582 REVIEWS 



Ontario and the neighboring portions of Quebec. They object especially 

 to the statement that the Hastings series is in reality only a less altered 

 phase of the Grenville series. They have found that in eastern Ontario 

 many of the limestones, conglomerates, and other fragmental rocks, which 

 have been called the Hastings series, are much younger than the typical 

 limestones of the Grenville series proper, and overlie the latter uncon- 

 formably. The Grenville limestone, which rests in places on the ropy 

 surfaces of Keewatin lavas, may be correlated with the Keewatin Iron 

 Formation of the Lake Superior region; while the younger sedimentaries 

 of the Hastings series are probably Huronian in age. H. H. 



The Pre-Cambrian Volcanic and Intrusive Rocks of the Fox River 



Valley, Wisconsin. By William Herbert Hobbs and Charles 



Kenneth Leith. Bulletin of the University of Wisconsin, 



No. 158, pp. 247-78. 21 figs. Madison, May, 1907. 



The Fox River Valley area of south-central Wisconsin presents several 



well-defined exposures of crystalline rocks of quite uniform chemical and 



mineralogical composition, but of varying textures. In passing outward 



from the granitic centers, intermediate textures and then surface volcanics 



are encountered, indicating the truncation of a volcanic region. The age 



of these rocks is certainly pre-Cambrian and probably Archean; for they 



occur as monadnocks projecting above the pre-Cambrian peneplain. The 



various rock types which are found in the area are fully described in the 



report. H. H. 



Abandoned Shore Lines of Eastern Wisconsin. By James Walter 



Goldthwait. Wisconsin Geological and Natural History 



Survey, Bulletin No. XVII. 126 pp., 37 pis., 37 figs. Madison, 



1907. 



While the history of the greater Great Lakes which existed during the 



late stages of the Glacial period has been well blocked out by various 



investigators, detailed study of the ancient shore lines has been undertaken 



in only a few areas. This bulletin contains a very complete description 



of the old shore lines in Wisconsin, together with a review of all the previous 



work done in developing the history of the lakes, and a useful bibliography. 



Light is thrown on several controverted questions, and among the more 



important conclusions reached may be mentioned the following: 



The 60-foot and 40-foot beaches of Lake Chicago seem to extend as far north 

 as Sheboygan. It seems probable that the more northerly portions of them were 



