22 CONTRIBUTIONS TO THE GEOLOGY OF MAINE. [bull. 165. 
The Graptolite shales, the writer believes to be of Clinton age, but 
their stratigraphic position in the Maine series is not satisfactorily 
established. They may belong in the midst of the series 3, 4, 5, or even 
above them; more evidence will be needed to determine their position 
with certainty. 
The Chapman sandstone fauna is younger than the Square Lake 
fauna; the present opinion is that it corresponds closely with the Lower 
Oriskany of the New York and interior series. The identification of 
the fauna with Honeyman's Zone D Arisaig and with the ' ' Tilestone " 
fauna of Wales establishes its place at the top of the Silurian (see 
Am. Jour. Sci., 4th series, Vol. IX, p. 203). 
The Moose River fauna is a f acies of the Eodevonian, and represents 
the Oriskany. 
The Mapleton sandstone is the representative of the higher parts of 
the Gaspe sandstone, and is the Old Red sandstone facies, not expressed 
in New York until a point higher up, in the Catskiil sandstone, is 
reached. 
Besides these terranes, determinable by their fossils, there are slates 
and crystalline rocks, the precise age of which is undetermined. The 
slates are presumably Cambrian or pre-Cambrian. 
In the paper prepared by H. E. Gregory (Part II) the several ter- 
ranes are described from a lithblogic and petrographic point of view.. 
In the following pages (Part I) the faunas are described and grouped 
together in the combinations suggested by their contents and by the 
character of the rocks containing them. In the two papers combined 
are presented the preliminary results of the writers' investigations, so 
far as they concern the interpretation of the geology of the regions 
studied. Many problems are raised which will require further petro- 
graphic and paleontologic investigation for their solution. 
For purposes of comparison the typical sections of the Silurian and 
Devonian of the Canadian survey, including the Anticosti Island and 
the Gaspe Peninsula, are important. The interpretation of these sec- 
tions was made by Sir William Logan, and was reported in a summary 
form in the Geology of Canada. The sections of particular importance, 
for the present purpose, are Nos. 10 and 11 of PL IV. 
Section No. 10 is described in the text as follows: * 
This line extends from Ste. Anne des Monts, on the south bank of the Gulf of St. 
Lawrence, in a south-southeast direction across the Peninsula of Gaspe to the mouth 
of the Great Cascapedia River on the Bay of Chaleurs. Commencing witvi the Quebec 
group, it crosses the Shickshock Mountains, which are formed of altered Sillery rocks, 
and the Barn-shaped Mountain, an intrusive mass of trachytic granite. It then 
traverses a great breadth of Upper Silurian, which rests unconformably upon the 
Quebec rocks, and presents two subordinate basins, in both of which appears 11 e 
great Gaspe sandstone formation of Devonian age. This, in the southern basin, on 
the Bay of Chaleurs, is seen to be unconformably overlaid by the Bonaventure forma- 
tion belonging to the Carboniferous period. The whole length is 68 miles. 
1 Geol. Survey Canada. Report of progress from its commencement to 18G3. Atlas of maps and sec- 
tions, 1863, PI. IV, and text of explanations, p. 26. 
