TY - RPRT TI - Correlation chart of Frontier Formation from Greenhorn Range, southwestern Montana, to Mount Everts in Yellowstone National Park, Wyoming AU - R. G. Tysdal AU - T. S. Dyman AU - D. J. Nichols AU - W. A. Cobban PY - 1990 DO - 10.3133/mf2116 UR - https://pubs.usgs.gov/publication/mf2116 ID - mf2116 ER -