Preliminary Surficial Geologic Map of the Newcastle 30' x 60' Quadrangle, Weston and Niobrara Counties, Wyoming, and Western South Dakota (2000)

Hallberg, L.L., and Case, J.C., 2000, Preliminary digital surficial geologic map of the Newcastle 30' x 60' quadrangle, Weston and Niobrara counties, Wyoming, and western South Dakota: Wyoming State Geological Survey Hazards Section Digital Map 00-5, scale 1:100,000.