History of the Quebec Grovp. — Hunt. 221 
lated by me in 1870 and 1871 was but a return, fortified by a great 
accumulation of stratigraphical and lithological evidence, to the 
old conclusion that the Green Mountain range represents an anti- 
clinal axis of primitive schists, as shown by Amos Eaton in 
his engraved sections published in 1824, and again in 1832, and 
constantly maintained and taught by him and by Ebenezer 
Emmons. 
Having thus disposed of the question of the age and struc- 
ture of the Green Mountain range we come to the more particu- 
lar history of the uncrystalline sediments, of the vicinity of Que- 
bec, as seen in the sections of Sillery, the island of Orleans and 
Pointe Levis. Whether referred to the Second or later to the 
First Gray wacke, whether called Hudson-River group or Quebec 
group, the apparent succession, as described by Logan in this 
typical region,was assumed to be the true one. The massive and 
apparently overlying sandstone of Sillery was declared to be the 
newest and the Levis division the oldest of this great series of 
strata. From many j'-ears of careful study of this vicinity, and of 
other out-crops of the same rocks elsewhere, I was however led 
to an opposite conclusion, which so far as I am aware was first 
set forth in 1872, when it was said : "If, as I am disposed to be- 
lieve, the southeastward-dipping series of the older strata 
near Quebec exhilnts the northwest side of an overturned and 
eroded anticlinal, in which the normal order of the strata is 
inverted, then the Lauzon and Sillery divisions which there ap- 
pear to overlie the Levis limestones and shales are older rocks, 
occupying the position of the Potsdam, or of still lower mem- 
bers of the Cambrian." Billings in a private communication to 
me in 1876, a little while before his death, expressed his ap- 
proval of my view, which was in accordance with his paleon- 
tological studies. 
The same view was again set forth in a note on The Quebec 
group in Geology, read before the Boston Society of Natural 
History, October, 1876. (Proc. xix pp. 2-4.) Therein it was ex- 
plained that the series of rocks to which Logan had given that 
name near the city of Quebec have a measured thickness of 
over 5000 feet and dip at a high angle to the southeast. "The 
whole was described by Logan as having originally occupied 
a position conformably beneath the Trenton limestone of the 
vicinity, and as having been brought to the surface by a great 
break and uplift of the strata. The speaker however showed 
