152 
other fossils. In the cliffs by the water edge below this, 
a good opportunity is offered of seeing the shale and sand- 
stone which make up the greater part of the Aylmer 
formation. Some of the sandstone beds are lenticular. 
Fossils are not abundant at this point, but burrows such 
as Rusophycus grenvillensis, and trails of various kinds are 
not uncommon. 
An excellent section of the rocks, of which these cliffs 
are made up, is obtained on the road leading from the ferry 
to the electric railway, and in some of the beds of sandstone 
at the turn in the road it is possible to find a few brachio- 
pods, chiefly Camarotechia orientalis. Across the road 
from the station on the electric line is a low bluff, and in 
the green shale at the base of the bluff, specimens of Lingula 
bellt are quite common. 
The Aylmer sandstone, which is that occurring on the 
road to the ferry, is again well exposed in the quarry at 
the eastern end of the park. Fossils, however, are very rare 
here. 
On Buena Vista road, and in other high-lying parts of 
Rockcliffe, the Aylmer is capped by the lower layers of 
the Pamelia. The Pamelia is not ordinarily exposed here, 
but trenches dug in 1910 reached the layers and brought to 
light a considerable quantity of fossils. Debris from these 
excavations is still to be found along Buena Vista and other 
streets, and some fossils may possibly be obtained from it. 
The black shale with Beyrichia? clavigera, outcrop at the 
corner of Buena Vista road and Minto place, and a hard 
limestone with Loxoceras allumettense, Modtolopsis sowtert 
and other fossils was found above it along Buena Vista 
road. 
MECHANICSVILLE. 
Pamelia, Lowville, and Black River.—Going north on 
Carruthers avenue in Mechanicsville the strata of the 
upper part of the Black River are at or near the surface. 
These strata can be seen especially wel! near the crossing 
of the Canadian Pacific Railway, where they have been 
recently much quarried. The strata are thick-bedded, 
rather coarse-grained, light grey limestones, in which fossils 
are very rare. 
The Hull-Gloucester fault, which is a strong break, 
traceable for a long distance east of Ottawa, runs along the 
