39 



the kind of rocks which Mr. Fletcher says occur there. This stream is 

 McDougald brook, (Kelvin Brook of the Geological Survey map). The 

 rocks on this stream are described in the Report of Progress 1877-V8 



page 15 F. The large area of Etcheminian at the source of the Mira Source of the 



., , . . Etcheminian 



river and along the eastern side of its basin, as well as the great sediments. 



thickness they attain in this district, would indicate that they are 

 near the main source of supply of sedimentary matter available for 

 the building up of a geological terrane at that epoch. This source is 

 to be looked for in the extensive deposits of Coldbrook effusives and 

 to ancient erosion of the pre-Cambrian crystalline rocks that inter- 

 vene between the Mira valley and the Atlantic ocean. 



ST. JOHX TERRANE. 



Acadian Division. 



The disturbed and complicated structure of the Cambrian terranes Slates of the 

 in the north-eastern end of the Barachois basin makes it difficult to division in the 

 recognize the Acadian division here by its lithological features, and no Barochois 

 fossils characteristic of the division have been found. There are, 

 however, two places where fine, dark gray slates occur. One is on 

 the road from George river station to the Barachois ; another is on 

 the Intercolonial railway, south-west of Young's farm. At the first 

 locality there are dark gray silicious slates a short distance from 

 George river station. They lie between the road and the syenite hill 

 to the east and dip N. 50 W. mag. < 45. They are overlain in the 

 valley of Young brook by flags and slates of the Johannian division. 

 The other exposure of the slates of the Acadian division is along the 

 track of the railway as mentioned above, some distance south of 

 Young's house, at the foot of a slope of Etcheminian slates. This 

 band of Acadian slates runs diagonally up the hillside and crosses the 

 highway from George river station to Barachois. The rocks of this 

 division in the Indian brook valley are described in connection with 

 the next division of the St. John group. 



On the east side of the Mira valley the Acadian division forms an Acadian 

 important part of the St. John terrane, and contains characteristic 



fossils. The rt>ck there is a dark gray (purplish-gray weathering) clay- river, and 

 slate, showing on the Bengal road. It contains lentil es or irregular 

 layers of carbonate of lime, in one of which a Paradoxides, resembling 

 P. rugulosus, a Ptychoparia, and a Palseacmsea (or Parmophorella) 

 were found. A considerable thickness of these measures also exists 

 on the west side of the Mira valley as seen at McLean brook near 



