REVIEWS 419 



Detailed Report on Nicholas County. By David B. Reger. West 



Virginia Geological Survey, No. 31. 192 1. 847 pages +xx 



pages of introductory matter; illustrated with 34 half-tone 



plates and 22 zinc etchings in the text, accompanied by a 



separate case of topographic and geologic maps. 



Nicholas County contains the New River Coal Group, as also the 



Kanawha Group and the lower members of the Allegheny Series in its 



northern portion. This report contains a chapter on the "Paleontology 



of Nicholas County" and a short description of the chert deposits of 



West Virginia by Dr. W. Armstrong Price. Price, including case of 



maps, delivery charges paid by the Survey, $3.00. Extra copies of 



topographic map, 75 cents; of the geologic map, $1.00. Remittances 



to West Virginia Geological Survey, Box 848, Morgantown, West 



Virginia. 



Geology and Mineral Deposits of a Part of Amherst Township, 



Quebec. By M. E. Wilson. Memoir 113, Canadian Geologi- 

 cal Survey, Ottawa, 1919. Pp. 54, figs. 3, pis. VII, maps 2. 



This district is thirty miles north of the Ottawa River and almost 

 equidistant from Montreal and Ottawa, and lies within the dissected 

 southern border of the Laurentian Plateau. The presence of extensive 

 deposits of kaolin near the southern part of Amherst Township is of 

 considerable geological interest, because kaolin is commonly thought 

 to be the product of surface-weathering and in Canada, for the most 

 part, the deposits formed by surface-weathering have been removed by 

 Pleistocene continental glaciation. 



The oldest rocks of this region belong to the Grenville sedimentary 

 series and consist of quartzite, garnet gneiss, and crystalline limestone. 

 These sediments are intruded by the Buckingham series of basic igneous 

 rocks (gabbro, pyroxene diorite, and pyroxene syenite). Both the fore- 

 going series are intruded by batholithic masses of granite-syenite gneiss. 

 Glacial drift and marine Champlain clay partially fill the depressions 

 between the rock ridges. 



The kaoUn and graphite deposits of the district are described in 

 detail. The kaolin occurs in an extensive zone of fracturing and faulting 

 in the Grenville quartzite and garnet gneiss and has been brought in by 

 solutions from either above or below and deposited along open fracture 

 planes or by the replacement of the quartzite wall rock. Crystals of 

 tourmaline, a mineral formed at high temperatures, in the kaolin and 

 the nearby outcrops of granite-gneiss suggest a deep-seated origin for 



