6 SIDNEY POWERS 



who mapped the Minas Basin region 1 for the Geological Survey 

 of Canada. 



The former extent of the Acadian area is indeterminate, but 

 it is probable that it extended several miles in all directions beyond 

 the present boundaries. The original form appears to have been a 

 basin with its northern limit near the Cobequid Mountains and its 

 southern limit not far south of Grand Manan and Brier Island. 

 There may have been a ridge of older rock extending out into the 

 basin where the eastern side of Grand Manan now is, provided that 

 the interpretation of the geology of that island, as given below, is 

 correct. 



The Newark group in the Acadian area has been divided into 

 the following formation: 



Thickness in Feet 



Top, an erosion surface 



Scots Bay formation (calcareous white sandstone) 25-(2,ooo?) 



North Mountain basalt (a succession of lava flows) 800- 1 ,000 



Annapolis formation (red beds, largely calcareous) 



J Blomidan shale 500- 1,000 



\ Wolfville sandstone 2,000- 2,500 



3,325- 6,500 

 Base, an unconformity with Paleozoic or older rocks 



Interbedded in the Annapolis formation, near its top, are certain 

 basalt flows: agglomerate and tuff beds near the Five Islands, 

 grouped under the name Five Islands volcanics. At Quaco, 

 New Brunswick, there is a conglomerate horizon in the center of 

 the red sandstones correlated with the Annapolis formation, and 

 this conglomerate is called the Quaco conglomerate. 



DESCRIPTIVE GEOLOGY 



The descriptive geology of the Acadian Triassic will be taken 

 up by localities, giving a brief description of the lithological and 

 structural details. A number of detailed maps and sections are 

 introduced, which may be connected with the region as a whole, by 

 reference to the general map (Fig. 3), and the columnar sections 



1 H. Fletcher, various papers which have been printed in the annual and summary 

 reports of the Geological Survey of Canada from 1887 to 1907. See especially the 

 Annual Report, V (1892), Part P. 



