THE 
AMERICAN GEOLOGIST. 
A MONTHLY JOURNAL OF GEOLOGY 
AND 
ALLIED SCIENCES. 
EDITORS AND PROPRIETORS. 
Prof. Samuel Calvin, University of Iowa, Iowa City, Iowa. 
Dr. 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. Ulrich, Geol. Survey of Illinois, Newport, Ky. 
Dr. Alexander Winchell, University of Michigan, Ann Arbor, Mich. 
Prof. Newton H. Winchell, University of Minnesota, Minneapolis, Minn. 
VOLUME III. 
January to June, 1889. 
MINNEAPOLIS, MINN. 
1889. 
THE SWINBURNE PRINTING COMPANY. 
