, A Pleistocene Ice Sheet in the .' Northern Boulder Mountains .< Jefferson, Powell, and Lewis and Clark Counties, Montana
By EDWARD T. RUPPEL
CONTRIBUTIONS TO GENERAL GEOLOGY
GEOLOGICAL SURVEY BULLETIN 1141-G
A descriptive report of the glacial geology in the northern part of the Boulder Mountains, Montana
UNITED STATES GOVERNMENT PRINTING OFFICE, WASHINGTON : 1962 UNITED STATES DEPARTMENT OF THE INTERIOR
STEWART L. UDALL, Secretary
GEOLOGICAL SURVEY
Thomas B. Nolan, Director
For sale by the Superintendent of Documents, U.S. Government Printing Office Washington 25, D.C. CONTENTS