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 Childers, M.O., 1960, Structure and stratigraphy of the southwest Marias Pass area, Flathead County, Montana: Princeton University, Ph.D. dissertation, 181 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 Challenge Creek 29N 13W 32 1.5 miles upstream from Challenge Cabin 48.23046825455 -113.325175728 TRS-SEC NAD83 179 indistinct bedding, gray green, argillaceous very fine 10 no
kk Challenge Creek 29N 13W 32 1.5 miles upstream from Challenge Cabin 48.23046825455 -113.325175728 TRS-SEC NAD83 179 indistinct bedding, gray green, argillaceous fine 8 no
kk Challenge Creek 29N 13W 32 1.5 miles upstream from Challenge Cabin 48.23046825455 -113.325175728 TRS-SEC NAD83 179 massive, some beds finely laminated, many fractures and slickenslides, carbon films on some laminae fine calcareous 96 probably not
kk Challenge Creek 29N 13W 32 1.5 miles upstream from Challenge Cabin 48.23046825455 -113.325175728 TRS-SEC NAD83 179 massive, green, agrillaceous fine 5 no
kk Challenge Creek 29N 13W 32 1.5 miles upstream from Challenge Cabin 48.23046825455 -113.325175728 TRS-SEC NAD83 180 medium bedded with thin shaley interbeds, green, agrillaceous and micaceous, silty fine 11 no
kk Challenge Creek 29N 13W 32 1.5 miles upstream from Challenge Cabin 48.23046825455 -113.325175728 TRS-SEC NAD83 180 very thick bedded, green gray, silty and micaceous fine 14 no
kk Challenge Creek 29N 13W 32 1.5 miles upstream from Challenge Cabin 48.23046825455 -113.325175728 TRS-SEC NAD83 180 thick to very thick bedding with thin shaley interbeds, gray-green, carbonaceous, silty fine, several beds medium to coarse 85 no
kk Challenge Creek 29N 13W 32 1.5 miles upstream from Challenge Cabin 48.23046825455 -113.325175728 TRS-SEC NAD83 180 massive, blocky, gray-green, contains numerbous black chert grains medium 47 maybe
kk Challenge Creek 29N 13W 32 1.5 miles upstream from Challenge Cabin 48.23046825455 -113.325175728 TRS-SEC NAD83 180 thick bedded, yellow-green, silty with several cross laminated beds, concentrated calcitein concretionary zones. fine calcareous 20 no
kk Challenge Creek 29N 13W 32 1.5 miles upstream from Challenge Cabin 48.23046825455 -113.325175728 TRS-SEC NAD83 180 flaggy (2-5 cm thick) yellow green, silty and agrillaceous medium 45 probably not