-^1 
THE 
American QEOLoarst 
A MONTHLY JOURNAL OF GEOLOGY 
ALLIED SCIENCES. 
Editor: N. H, WINCHELL, Minneapolis, Minn. 
ASSOCIATE EDITORS: 
Florence Bascom, Bryn Mawr, Pa.. 
Charles E. Bhecher. New Haven, Conn. 
Samuel Calvin, Iowa City, Iowa. 
John M. Clarke, Albany, N. Y. Persifor Frazer, Philadelphia, Pa. 
Edwakd W. Claypole, Pasadena, Cal. Ulysses S. Grant, Evanston, 111. 
Herman L. P airchii^b, Rochester. N. Y. Georgb P. Merrill, PV'asfi2n^ton,D.C. 
Warren Upham, St. Paul, Minn. 
Isabel C. White, Morg-antown, W. Va. 
VOLUME XXVIIl 
July to December, 1901 
Minneapolis, Minn. 
H. W. Wilson 
1901 
The Univuksitv Press of Minnesota. 
A 
