478 REVIEWS 



The book is divided into two parts : Part I describes the topography, 

 and Part II gives the history of it development. 



The quartzite ridges are the most prominent geographic features. 

 In several places they rise to a height of 800 feet above the Wisconsin 

 River and extend for over twenty miles in a general east-west direction. 

 In no place is the quartzite found in horizontal beds, the dip vary- 

 ing between 15 and 90 degrees. Upon and against the quartzite are 

 horizontal beds of sandstone which have been deformed but little; the 

 sandstone topography, modified by the drift, forms the second great 

 geographic feature of the region. It is found north and south of the 

 quartzite ranges, and between them along the valley of the Baraboo. 



The first chapter in Part II gives an outline of the history of the 

 formations which outcrop about Baraboo. It is shown how the quartz- 

 ite was changed from loose sand to quartzite and how deformation 

 and metamorphism were developed during the uplift. The question 

 as to the amount of erosion before the deposition of Cambrian sedi- 

 ments is discussed, but no definite figures can be given. The same is 

 true as to the thickness of the quartzite. After the quartzite had been 

 eroded for a long interval of time, geographic changes caused the sea 

 *to again cover the region and the Paleozoic strata were laid down 

 unconformably on the eroded and folded quartzite. 



Some time in the Paleozoic, perhaps at the close of the Niagara, 

 the region was again uncovered by the sea, and the work of erosion was 

 begun anew upon the sediments which now completely covered the 

 quartzite bluffs. 



In chapter in is given a concise treatment of rain and river erosion, 

 adapted to the area in hand. The question of base-leveling is also 

 discussed. Chapter iv is given over to the description of striking 

 scenic features about Baraboo such as Devil's Lake, the Narrows, 

 Parfrey's and Dorward's Glens, the Dalles of the Wisconsin, Natural 

 Bridge and Castle Rock. 



Chapter v deals with the glacial period and is the longest and 

 most important in the book. The first part of the chapter is devoted 

 to a discussion of ice, ice action, and the general results of an ice 

 invasion. As far as possible the illustrations are taken from the region 

 of Baraboo. 



The last part of the chapter deals with the changes in drainage 

 effected by the ice. At the time the ice was on, much of the country 

 to the west was covered by large lakes. As the ice retreated these lakes 



