358 The American Geologist. June, 1895 
The relations of this assemblage of rocks with those of group 
3 have not been clearly ascertained and he suggests that the 
two groups may be connected by gradual transition M'ithout 
non-conformity, and especially as the great development of 
volcanics seems at one place to be near the base of group 2, 
and at another to be at or near the summit of group 3. He 
states that they must be intimately related. His group 3 is 
thus described in general terms. 
The rocks composiiiir it are chiefly slaty aiul schistose and embrace 
various chioritic, micaceous, siliceous and magnesian strata with cop- 
per ores, also imperfect gneisses, white and grey crystalline micaceous 
dolomites and magnesian limestones. They constitute the main 
anticlinal axis of the region, which axis may be traced from Sutton 
mountain, east of lake Memphremagog, on a gently curving line north- 
eastward to the counties of Montmagny and L'llet — a distance of 150 
miles. 
The copper and copper ores of the region he considers to 
be divisible into two classes, under conditions almost if not 
quite as distinct as they are in the Lake Superior region. One 
class belongs to the crystalline schist group, and occurs in 
veins and lodes coincident with the stratification, generally 
ores, and the second class occurs in intimate association with 
eruptives, such as amygdaloids and eruptive agglomerates. 
He finally concludes : 
There seem to be no good grounds for assigning either an age or an 
origin to the cupriferous diorites, dolerites and amygdaloids of the 
eastern townships different from that of the almost identical rocks of 
lake Superior. 
The Hastings series he briefly alludes to, showing its paral- 
lelism with the lower portion of the Grenville series. Indeed 
the Hastings series bears many characters, not alone in its 
structural relations with the Grenville, but in its composition, 
that make it comparable with the schists of the "group 3" at 
Sutton mountain, while the Grenville series, in its strati- 
graphic sequence and its mineral composition, may as easily 
be compared with group 2. They both belong to the upper 
Laurentian, one being apparently the modified sediments of a 
great series of fragmentals and the other a later mass of 
crystalline eruptives carrying metamorphosed and isolated 
parts of the fragmental series. 
Since the work of Selwyn probably that of Ells is the most 
