“…In 1982 W. E. Hall and C. M. Tschanz completed compilation of existing geologic mapping for a 1,900 sq km area surrounding Ketchum, Idaho. Much of the data in this compilation resulted from work by Hall, Tschanz, andcoworkers carried out from 1970 to 1978 (Hall and others, 1978;Hall and Batchelder, 1979;Batchelder and Hall, 1978;W. E. Hall and C. M. Tschanz, unpub.…”