Marcou.] 
70 
[Nov. 7 
second district of the state of New York, so well described and 
classified by Dr. E. Emmons, as far back as 1842. Following the 
excellent work made by Emmons in Clinton, Franklin and St. Law- 
rence counties of New York, Logan simply extended the Champlain 
system into Canada from Rouse’s Point, St. John, Cornwall, Vau- 
dreuil, to Montreal island, Argenteuil and Ottawa. His detailed 
“Geological map” of that area published in 1852 (Quart. Journ. 
Geol. Soc. London, Vol. vm, pi. iv, p. 324) is good and is really 
the only commendable work made by the geological survey in the 
province of Quebec ; the only objection being the insertion of an 
important band of tertiary in the eastern part, which does not exist. 
Chazy and Potsdam villages being close by the boundary line, it 
was an easy task to extend into Huntington, Beauharnois, Chateau- 
gay, St. John, la Prairie, etc., counties, the typical groups and di- 
visions of Potsdam, Calciferous, Chazy, Trenton and Utica. It 
will seem, to any practical geologist who visits the country, that it 
would have been as easy to see, that as soon as we have left the 
Alburgh peninsula, the strata, on the east side of Lake Champlain 
and farther north, have absolutely nothing to do with the Calcif- 
erous, Chazy, Trenton and Utica of Chazy village, Chazy landing, 
Isle la Motte and Alburgh, and that we have there another and 
older system ; but such was not the case with the members of the 
geological survey of Canada. 
The second, and by far the largest portion of the province of Que- 
bec, extends from the northeastern end of Lake Champlain to New 
Hampshire and Maine and comprises the whole country north as 
far as Labrador. 
The stratigraphy is quite simple. We have, at first on the north- 
ern part of the St. Lawrence river, a narrow band of blue-black lime- 
stone covered by black slates varying from 300 to 600 feet in 
thickness, which follows the foot of the Laurentine mountains from 
the northeast of Montreal toward Industry, St. Cuthbert, Trois 
Rivieres, St. Ambroise, Charlesbourg and Montmorency Fall, as far 
as St. Joachim, the Bay of St. Paul and Murray Bay. Then it dis- 
appears entirely under the St. Lawrence river, or very likely has 
been destroyed entirely by denudation. Two patches of it exist 
still on an affluent of the Saguenay river and at Lake St. John. 
No other traces of it are found until the Mingan islands and per- 
haps the northern shore of Anticosti, and finally it ends at Long 
Point, Port a Port Bay in Newfoundland. 
That long narrow band is formed of Trenton and Utica with their 
