324 ROYAL SOCIETY OF CANADA 



(24) Nolan, A. W. and Dixon, J. D. — Greology of St. Helen's Island, Can. Rec. 



Sci.. Vol. 9, p. 53-6(5, 1903. 



This paper is a discussion of some of the results of a detailed 

 geological Survey of St. Helen's Island, Montreal, which was made 

 a part of the Honour Course in Geology at McGill University in 

 1901-1902. It principally describes the late Devonian breccia of the 

 island which is a result of the intrusion of the ancient volcano now 

 represented by the stock of Mount Royal. The breccia has a dolomitic 

 matrix, probably due to composition of a nepheline-bearing ash, and 

 contains fragments of earlier rocks. While it rests on Utica (Cambro- 

 Silurian) shale, some of the included rocks are Oriskany (lower Devon- 

 ian) in age. This is initerpreted to show that the greatar part of the 

 Devonian formation had been removed by denudation at the time of 

 the irruption of Mount Royal ; a conclusion that is corroborated by 

 the general absence of this formation from western Quebec. 



(25) O'SULLIVAN, Owen. — A summary description of the season's work. Only 



two rock exposures were found on the west coast of James Bay, they 

 were of fossiliferous Devonian limestone. Evidence is given to show 

 that the coast is slowly rising. 



(26) Poole, H. S. — The basal rocks of the Magdalen islands are of Carbonifer- 



ous limestone age, it is believed that, as shown by soundings, they oncQ 

 extended in a fold parallel to the present coast of Cape Breton and 

 near to Prince Edward Island. A second anticline, the Wallace anti- 

 cline, commences in carboniferous strata in Nova Scotia and is believed, 

 as shown by soundings, to extend further to the east, underneath the 

 water and parallel with the above submerged ridge. " Within the 

 shelteir of these ridges possibly were the condition alone favourable for 

 the accumulation of coal in seams of workable thickness. Prince Ed- 

 ward Island and the major part of the Gulf (of St. Lawrence) lie 

 outside the fold." 



(27) Sherzee. W. H. — ^The rejiort is a summary of the most important observa- 



tions made during the season of 1904, by the Smithsonian expedition, 

 upon five glaciers lying withiji fifty miles of one another. It contains 

 descriptions of the structures, rates of movements and various phenomena 

 connected with these glaciers. A parasitic glacier, on a tributary of 

 the Victoria glacier, moves across the «tributary and delivers its ground 

 moraine to the medial moraine of the main stream. The Wenkchemma 

 glacier is of the piedmont type and is composed of eight to ten ice 

 streams. Observations show that the ice granules of the glaciers tend 

 toi lie with their principal optic axes vertical. Three types of dust 

 bands are described. The first type is the original dust bands of 

 Forbes and their formation is explained. The second type is named 

 dust zones and is caused by the relatively larger proportion of foreign 

 material in one of two outcropping ice strata. The third type is named 

 dirt strips, it is entirely superficial and is due to the collection of dirt 

 in the( vesicular ice separating laminae on a surface subject to melting. 

 A double series of block moraines, comparatively free from finer material, 

 occurs in connection with four of the five glaciers examined, its absence 

 from the fifth is probably due to the form of the surrounding moun- 



