QUEBEC GROUP OF ROCKS, ETC. 43 
B’. Here we have Orthis 3, Pleurotomaria 2, Murchisonia 1, Ophileta 
1, Helicotoma 1, Nautilus 1, Maclurea 1, Othoceras 3 or 4, Cyrtoceras 
1, Bathyurus 1, Tilenus 2, Asaphus 1. Of all these fossils,—1 Orthis 
and 1 Camerella are common to B! and B?; the same Orthis and 
Camerella with 1 Leptena are common to B!, At, A? and A®. 
To the north of all these exposures, and on the nortli-west side of 
a synclinal running parallel with the synclinal already mentioned, 
fossils have been obtained in a cliff of about 100 feet, composed of 
limestone conglomerate, thin bedded limestones and shales. Their 
equivalence is not yet quite certain, but the strata are supposed to 
be not far removed from A! and A®. We shall eal! this cliff A. 
The fossils from it are Tetradium 1, Orthis 1, Trilobite (genus un- 
described) 1, with a great collection of compound Grapiolide, 
deseribed and being described by Mr. Hall under the genera Grap- 
tolithus 25, Retiolites 1, Reteoyraptus 2, Phyllograptus 5, Dendro- 
graptus 3, Thamnograptus 8, Diciyonema, 8. 
I have given you these details of localities, because as the subject 
requires further investigation we do not yet wish to commit ourselves 
entirely as to the equivalency of separate exposures. But there is no 
doubt that the whole is one group of strata deposited under one set 
of alternating circumstances. The whole fauna, as known up to the 
present time, is composed of—- 
APEC UAtE Oi 2etcs devessssns..cine OO SPeClEd. 
Motbosrannrc eens 2s. babudh BO? S042 
Sra Ol ii, Seis cc laseist sas ss cs 42 
MAGMA BY D281 isn da sonics sive tah 
137 
Of this fauna not one species is found in the Anticosti group, where 
we have a gradual passage from the fauna of the Hudson River forma- 
tion to that of the Clinton, and not one in any formation higher than 
the Chazy, Mr. Billings recognises one species, Maclurea Atlantica 
(Billings) as belonging to the Chazy, and six species as belonging to 
the Calciferous. They are Lingu/a Mantelli (Billings), Cameralla 
undescribed, Feeuliomphalus undescribed, Helicotoma uniacngulata 
(Hall), H. perstriata (Billings), and one remarkable species of an un- 
determined genus, like a very convex Cyrtodon/«, which occurs both at 
Mingan and Point Levi, All of the forms, particularly the trilobites, 
remind the observer of those figured by Mr. Dale Owen from the oldest 
it3 
ce 
