Toolev raka TcK>l e^ Lake 



Bibliographic source: Geoindex lat-long search 



Author: Coffin, D.L., A. Brietkrietz and R.G. McMurtrey 



Title: Surficial geology and water resources of the Tobacco and 

 Upper Stillwater River Valleys, Northwestern Montana 



Series: Montana Bureau of Mines and Geology Bulletin 81 



Date: 1971 



Surficial geologic mapping at approximately 1:100,000 scale 

 shows Tooley Lake underlain by glaciolacustrine sediments of 

 Glacial Lake Kootenai (?). Nearby exposures of glaciolacustrine 

 sediments are up to 300 feet in thickness. Glaciolacustrine 

 sediments in the study area are described as predominantly silt and 

 very fine sand with thin (less than 1 foot) clay interbeds. Spring 

 discharges from these sediments are described, but well completions 

 are reportedly rare and avoided by drillers due to heaving 

 tendencies. 



Upslope areas amounting to approximately half of the 

 contributing drainage are underlain by drumlin - marked till, 

 described in near-outcrop areas (as this is) as being boulder-rich 

 [although the drumlins imply it is still predominantly fine - 

 grained. ] 



Specific conductance measurements collected in June and 

 October of 1968 were 670 and 800 microsiemens, respectively. No 

 quantitative water chemistry from the lake or from wells in the 

 immediate vicinity are provided. 



Analog steady-state ground water flow model ( ! ! ) , with head 

 apparently tied to Tooley Lake, produced steep potentiometric 

 gradient between the lake and the Kootenai River. 



Bibliographic source: Geoindex lat-long search 



Author : Johns , W . M . 



Title: Geology and mineral deposits of Lincoln and Flathead 

 Counties, Montana 



Series: Montana Bureau of Mines and Geology Bulletin 79 



Date: 1970 



Relatively detailed pre-Cenozoic geologic mapping shows slopes to 

 the west underlain by undifferentiated Ravalli Group rocks of 

 Proterozoic Y (Belt) age. Ravalli Group rocks are described as 



65 



