and proposed natural areas. 



Series: Project report on USDA Forest Service Intermountain 

 Research Station Proposal #89009. 



Date: 198? 



This document provides a partial chemical anaysis for Dudley Sluogh 

 from July 1988, a reported maximum depth of 6 meters, and 

 biological inventory data. 



Evans Lake 



Bibliographic source: None - personal collection 



Author : Dea , Peter 



Title: Glacial geology of the Ovando Valley, Powell County, 

 Montana 



Series: University of Montana M.S. thesis in geology 



Date: 1982 



Detailed surficial geologic mapping at approximately 1:40,000 scale 

 shows Evans Lake underlain by till of the late Pleistocene North 

 Fork advance. Evans Lake is approximately 1 mile from the western 

 limit of North Fork till as mapped by Dea. Dea's study focused on 

 the deposits of the Clearwater and Monture advances, and does not 

 attempt to interpret stratigraphic relationships between the North 

 Fork till and the outwash deposits contacting the till. [The 

 Copenhaver Park well log, if it exists, might clarify this 

 relationship.] It is possible that marginal Monture Creek and/or 

 North Fork outwash underlies Evans Lake at relatively shallow 

 depths . 



The Dry Gulch channel is not mapped separately from the North Fork 

 till. 



Bibliographic source: Geoindex lat-long search 



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



Title: Geologic and structure map of the Choteau 1 degree X 2 

 degree quadrangle. Western Montana. 



Series: U.S. Geological Survey Miscellaneous Investigations Series 



21 



