Lake Superior Region, United States
Correlation of Precambrian Rocks of the Lake Superior Region, United States U.S. GEOLOGICAL SURVEY PROFESSIONAL PAPER 1241-F Correlation of Precambrian Rocks of the Lake Superior Region, United States By G.B. MOREY and W.R. VAN SCHMUS CORRELATION OF PRECAMBRIAN ROCKS OF THE UNITED STATES AND MEXICO Edited by JACK E. HARRISON and ZELL E. PETERMAN U.S. GEOLOGICAL SURVEY PROFESSIONAL PAPER 1241-F Lithology, distribution, correlation, and isotope ages of exposed Precambrian rocks in the Lake Superior region of the north-central United States UNITED STATES GOVERNMENT PRINTING OFFICE, WASHINGTON 1988 DEPARTMENT OF THE INTERIOR DONALD PAUL HODEL, Secretary U.S. GEOLOGICAL SURVEY Dallas L. Peck, Director Library of Congress Cataloging-in-Publication Data Morey, G.B. Correlation of Precambrian rocks of the Lake Superior region, United States. (Correlation of Precambrian rocks of the United States and Mexico) (U.S. Geological Survey professional paper; 1241-F) Bibliography: p. Supt. of Docs. no.: I 19.16:1241-F 1. Geology, Stratigraphic-Pre-Cambrian. 2. Stratigraphic correlation-Superior, Lake, Region. I. Van Schmus, W.R. II. Title. III. Series. IV. Series: Geological Survey professional paper; 1241-F. QE653.M67 1988 551.7'1 '097749 87-600313 For sale by the Books and Open-File Reports Section, U.S. Geological Survey, Federal Center, Box 25425, Denver, CO 80225 Any use of trade names is for descriptive purposes only and does not imply endorsement by the U.S. Geological Survey CONTENTS Page Abstract . F1 Introduction . 1 Geologic and chronometric relations .............. : . 1 Archean rocks . 2 Gneiss terrane . 2 Stratigraphy and geochronology . 4 Greenstone-granite terrane .
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