"Dalhousie Silurian. "The rocks of this system occupy an extensive belt reaching across the entire breadth of the Province, from the State of Maine to the Bay Chaleur." In the east they rest upon Cambro- Silurian, A gentle inclined basin about 100 miles in breadth. Along the lower Restigouche river they are broken through by dykes of diorite and felsite in extensive masses. From Dalhousie to Ed River but no less than five distinct ridges of trap can be seen. The depressions are occupied by wedge-shaped areas of Silurian rocks which are highly fossiliferous"