Paleomagnetism of some Lake Superior Keweenawan rocks /
by Kenneth G. Books.
- Washington: United States Government Printing Office, 1972.
- iv, 42 p. : maps, tables ; 29 cm.
- 760 .
Includes bibliographical references (p. 40-42).
Remanent magnetization directions for lower and middle Keweenawan rocks fall into three groups that have their polarities alternately normal, reversed and normal.