TY - BOOK T1 - Depositional environments for strata of composite section of Frontier Formation, Madison Range, southwestern Montana / DA - 1991. CY - Washington, D.C. : CY - Denver, CO : AU - Tysdal, Russell G. VL - 1949 CN - QE75 CN - QE75 PB - U.S. G.P.O. ; PB - For sale by the U.S. Geological Survey, PP - Washington, D.C. : PP - Denver, CO : PY - 1991. ID - 229690 KW - Geology, Stratigraphic KW - Geology TI - Depositional environments for strata of composite section of Frontier Formation, Madison Range, southwestern Montana / ER -