TY - RPRT TI - Stratigraphic sections, depositional environments, and metal content of the upper part of the Middle Pennsylvanian Minturn Formation, Northern Sangre De Cristo Range, Custer and Saguache counties, Colorado AU - R. F. Clark AU - D.M. Walz PY - 1985 DO - 10.3133/mf1622d UR - https://pubs.usgs.gov/publication/mf1622D ID - mf1622D ER -