Geology of the Potosi
CO w Quadrangle, Grant County Wisconsin, and PQ Dubuque County, Iowa En
I GEOLOGICAL SURVEY BULLETIN 1123-1 Prepared in cooperation with the O O Wisconsin Geological and Natural History Survey
52;
PH ^ O o fc-3 o tGeology of the Potosi Quadrangle, Grant County Wisconsin, and Dubuque County, Iowa
By JESSE W. WHITLOW and WALTER S. WEST
GEOLOGY OF PARTS OF THE UPPER MISSISSIPPI VALLEY ZINC-LEAD DISTRICT
GEOLOGICAL SURVEY BULLETIN 1123-1
Prepared in cooperation with the Wisconsin Geological and Natural History Survey
UNITED STATES GOVERNMENT PRINTING OFFICE, WASHINGTON: 1966 UNITED STATES DEPARTMENT OF THE INTERIOR
STEWART L. UDALL, Secretary
GEOLOGICAL SURVEY
William T. Pecora, Director
Library of Congress catalog card No. 66-256
For sale by the Superintendent of Documents, U.S. Government Printing Office . Washington, D.C. 20402 CONTENTS