9/ 
THE 
American Geologist 
A MONTHLY JOURNAL OF GEOLOGY 
ALLIED SCIENCES 
EDITORS AND PROPRIETORS 
Florence Bascom, Bryn Mawr, Fa. 
Charles E. Beecher, New Haven, Conn. 
Samuel Calvin, Iowa City, Iowa. 
John M. Clarke, Albany, N. Y. Perstfor Frazer, FlUkuMphin. Pa. 
Edward W. Claypole, Akron, Ohio. Ulysses S. Grant, MinneniHilis. Minn. 
John Eyerman, aaston. Pa. Warren Upham, St. Paul, Minn. 
Marshman E. Wadsworth, Houghton, Mich. 
Israel C. White, Morgantoivn, W. Va. 
Newton H. W^inchell, Minneapolis, Minn. 
VOLUME XX 
July to December, 1897 
Minneapolis, Minn. 
The Geological Publishing Company 
1897 
The Franklin Printino Co., Printor.-^ 
