Pl'BI.Ii^HED MONTHLY. COMMENCED JANUARY, 1888 



The American Geologist. 



ILLUSTRATED. 



A Strictly Geological Journal- 

 Two Volumes of 400 Pages each, per year. 



SiibscnpiioJi, 



Sample Copies 20 cents. i'(^ 



Editors and Proprietors. 



Samuel Calvin, Iowa City, Iowa. 



Edward W. Claypole, AkrOn, Ohio. 



John Eyerman, Easton, Pa. 

 Persifor Frazer, Philadelphia, Pa. Charles E. Beecher, '. 



M. E. Wadsworth, Houghton, Mich. Warren Upham, Somerville, Mass. 

 John M. Clarke, Albany, N. Y. Edward O. Ulrich, Newport, Ky. 



I. C. White, Morgantown, W. Va. 



Francis W. Cragin, Colorado Springs, Col. 



Newton H. Winchell, Minneapolis, Minn. 



PUBLISHED AT MINNEAPOLIS. 



UNIVERSITY PRES5: 



Engravers and Printers. 



We make a specialty of process plate work 

 in Outline and Half-tones, for Scientific Illustra- 

 tions. Our work is done under the direct super- 

 vision of the Professors of the Scientific Depart- 

 ment of Denison University. Scientific men will 

 appreciate this advantage that our engravers are 

 familiar with the class of subjects treated. 



Prices of the various classes of work furnished 

 on application. Address 



UNIVERSITY PRKSS, - GRAKVILLK, O 



