REVIEWS 55 



Reginald A. Daly. "Variolitic Pillow-Lava from Newfoundland." Ameri- 



cati Geologist, Vol. XXXII (1903), pp. 65-78. 



Daly described variolitic pillow-lava from Newfoundland, and calls attention to 

 the widespread occurrence of this or similar rocks, frequently called ellipsoidal green- 

 stones, in Minnesota, New Brunswick, California, and Michigan. 



R. W. Ells. "The Progress of Geological Investigation in Nova Scotia." 

 Proceedings and Transactions of the Nova Scotian histitute of Science, 

 Vol. X, Part 4 (1901-1902), pp. 433-46. 

 Ells summarizes the progress of geological investigation in Nova Scotia. 



L. C. Graton. "On the Petrographical Relations of the Laurentian Lime- 

 stones and the Granite in the Township of Glamorgan, Haliburton County, 

 Ontario." Canadiatt Record of Science, Vol. IX (1903), pp. 1-38. 



Graton describes in detail the petrographical relations of the Grenville limestones 

 and granite in the township of Glamorgan, Haliburton county, Ontario. His conclu- 

 sions are of importance as bearing on the relations of limestones and gneisses over other 

 extensive areas in eastern Canada, the Adirondacks, and New Jersey. He summari- 

 zes his conclusions as follows : 



The district exhibits a development of Grenville limestone pierced by intrusions 

 of gneissic granite which contain masses of dioritic rock. 



Considerable deformation took place during the intrusion. 



Between the limestone and the granite is a highly brecciated zone, holding large 

 amounts of lime-rich silicates which are eminently characteristic of contact metamor- 

 phism. 



Diagenesis took place. 



To a great extent, however, the elements, other than the lime necessary for the 

 formation of these minerals, came from the intrusion and its accompanying exhala- 

 tions. 



The metamorphism, then, was largely also metasomatic. 



In the gray gneisses and in the granite are dark basic masses which represent 

 fragments broken off from the limestone series and floated away into the igneous 

 mass. They have been still more highly metamorphosed than the rocks from which 

 they came, and have been more or less dissolved and changed in character by the 

 granite. In other words, they have been partially "granitized." 



The gray gneisses, which have the composition of quartz diorites, may represent 

 an intermediate phase of this "granitization" — between the inclusions and the granite. 

 This theory'may account for the large amount of plagioclase feldspar found in the gran- 

 ite itself. 



R. W. Ells. " Report on the Geology of Argenteuil, Ottawa and Part of Pon- 

 tiac Counties, Province of Quebec, and Portions of Carleton, Russell and 

 Prescott Counties, Province of Ontario." Annual Report of Geological 

 Survey of Caiiada, Vol. XII (1899), New Series, pp, IJ-138J. 

 Ells maps and describes the geology of Argenteuil, Ottawa, and part of Pontiac 

 counties, province of Quebec, and portions of Carleton, Russell, and Prescott counties, 

 province of Ontario, covering most of what has long been known as the Original Lau- 

 rentian district, and summarizes previous work in this district. Archaean rocks. 



