinly crossbedded, orange/pink grayish and reddish, nearly pure quartz sand tinted with iron oxides, Few conglomerate lentils, ledge forming coarse to medium Flaggy, siliceous 9 maybe
_f Section A 02N 01W 10 45.93994228105 -111.711143127 TRS-SEC NAD83 129 Like above but coarser grained coarse less cemented than above 26 yes
*q Section C 3N 2E 29 CC SW 1/4 SW 1/4 sec. 29, T. 3N., R. 2E. And trends SE to NE1/4 NW1/4 sec. 32, T. 3N., R. 2E. 45.97817084435 -111.5112621415 TRS-SEC NAD83 132 Brecciated and sheared sandstone and quartzite, thick bedded with few thin beds of dark chert 30 no
*q Section C 3N 2E 30 CC SW 1/4 SW 1/4 sec. 29, T. 3N., R. 2E. And trends SE to NE1/4 NW1/4 sec. 32, T. 3N., R. 2E. 45.97782475935 -111.5308805685 TRS-SEC NAD83 Quartzitic sandstone, thick-bedded, white to yellowish gray, few grayish yellow limestone beds 1-3 ft thick medium 100 yes
*q Section D 01N 01W 34 DB NW1/4, SE1/4, sec. 34, T. 1N., R. 1W., 45.79226112325 -111.708107236 TRS-SEC NAD83 133 Quartzitic sandstone, thin-thick bedded, yellowish gray, includes a few thin beds of white limestone medium mainly quartz, but a little calcareous cement also 157 maybe
*Ma Section D 01N 01W 34 DB 45.79226112325 -111.708107236 TRS-SEC NAD83 133 Quartzitic and calcareous sandstone, thick bedded, pinkish gray, dark -yellowish orange and pale yellowish-brown. Quartz cemented beds contain ovoid mottles medium alternating quartz and calcite cement 79 maybe
*Ma Section D 01N 01W 34 DB 45.79226112325 -111.708107236 TRS-SEC NAD83 133 Quartzitic sandstone, thick bedded, yellowish orange, with a few pebbles of yellowish gray siltstone medium quartz 8 probably not
_f Section D 01S 01W 8 E1/2 se. 8, T. 1S., R. 1W., 45.7649107509 -111.751959 TRS-SEC NAD83 135 Quartzitic sandstone, thick bedded, varying color - grayish orange, pink/ grayish and yellow gray, Near top a few thin laminae of yellowish gray hornfelsed shale. Low ledge forming medium - coarse near top quartz 38 maybe