THE 
AMERICAN GEOLOGIST 
A MONTHLY JOURNAL OF GEOLOGY 
ALLIED SCIENCES 
EDITORS AND PROPRIETORS 
Peof. Samuel Calvin, University otiowa, Iowa City, Iowa. 
Prop. Edward W. Claypole, Buchtel College, Akron, O. 
Dr. Persifor Frazer, Franklin Institute, Philadelphia, Penn. 
Dr. Lewis E. Hicks, University of Nebraska, Lincoln, Neb. 
Mr. Edward O. Uuiich, Geol. Survey of Illinois, Newport, Ky. 
Dr. Alexander Winchell, University of Michigan, Ann Arbor, Mich. 
Pbof. Newton H. Winchell, University of Minnesota, Minneapolis, Minn. 
VOLUME I 
January to June, 1888 
MINNEAPOLIS, MINN. 
1888 
printed by the university press, state university 
