I51 
specimens are now rare. Among the more remarkable 
fossils which have been found here are Edrioaster bigsbyi, 
Comarocystites punctatus, Cyclocystoides hallt, Isotelus 
latus and Amphilichas cuculus. The strata in this quarry 
are rather thick-bedded, coarse-grained, gray limestone, 
separated by black shale partings in which most of the 
fossils are found. 
Farther north near the concrete bridge, is another 
quarry showing the cherty beds of the crinoid zone, the 
whole thickness of which may be seen in the Fleming- 
Dupuis quarry beyond the bridge. 
The upper strata in the quarry at the cement works 
belong to the cherty “crinoid beds’”’ of the Trenton, but 
the excavation has been sunk through them and the Dal- 
manella beds, into the upper part of the Black River for- 
mation, 90 feet (27-4 m.) below the surface. 
CUMMINGS BRIDGE. 
Collingwood and Utica Formations.—Cummings bridge 
spans the Rideau river on the eastern outskirts of the city 
of Ottawa. On the western side of the bridge is a fault, 
not however exposed, between the Trenton and the Utica. 
On the east side of the river, 100 yards (91-4 m.) 
below the bridge, black shale outcrops are exposed on the 
river bank. Tvriarthrus spinosus, Triarthrus becki, and 
Leptobolus insignis are common here, and more rarely one 
finds Climacograptus typicalis. These shales are not in 
place, but have been obtained from trenches dug in the 
immediate vicinity. 
A few minutes walk along the river above the bridge 
and at a point opposite the Isolation hospital is an outcrop 
of the limestone and shale of the Collingwood, a formation 
which comes between the Utica and Trenton. The com- 
mon fossils are Ogygites canadensis, Triarthrus beckt, Dal- 
manella emacerata, Leptobolus insignis, Schizambon cana- 
densis, and Zygospira modesta. 
ROCKCLIFFE. 
Chazy.—To the west of Buena Vista station in Rockcliffe 
park, near the river, there is a low rock cut beside the path. 
One of the highest layers in this cut is a partially decompos- 
ed, impure limestone, with Camarotechia plena and a few 
