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The Foerstia Zone of the Ohio and Chattanooga Shales
GEOLOGICAL SURVEY BULLETIN 1294 H
The Foerstia Zone of the Ohio and Chattanooga Shales By J. M. SCHOPF and J. F. SCHWIETERING CONTRIBUTIONS TO STRATIGRAPHY
GEOLOGICAL SURVEY BULLETIN 1294-H
An explanation for the strati graphic zonation of the fossils and a report on a newly discovered occurrence of the Foerstia zone in western Ohio
UNITED STATES GOVERNMENT PRINTING OFFICE, WASHINGTON : 1970 UNITED STATES DEPARTMENT OF THE INTERIOR WALTER J. HICKEL, Secretary
GEOLOGICAL SURVEY William T. Pecora, Director
Library of Congress catalog-card No. 73-607393
For sale by the Superintendent of Documents, U.S. Government Printing Office Washington, D.C. 20402 - Price 30 cents (paper cover) CONTENTS