<<
Age of the Bedford Shale, Berea Sandstone, and Simbury Shale in the Appalachian and Michigan Basins, Pennsylvania, Ohio, and Michigan
By WALLACE DE WITT, JR. CONTRIBUTIONS TO STRATIGRAPHY
GEOLOGICAL SURVEY BULLETIN 1294-G UNITED STATES DEPARTMENT OF THE INTERIOR
WALTER J. HICKEL, Secretary
GEOLOGICAL SURVEY
William T. Pecora, Director
U.S. GOVERNMENT PRINTING OFFICE WASHINGTON : 1970
For sale by the Superintendent of Documents, U.S. Government Printing Office Washington, D.C. 20402 - Price 10 cents (paper cover) CONTENTS