No mappable surficial deposits are shown in the Schrainineck Lake 

 basin. There is a large area of dune sand shown several miles to 

 the north, marginal to the Missouri River floodplain. 



The text includes a very interesting description of springs 

 discharging from the Bootlegger member. These are described as 

 numerous in the area, but of low yield and poor quality, typically 

 with salt efflorescences. Geyser Creek just north of Schrammeck 

 Lake is named for groundwater discharge features in bentonitic 

 Bootlegger Formation, forming holes and depositional cones. 



The few water quality analyses provided do not include any from the 

 Bootlegger Member. There is one analysis from a well in the Flood 

 Member (basal sandstone) of the Blackleaf. It has subequal 

 concentrations of divalent and monovalent cations, nearly equal 

 bicarbonate and sulfate concentrations, and TDS of 1078 mg/1. 



Spidel WPA 



Bibliographic source: Geoindex lat-long search 



Author: Ellis, M.S. 



Title: Geologic map of the Powder River basin and surrounding 

 areas. . . 



Series: USGS Miscellaneous Field Studies Map MF-2095 



Date: 1989 



Regional mapping at a scale of 1:500,000. See other entries under 

 this title. 



Bibliographic source: Geoindex lat-long search 



Author: Ellis, A.J. and O.E. Meinzer 



Title: Ground water in Musselshell and Golden Valley Counties, 

 Montana 



Series: USGS Water-supply paper 518 



Date: 1924 



Regional mapping at a scale of 1:250,000 includes the sample site 

 at southern extremity of map coverage. Structural interpretation 



60 



