37 



along the road and at right angles to the strike, no ledges are exposed 

 where the road crosses the valley in which Mclnnis lake lies. This 

 valley is filled with modified drift. 



On the ridge north of this valley, however, where the West Bengal 

 road branches off, there is a breadth of 1,200 feet of nearly vertical 

 argillites of the Upper Etcheminian ; and north of these, in a swale, 

 800 feet of red and purplish-gray argillite, of the supposed additional 

 member at the top of the Etcheminian. Comparing this section with Traverse on 

 the one on the west branch of the Bengal road the following proper- ro ^j 

 tions appear : 



West Bengal Road. East Bengal Road. 

 Feet. Feet. 



Division 1 400 1,200 



2 900 .... 2,000 



3.. 1,100 .. . 1,200 



Upper red argillites 600 . . . . 800 



3,000 5,200 



Above the upper red slates a mass of fine dark gray (purplish-gray 

 weathering) clay slates is exposed for a width of 800 feet. As these 

 contain species of the Paradoxides fauna they are to be assigned to 

 the Acadian division of the St. John group. 



THICKNESS OF THE ETCHEMINIAN ON THE BOSTON ROAD. 



(See map on opposite page.) 



On this road the Cambrian rocks are mostly concealed by glacial 

 debris or by woodlands. Coming down off the ridge of Coldbrook 

 effusives in the Bengal settlement, at a point about two miles and a 

 half north-east of the preceding section, the presence of basal beds of 



the Etcheminian is recognizable in a red soil, full of fragments of 



Traverse of 

 purplish -red sandstone. Ihis soil continues to the stream draining Etcheminian 



the valley in which Mclnnis lake lies, and up the slope on the north on ^ 

 side of this valley. The space across this valley is about 2,000 feet. 



The ridge on the north side of the valley is covered by a gray (buff- 

 weathering) soil filled with stones and blocks of the gray argillites of 

 the Upper Etcheminian. This surface covering has a width on this 

 road of about 1,000 feet. After passing a wooded tract going towards 

 the Mira river, ths soil is found to be filled with fragments of the 

 gray flags and slates of the middle part of the St. John terrane. 



