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"* A 
THE 
AMERICAN GEOLOGIST 
A MONTHLY JOURNAL OF GEOLOGY 
AND 
ALLIED SCIENCES 
Editor: N. H. WINCHELL, Minneapolis, Minn. 
ASSOCIATE EDITORS: 
Florence Bascom, Bryn Ma-wr, Pa. 
Samuel Calvin, Iowa City, Iowa. 
John M. Clarke. Albany. N. V. 
Herman L. Fairchild, Rochester, N. Y. Persifor Frazer, Philadelphia, Pa. 
Ulysses S. Grant, Evanston, III. Oliver Perry Hay, New York, N. Y. 
George P. Merrill. Washington, D. C. Charles S. Prosser, Columbus, Chio. 
Warren Upham, St. Paul, Minn. 
Israel C. White, Morgantown. W. Va. 
Horace V. Winchf.ll, Butte, Montana. 
VOLUME XXXVI 
July to December, 1905 
Minneapolis, Minn. 
The Geological Publishing Co. 
1905 Q-y 
