THE 
AMERICAN GEOLOGIST. 
A MONTHLY JOURNAL OF GEOLOGY 
AND 
ALLIED SCIENCES. 
EDITORS AND PROPRIETORS. 
Samuel Cabvin, Iowa City, Iowa. 
Edward W. Claypole, Akron, Ohio. 
John Eyerman, Easton, Pa. 
Persifor Frazer, Philadelphia, Pa. Arthur Lakes, Golden, Colo. 
Robert Hay, Jtinction City, Kansas. Andrew C. Lawson, Ottazva, Ont. 
Clarence L. Herrick, Cincinnati, O. Edward O. Ulrich, Newport, Ky. 
Israel C. White, Morgantown, IV. Va. 
Alexander Winchell, Ann Arbor, Mich. 
Newton H. Winchell, Minneapolis, Minn. 
VOLUME V. 
January to June 1890. 
MINNEAPOLIS, MINN. 
1890. 
THE SWINBURNE PRINTING COMPANY. 
