Warhorse L^e 



Bibliographic source: Geoindex lat-long search. 



Author: Perry, E.S. 



Title: Artesian wells as a source of water for the Winnett 

 Irrigation Project, Montana 



Series: MBMG Miscellaneous Contributions no. 1 



Date: 193 2 



This document has no plates, providing only a 1:126,720 (.5 

 inch/mile) line map with structure contours. The entire Warhorse 

 basin is shown as Colorado Shale, with younger Cretaceous units 

 outcropping far upgradient toward the Judith Mountains and 

 downgradient on lower Boxelder Creek. 



Perry discounts the importance of ground-water discharge to Fords 

 Creek on structural grounds (dips are away from the drainage). 

 Warhorse Lake itself occupies northwestward plunging synformal 

 structure (Reeves, 1927) with no formations above the Colorado 

 exposed, suggesting little likelihood of ground-water contribution. 



Perry notes ubiquitous presence of gypsum (selenite) in the 

 Colorado shale outcrops of the area. 



Perry also noted that Warhorse was dry during the summer of 1941. 



Bibliographic source: Geoindex lat-long search 



Author: Reeves, Frank 



Title: Geology of the Cat Creek and Devils Basin oil fields and 

 adjacent areas in Montana 



Series: USGS Bulletin 786-B 



Date: 1927 



See entry under Lake Mason also. 



Warhorse Lake is near the northwestern corner of the map area. All 

 of the catchment shown is underlain by Colorado Shale. Middle and 

 upper Ford's Creek (which is/was diverted into Warhorse) is not 

 mapped. Warhorse occupies a position near the axis of a minor 

 syncline between the Kootenai Dome to the north and the McDonald 



72 



