Reconnaissance of geology and ground water in the lower Grand River valley, South Dakota, with a section on Chemical quality of the ground water

Abstract

__ 1 ________'_'__ I Introduction._____________________________________________________ Purpose and scope of the investigation.__________________________ Location and extent of the area.________________________________ Previous investigations.._______________________________________ Well-numbering system________________________________________ Geography__ _ __________________________________________________ Topography and drainage._____________________________________ Climate._____________________________________________________ 6 Population. __ _ ______________________________________________ 6 Transportation._______________________________________________ Agriculture, industry, and natural resources_____________________ Summary of geologic structure and stratigraphy _______________________ Geologic formations and their water-bearing properties _________________ Pierre shale___________________________________________________ Fox Hills sandstone_-__-___-_-_-___________-________-__ Hell Creek formation._________________________________________ Fort Union formation (Ludlow member)_______________________ Glacial deposits.______________________________________________ Terrace deposits.______________________________________________ 13 Alluvium _____________________________________________________ Ground water_____________________________________________________