147 
limestones, with Platystrophia lynx, Parastrophia hemi- 
plicata, Dalmanella rogata, and many other forms. This 
is the same as the oldest Trenton fauna found along Lake 
Champlain and in the vicinity of Quebec. These lowest 
beds are well shown in the extensive quarry north of 
Normanville street, where, however, few fossils can be 
obtained. 
In another large quarry beyond the railway track, 
the upper beds, about Io feet (3-0 m.) in thickness, belong 
to the Cryptolithus tessellatus (Trinucleus concentricus) 
zone, the characteristic fossils of which, beside the diag- 
nostic tribolite, are Triplecia nuclea and Trematis terminalis. 
The Parastrophia beds are about 35 feet (10-6 m.) thick, 
and the Cryptolithus beds 40 to 50 feet (12-2 to 15-2 m.) 
thick. 
The top ofthe limestone in the quarry is a well 
striated surface, on which rests a thin layer of boulder clay. 
Above the boulder clay is a thin, but very fossiliferous 
layer of Saxicava sand, 1 to 3 feet (-3 to -9 m.) thick. 
The Prasopora beds are exposed in two quarries near 
the corner of Iberville and Masson streets. In the thin 
bedded limestone of this zone the following fossils may be 
found:—Prasopore, Dinorthis meedsi, Platystrophi lynx, 
and Sinuites cancellatus. 
St. VINCENT-DE-PAUL. 
Black River and Trenton, with intercalated Igneous Beds. 
—The lowest strata in the section in this neighbourhood 
are exposed at the ferry. The beds dip up-stream, and 
consequently in going in that direction successively higher 
beds are crossed. The yellow-weathering beds first en- 
countered belong to the Lowville, some layers of which 
are quite fossiliferous. The contact with the Black River 
is 600 feet (183 m.) from the ferry, the lowest layer of 
the upper formation being 4 inches (10cm.) thick and 
made up of a solid mass of so-called fucoids or branching 
sponges. The hard surface of the Black River beds shows 
well the effects of glaciation. 
Near the last of the small summer houses, the beds 
begin to show plates of black chert, and some of the layers 
beyond this point are full of them. The surfaces also show 
pee specimens of Hormoceras, Columnaria hall and other 
ossils. 
32224—104 
