OF CENTRAL CANADA PART V. 335 



direction to the head of Lake Champlain, beyond the province boun- 

 dary. All the strata to the south and east of this fault have been 

 greatly disturbed and broken up, and have been more or less altered 

 by metamorphic agencies. Crystalline, gneissoid and magiiesian 

 rocks appear in part to underlie them, and partly to be mixed up 

 with them in intricate foldings, by which their stratigraphic relations 

 become greatly obscured. In many places also they are broken 

 through by trachytic and granitic masses. 



As regards its geology therefore, the Province admits of a sub- 

 division into three natural areas : the Archaean area of the north ; 

 the typical Palaeozoic area ; and the disturbed Appalachian district 

 including the Eastern Townships and the Gaspe' peninsula. For con- 

 venience of description, however, the Island of Anticosti and the 

 Mingan Islands may be separated from the second of the above 

 areas, and regarded as forming a distinct palaeozoic district. 



The positions of these areas are shewn roughly in the annexed 

 sketch-map : 



FIG. 246. 

 Sketch-Map of the Province of Quebec, shewing geological areas. 



1. Northern Archaean district shewn in part, only. 



2. Palaeozoic district of the Upper St. Lawrence. 



3. Palaeozoic district of Anticosti and the Gulf. 



4. Appalachian and Gasp^ district. 



Q Quebec ; M Montreal ; C Lake Champlain (Northern por- 

 tion). The dotted line indicates the direction of the great Fault. 



