1898] Ells— Formations, etc., of Ottawa Dlstrict. 179 



western part of March, and in that part of Nepean adjoining, the 

 same succession of the Potcdam and Calciferous can be observed ; 

 but here there is an upward passage into the Chazy and thence 

 into the overlying formations. The greenish-grey shales of the 

 Chazy can be seen all about the village of Britannia, from which 

 place they extend eastward along the shore of the Ottawa to the 

 vicinity of the old burned mill at Skead's. Along the Rideau 

 River, at Black Rapids and thence south to Smith's "Falls, the 

 Calciferous limestone is the prevailing rock, and this occupies a 

 great portion of the townships of Osgoode and Nepean. 



The Chazy does not appear in the city itself, west of the 

 park at Rockliffe ; but to the west of Hintonburg, going along 

 the south shore of the river, the limestones of the formation come 

 into view from beneath the Black River, about half a mile west 

 of the Little Chaudiere rapids, in rear of Mechanicsville. The 

 Chazy shales first appear at the cove above the old Skead mill^ 

 and thence they extend westward, as already noted, to 

 Britannia and for some distance beyond to the contact with the 

 underlying Calciferous. They are well exposed on the road to 

 Bell's Corners, near the crossing of the Ottawa and Parry Sound 

 railway, where they also rest upon the Calciferous in regular 

 order. Characteristic Chazy shales with bands of limestone are also 

 seen at the Hog's Back on the Rideau, but the outcrop, although 

 conspicuous at this place, is limited, and a fault to the south, 

 along the shore, brings in the Black River and Trenton, and cuts 

 out the upper or limestone portion ot the Chazy proper. About 

 a mile above the Hog's Back, Chazy strata again appear on the 

 east bank of the Rideau, but a short distance further south these 

 are in contact with the Calciferous by a fault which is conspicu- 

 ous along the road up the east side of the canal, where the strata 

 are tilted at a high angle 



The portion of the Ottawa from a point a couple of miles 

 above Britannia to about one mile east of Berry's Wharf, shows 



