Outlines of Geologic History with 

 Especial Reference to North America 



Symposium Organized by 



BAILEY WILLIS 



Compilation Edited by 



ROLLIN D. SALISBURY 



GEOLOGISTS and all readers of geologic 

 literature will welcome the publication, 

 in book form, of an important series of 

 essays and discussions on the subject of geologic 

 correlation under the title, Ouilines of Geologic 

 History with Especial Reference to North America. 

 They embody the present state of knowledge 

 and opinion concerning many of the funda- 

 mental problems of North American geology, 

 and form an admirable supplement to earlier 

 treatises and manuals. 



The value of the book is greatly enhanced 

 by the fifteen paleogeographic maps by Bailey 

 WiUis which accompany the papers. 



316 pages, Svo, cloth; price $1.50, postpaid $1.65 



The University of Chicago Press 



Chicago 



Illi 



Starved Rock State Park 

 and Its Environs 



By CARL O. SAUER 



Department oj Geology, University of Michigan 



GILBERT H. CADY 



Illinois Slate Geological Survey 



HENRY C. COWLES 



Professor of Ecology, University of Chicago 



This thorough and interesting geographical 

 study of the best-known feature of the Illi- 

 nois Valley has been prepared for the benefit 

 of those who are interested in knowing more 

 about the region than can be gathered by 

 personal observation in a few hours or a few 

 days spent in the park. The physical geog- 

 raphy of the park and its surroundings has 

 a number of features, such as the beautiful 

 little canyons, which are unusual in this part 

 of the country. Part I is given up to the 

 geography of the park, its surface features 

 and their origin, and the exploration, settle- 

 ment, and development of the region; Part 

 II, to the geology of the park; and Part III, 

 to its botan3^ 



130 pages, cloth, $2.00, postpaid $2.1 s 



THE UNIVERSITY OF CHICAGO PRESS 



CHICAGO - - - - ILLINOIS 



Source Book for the Economic Geography 

 of North America 



By CHARLES C. COLBY 



Assistant Professor of Geography, the University of Chicago 



The fundamental idea of the book is to make available to the busy teacher the 

 material on this subject which is scattered widely through literature. The course which 

 has been given for a number of years at the University of Chicago has resulted in the 

 collection and organization of the niaterial most suitable for the purpose. 



The book contains short magazine articles and materials from Canadian, Mexican, 

 and United States government publications. The selection of the material has been 

 governed by the concept that there is a durect relation between the environment and 

 the economic activities of the region. The author aims to survey the different sections 

 of the country from the viewpoint of industrial opportunity. 



Svo, cloth; 4ig pages, $4.00, postpaid $4.15 



THE UNIVERSITY OF CHICAGO PRESS 



CHICAGO ..... ILLINOIS 



