shows regional outcrop distribution only, and does not include any 

 structural information or local lithologic descriptions. 



Bibliographic source: Montana Bureau of Mines and Geology 

 Publications Index. 



Author : Donovan , J.J. 



Title: Ground-water geology and high-yield aquifers of 

 northeastern Montana 



Series: MBMB Open-file report 209 



Date: 1988 



Aquifer mapping at 1:100,000 scale shows Comertown Preserve to be 

 well outside the distribution of high-yield gravel aquifers. 



Condon Creek Proposed RN A. #1 and #2. 



Bibliographic Source: Geoindex lat-long search. 



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



Title: Geologic Map of the Bob Marshall and Great Bear 

 Wildernesses and Adjacent Study Areas, Northwestern 

 Montana . 



Series: U.S. Geological Survey Miscellaneous Investigations Series 

 Map 1-2181 



Date: 1991 



Map coverage at 1:125,000 scale covers the Swan Range above the 

 site but not the lower slopes or lowland areas. Mapped formations 

 upgradient of the wetland site include the Spokane formation, the 

 Empire Formation and the Helena Formation (all Proterozoic Y in 

 age) with the Late Proterozoic diorite occurring near the Swan 

 divide. 



The Spokane Formation is described as dominantly thin-bedded 

 siltite with subordinate argillite and quartzite. The overlying 

 Empire Formation (transitional between Spokane and Helena) is 

 described as dominantly calcareous to dolomitic argillite, with 

 subordinate dolomite and quartzite interbeds. The Helena Formation 

 is described as mainly limestone, dolomite and calcitic dolomite. 



