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have been faulted down to the south of them. This fault 
is exposed at the base of the bluff around the point, where 
the dip of the strata becomes so steep that the cherty beds 
below the Tetradium beds are brought to view. 
Another and greater fault in a gully beyond, exposes 
the Pamelia limestone. Between these two faults is a 
small block of nearly horizontal strata with Black River at 
the base, and Dalmanella beds above. 
Tetradium occurs in the pure blue limestone of the 
Pamelia, which is followed by yellow-weathering beds, 
dipping toward the north and containing few fossils. Above 
the rusty beds, pure dark limestone layers with ostracods, 
pelecypods and bryozoa, are again encountered, and these 
strata may be followed around into a cove, where a con- 
cealed fault brings them against the shale and sandstone of 
the Aylmer. 
On the path up from the cove to the electric car station 
Camarotechia plena may be found in a thin limestone inter- 
bedded with green shale above the sandy part of the 
Aylmer limestone. The limestone of the Trenton is in 
close proximity to this outcrop, but, though it belongs to 
a horizon below the Prasopora beds, its exact position in 
the section is not known. 
CHAUDIERE FALLS. 
Trenton.—Near the foot of the hill on Wellington 
street the perpendicular cliff of Upper Trenton limestone 
shows, in its lower part, strata belonging to the cystid beds, 
and in its upper part the Hormotoma trentonensis beds. 
On the north side of the river at Chaudiere falls are 
excellent exposures of the thin-bedded limestone of the 
cystid zone. Pleurocystites elegans, Agelacrinites billingst 
and other rare fossils are found here, in addition to the more 
common species. These beds are a continuation of those on 
the Ottawa side of the river, from which Billings obtained 
the types of many of his specimens of echinoderms. 
The strata on the little island between the two bridges 
belong to the same zone as the rocks on the north shore of 
the river, and A gelacrinites isfoundin them. The exposures 
here show well the way in which the fossils are grouped in 
little depressions in the irregular surfaces of the layers. 
Between this island and the next piling ground there 
is a small fault, beyond which the cherty crinoid beds are 
exposed in a quarry at the top of the ridge. 
