35 



(See map opposite.) Traverse on 



On the West Bengal road the contact of this terrane with the r0 ad. 

 effusive rocks of the Coldbrook is seen a short distance north of 

 A. McDonald's, where a heavy conglomerate with pebbles of quartz and 

 felsite crosses the road in vertical beds. For about half way to the 

 corner of this road and the Trout brook road at Johnson's, purplish- 

 red sandstone in blocks or ledges indicates the presence of the Lower 

 Etcheminian (Divisions 1 and 2). A quartzite ledge marks the passage 

 to the Upper Division. The thickness of the Lower Etcheminian 

 here is estimated at 1,300 feet. In the two-thirds of this there is 

 much hard purplish-gray feldspathic sandstone and slate, weathering 

 lavender gray. Upper 



For another half mile the road runs diagonally across a low ridge, Etcheminian. 

 where, from the soil exposed and the ledges and blocks visible, it may 

 be inferred that the upper division of the Etcheminian terrane is 

 present. From the known strike of the argillites visible here, it is 

 estimated that there are 1,100 feet in width of measures of the pale 

 gray argillites. There is also north of the road, at Johnson's, 600 

 feet in width of a swale filled with debris of purplish-red slates, which 

 appears to be of the same terrane. Such strata were not seen in the 

 Cambrian basins of East bay and St. Andrews channel to the north- 

 west. With this addition there are 1,700 feet of Upper Etcheminian 



rocks on this side of the Mira valley at West Bengal road. ,, . . 



J Thickness in 



A comparison will show, if the thickness has not been increased by 

 faults, how much thicker the Etcheminian is here than in the Indian 

 brook valley. 



Dugald Brook. Bengal Road. 



Feet. Feet. 



Division 1 120 400 



2... 150 .... 900 



3 230 .... 1,100 



Additional measures 600 



500 3,000 



THICKNESS ON THE EAST BRANCH OF THE BENGAL ROAD. 



Another traverse of the Etcheminian was made on the north part 

 of the Bengal road and its eastern branch leading to Bengal settlement. 

 Here to the east of Mclnnis lake, the soil and some ledger show a 

 width of 1,200 feet occupied by the measures of the lower division, or 

 for a distance along the road of 2,000 feet. For an equal distance 

 3 c. R. 



