﻿488 Canadian Record of Science. 



slates and sandstones (now regarded as Sillery), which 

 are developed in portions of the Eastern Townships in 

 association with Trenton limestones, are the equivalents of 

 certain dolomitic bands, as well as of the chloritic and 

 quartzose rocks of the Green Mountain range ; and that 

 the whole of these Green Mountain rocks, including the 

 auriferous quartz veins, belong to the Hudson River 

 group, with the possible addition of the Shawangunk 

 conglomerates. As for their extension, it is also said that 

 these Hudson River strata have a continuous run from 

 Lake Champlain along the south bank of the St. Lawrence 

 to Cape Rozier. 



This view as to the Hudson River age of these deposits 

 along the east side of the river was maintained for some 

 years ; and as regards the various widely different rocks 

 which make up the crystalline series of the mountain 

 range in their extension through the province of Quebec, 

 it was held that these represented the same series of 

 strata, the marked difference in their appearance and 

 composition being entirely due to metamorphism, so that 

 shales became slates and sandstones were altered into 

 quartzites and talcose strata, while the red slates and 

 green sandstones became converted into chloritic, epidotic 

 and ferriferous slates and less schistose forms of rock. 

 The whole were held to belong to the Lower Silurian 

 series of deposits, followed upward by others which were 

 of Upper Silurian age and contained fossils of that 

 division. 



The red and green slates seen along the north side of 

 the St. Lawrence above Quebec city were also supposed 

 to represent the Oneida division of the New York series, 

 and to rest upon the supposed Trenton rocks of the city 

 and of the Ste. Foye road. 



In 1855 Hunt, in discussing the structure and age of 

 these rocks, claimed that the red and green slates and 

 sandstones of the Sillery division, which had been so 



