IOO 



The mass of Mount Ste. Anne is peculiarly isolated by 

 a series of fault scarps one of which fronts the sea at the 

 east; a second, the Grand Coupe, faces the north; and a 

 third, the Amphitheatre, lies behind the mountain facing 

 the southwest and separates the mountain mass from the 

 zone of Silurian limestones which almost encircles it. 



The throw of these faults is indicated by the fact that 

 the exposed beds of conglomerate seen in the coast ledges 

 south of the South Beach and thence on southward to 

 Cap Blanc are mostly of the middle and upper beds carrying 

 jasper pebbles with a few fossil-bearing limestone and slate 

 pebbles. These intimate a displacement of approximately 

 1,000 feet (300 m.). (See under Cap Blanc). 



Cap Blanc or Whitehead is the sea-end of the southern 

 rock ridge bounding the Perce triangle. It is a mass of 

 light grey Ordovician limestones, having the steep dip 

 (8o° SE.) of all Palaeozoic strata here lying beneath the 

 Bonaventure formation. In approaching the cape from 

 the north theb.- limestones are seen to rise gradually from 

 the sea, and are overlain by the slightly inclined basal beds 

 of the Bonaventure conglomerate. The entire series of 

 the lower beds is overturned, the Ordovician lying above the 

 Silurian. The first or northernmost of these are latest 

 in age and they alone in the series are tinted red and 

 greenish, but soon pass into grey. Probably some part 

 of the red stain in these beds has been derived from the 

 red Bonaventure over them. The overlapping beds soon 

 disappear leaving the erect strata standing alone and giving 

 name to Cap Blanc which is conspicuously white by 

 contrast to the red rocks about it. Just beyond the point 

 of the cape these grey limestones are cut off and terminated 

 by a sharp fault against the Bonaventure beds, the former 

 having moved down, as shown by the down-dragged edges 

 of the Bonaventure. Access to the cliff for purposes of 

 examining the rocks is difficult except at low tide in a 

 gentle sea. 



The lower and later red-greenish beds contain some 

 fossils in abundance: Favosites (cf. hisingeri), Holy sites 

 catenularius typicus, Lyellia, Callopora, Cladopora, Lichas, 

 Chonetes (type of noiascotica) , Catazyga or Zygospira: 

 enough to indicate a Silurian age, though most of the 

 species have not been determined. The grey beds farther 

 south are sparsely fossiliferous but carry an Ordovician 

 fauna as early as the Trenton and comparable to that of 



