Regional mapping at 1:125,000 scale appears to end at boundary of 

 Bob Marshall Wilderness and proposed additions, and does not 

 provide map coverage of the area. 



Bibliographic source: Geoindex lat-long search 



Author: Mudge, M.R. and R. L. Earhart 



Title: Bedrock geologic map of the northern Disturbed Belt, Lewis 

 and Clark, Teton, Pondera, Glacier, Flathead, Cascade and 

 Powell Counties, Montana 



Series: USGS Miscellaneous Investigations Series Map 1-1375 



Date: 1983 



Regional mapping at 1:125,000 scale provides generalized coverage 

 of sample area. Exposed units in the general area include the 

 Saint Mary Formation, the Two Medicine Formation, undifferentiated 

 Virgelle sandstone/Telegraph Creek Formation, and the Marias River 

 Shale, all Upper Cretaceous in age. Five thrust faults traverse 

 the general area, striking northwestward. The map scale is too 

 small to be sure which of the map units underlie the sample site - 

 possibly all of the above. The Bearpaw Shale is not mapped in the 

 immediate area. 



Lithologies described are dominantly fine-grained, with the 

 Virgelle sandstone and interbeds within the Two Medicine Formation 

 representing the most permeable-sounding lithologies, mudstones 

 predominating elsewhere. Shallow to moderate dips to the 

 southwest . 



This map includes no information on hydrology or surficial geology. 



Bibliographic source: Geoindex lat-long search 



Author: Stebinger, E. 



Title: Oil and gas geology of the Birch Creek - Sun River area, 

 northwestern Montana 



Series: USGS Bulletin 691-E 



Date: 1918 



Regional mapping at 1:125,000 scale includes the Jarina wetland 

 area at the northern extremity of the map area. Till shown 

 underlying most of the area, with the 'Horsethief Sandstone' 



35 



