THE 
AMERICAN GEOLOGIST 
A MONTHLY JOURNAL OF GEOLOGY 
AND 
ALLIED SCIENCES 
EDITORS AND PROPRIETORS: 
SAMUEL CaLvIn, Lowa City, Towa. 
Epwarp W. CiayPoun, Akron, Ohio. 
Francis W, Cracin, Colorado Springs, Colo. 
JOHN EYERMAN, Huston, Pu. ANDREW C. Lawson, Berkeley, Cal. 
PERSIFOR FRAZER, Philadelphi1, Pa. ROLLIN D. SALISBURY, Madison, Wis. 
Rosert T. Hii, Austin, Texas. JosePH B. TYRRELL, Ottawa, Ont. 
Epwarp O. Unricu, Newport, Ky. 
IsrAEL C. Wurtet, Morgantown, West Va. 
Newton H. WINcHELL, Minneapolis, Minn. 
VOLUME IX. 
- JANUARY’ TO JUNE, 1892. 
MINNEAPOLIS, MINN, 
"THE GEOLOGICAL PUBLISHING COMPANY. 
1892. 
i. KIMBALL PRINTING CO., PRINTERS. 
