against the crystalline horst behind it (north), the palae- 

 ozoics have been shoved and overthrust, here as elsewhere 

 throughout the 2,000 miles (3,600 km.) extent of the 

 Appalachians, to the southwest, but here with the sharp 

 crescentic curvature not elsewhere shown. The Island 

 of Anticosti, which lies 60 miles (108 km.) east-northeast 

 of Cape Gaspe, is an area of horizontal Silurian rocks out- 

 side the region of folding, — a parma lying between the 

 horst and the Appalachian folds. 



FOLDS. 



From the St. Lawrence river shore southward to Perce 

 the folds of the strata are exposed and certain fairly 

 definite anticlinal courses across them were determined 

 by Logan and in large measure confirmed by later observ- 

 ers. These are apparently five in number, beginning at 

 the north: 



1 . Forillon anticline (overthrust) ; 



2. Haldimand anticline; the axis runs through Gaspe 

 mountain (Gaspe basin) and enters the bay at Cape Haldi- 

 mand. In the trough between folds 1 and 2 lie the 

 upper reaches of Gaspe bay and the lower course of the 

 Dartmouth river or Nor'west arm. 



3. Tar Point anticline; strikes the bay at Tar point on 

 the south shore of Gaspe bay. Between it and fold 2 lies 

 the barachois at Douglastown and the lower course of the 

 St. John river which flows into it. 



4. St. Peter anticline, meeting the sea at Point St. 

 Peter. 



5. Perce anticline. This is by far the steepest and most 

 extensive of all the folds and is badly broken down at its 

 sea end. Between it and fold 4 lies Mai Bay, its barachois 

 and river. South of Perce the folds have been obscured 

 by the mantle of the overlying Bonaventure formation 

 (Devono-Carboniferous) which is feebly folded at the north 

 end but this folding is of a much later date than the funda- 

 mental folds. This covering of red rock is spread over the 

 south and southeastern parts of the peninsula and lies 

 everywhere on the almost vertical edges of the great 

 series of Ordovician-Silurian (mostly the latter) light 

 gray and blue limestones. 



