474 ' Canadian Record of 8cience. 



4. " The Geology of Rigaud Mountain, Province of Quebec, 

 Canada," by Mr. Osmond Edgar LeEoy, Montreal, Can. 

 Introduced by Prof. F. D. Adams. 



" The chief topographic feature of the paleeozoic plain of 

 Central Canada is a series of hills which occur in the 

 district about Montreal. These are of igneous origin and 

 follow a line of disturbance which is almost at right angles 

 to the trend of the Notre Dame mountains. Eigaud is 

 the most western of the series. It consists of an area of 

 hornblende syenite, which is pierced on its northern flank 

 by a quartz syenite porphyry. The field relations of all 

 the hills with the exception of Rigaud shew them to be of 

 post-Silurian age. In the case of the latter the contact 

 with the Pakeozoic is wholly concealed by drift. The 

 object of the research was to ascertain if a genetic connec- 

 tion could be established between Rigaud and the other 

 hills to the east. Investigation shows that it is probably 

 not so connected, but a definite conclusion cannot be 

 reached until a more extended study is made of the rest of 

 the range." 



Profs. K S. Shaler, H. P. Cushing, F. D. Adams and Mr. 

 H. M. Ami took part in the discussion, in which both the 

 rock of the mountain itself and the Pleistocene deposits 

 were taken up. 



5. " The Knoydart FormatAon in Nova Scotia " — a hit of 

 " The Old Red Sandstone " of EiiroiJe," by Dr. H. M. Ami, 

 Ottawa, Can. 



"The presence of such genera as Pteraspis, Pterygotus, 

 Onchus, Psammosteus and Cephalaspis, in the red marls, 

 shales and volcanic ash-beds of McArras Brook in Anti- 

 gonish and Pictou Counties, Nova Scotia, indicate the 

 base of the " Old Red Sandstone " of Great Britain. The 

 paper dealt with the relations, palseontological and strati- 

 graphical of this important formation in the sequence of 

 Devonian strata in Eastern Canada. The result of obser- 

 vations made by Mr. Hugh Fletcher of the Canadian 



