Title: Mineral resources of the Scapegoat Wilderness, Powell and 

 Lewis and Clark Counties, Montana. 



Series: USGS Bulletin 1385-B 



Date: 1974 



The Indian Meadows RNA is just off the southern edge of the mapped 

 area. Contiguous areas are shown as undifferentiated glacial 

 materials or as "gravels" without specified origins. Map scale of 

 1:96,000. 



Upstream areas of this and adjacent drainages are mapped as 

 entirely Precambrian Belt formations, with extensive areas of 

 Helena Formation outcrop. 



Bibliographic source: Geoindex latlong search 



Author: Whipple, J.W. , M.R. Mudge and R.L. Earhart 



Title: Geologic map of the Rogers Pass area, Lewis and Clark 

 County, Montana. 



Series: U.S. Geological Survey Miscellaneous Investigations Series 

 Map 1-1642 



Date: 1987 



Excellent bedrock geologic map at 1:48000 scale shows outcrop on 

 the north side of Indian Meadows (Lone Mountain) as 01igocene(?) 

 /Miocene(?) sediments, described as dominantly clastic with minor 

 marlstone and limestone, locally carbonaceous and locally 

 tuffaceous. [Note that other references describe this unit as 

 pyritic in this area.] Outcrops to the south of the wetland area 

 are shown as tuff of the 01igocene(?) and Eocene Crater Mountain 

 Volcanics. Structurally, the area is shown near the eastern edge 

 of the Scapegoat thrust plate, with the (buried) Scapegoat thrust 

 trace inferred to pass 1-2 miles to the east. 



The Indian Meadows area proper is shown underlain by 

 undifferentiated glacial deposits. Note that the modern 

 contributing basin includes no mapped Belt or other Proterozoic 

 units. However, glacial or glaciof luvial transport from the North 

 Fork of Copper Creek undoubtedly contributed sediment derived from 

 large areas underlain by the Proterozoic Y Helena Formation 

 (dominantly calcareous and dolomitic) and the overlying Snowslip 

 Formation (dominantly siltite and argillite) , and probably from 

 areas underlain by Cambrian and Devonian sediments, dominantly 



33 



