i8o The Ottawa Naturalist. [January 



outcrops of the Calciferous limestone, and these at the latter 

 place pass upward into the basal beds of the Chazy, which here 

 consist of coarse greenish grits and fine conglomerates. The 

 Chazy strata thence extend along the south shore of the Ottawa 

 to the mouth of the Mississippi at Fitzroy Harbor, where they 

 again rest upon the Calciferous limestone. The Chazy lime- 

 stones are well seen in a part of this section, coming in on the 

 hill to the south of Berry's Wharf, and also along the shore 

 several miles west of this place, whence they extend to the west- 

 ern line of Torbolton. On the north side of the river the shales 

 arc exposed at the village of Quyon, resting upon the Cal- 

 ciferous which forms a narrow fringe along that part of the 

 river. Nearer the city the shales are visible at Aylmer and 

 along the north shore as far west as the cove near Breckenridge 

 station on the Pontiac and Pacific railway ; a small selvage of 

 the Calciferous limestone occupying the shoie below high-water 

 mark, in the upper part of this distance. East of Aylmer the 

 shales extend to a point about two miles east of Conroy's Mills 

 at Du Chene. They are also well seen along the line of the 

 Electric railway till they are overlapped by the Chazy limestones 

 west of Tetreauville. They do not appear along the north side 

 of the Ottawa below this point with the exception of a very 

 small outcrop along the road in Tetreauville near the fault be- 

 tween the Trenton and the Black River. 



East of the city the Chazy comes prominently into view a 

 short distance west of the Gatineau Ferry landing at Rocklifife 

 The contact between the Chazy shales and the Trenton limestones 

 is, indicated by a fault of considerable extent which is about ten 

 chains west of the ferry landing, the nodular limestones of the 

 Trenton there coming to the surface. Limestones, apparently 

 all of Trenton age thence occupy the shore to the western side 

 of the point below the upper ferry wharf, where they are in 

 contact, also by a fault, with the Trenton limestones of New 



