418 



Dr» Dawson on the recent 



Newfoundland, it may be inferred to belong to the lower part of 

 the Lower Silurian system. The map attached to that paper and 

 here reproduced, shews the geographical position of the beds, 

 which extend along the whole Atlantic coast, from Cape Canso 

 to Cape Sable. 



Fig. 1. — Explanation of the Map and Section. 



(1) Secondary Trap. 



(2) New Red Sandstone (Permian or Triassic.) 



(3) Carboniferous. (In eastern part of Nora Scotia proper.) 



(4) Devonian. 



(5) Middle and Upper Silurian. 



(6) Metamorphosed Lower Silurian. (Auriferous region.) 



(7) Granite. 



The numbers refer to the section and to the corresponding shades of 



the map. 



In my "Acadian Geology," (1855) a more full description is 

 given of this " Atlantic Coast Metamorphic District," extending 

 £rom p. 346 to 365, and including some remarks on the proba- 

 bilities of the discovery of gold and other metals in this forma- 

 tion. From this description I may condense the following notice 

 of the rocks occurring in the district, and their distribution. 



The prevailing stratified rocks are clay slate and quartz rock, 

 the former of various degrees of coarseness, and usually of grey 

 and black tints, and the latter in thick massive beds of a grey 

 colour, locally named ** whin." In some localities these are re- 

 placed by mica slate and gneiss, perhaps consisting of the same 

 material in a farther state of metamorphism, and they are pene- 

 trated by veins and masses of intrusive granite, which from its 

 relations elsewhere, would seem to be of Devonian age. 



