292 T.S. Hunt on some points in the Geology of Vermont. 1 | 
Art. XX.—On some points in the Geology of Vermont; by 
T. Srerry Hunt, F.R.S., of the Geological Survey of - 
Canada. : 
(Read before the meeting of the American Association at Chicago, August, 1868) 
Ir is proposed in the present communication, to state some 
facts with regard to the distribution of the paleozoic rocks of 
western Vermont, but before doing so it will be well torecall 
certain points in the geology of the province of Quebec. In this” 
province, to the soatheast of the St. Lawrence, there is dit 
played a great series of rocks to which Sir William Logan has _ 
given the name of the Quebec group. In the geology of C 
published in 1863, this group was divided into two parts, am 
npper called the Sillery, and a lower the Levis formation, while 
some black limestones and shales occurring at the base of 1 ot 
latter were referred, doubtfully, to the Potsdam formation. — 
These have, however, since been found to be paleontologiemy — 
Quebec, the wh 
4680 feet at Phillipsburg with the addition of the iowa : 
group, seen at Phillipsbure ot brought into view. 4° 
group, illipsburg, are n g found conveni 
ing part of what was at first called by that name, & 
upward to the base of the Sillery, is distinguished as the. 
formation. + 4 
The entire thickness of the Levis, so far as known! 
6,000 feet, and that of the Sillery about 2,000, while the 
zon is extremely variable, ranging from a few undred to 
sian and metalliferous rocks, one near its base, and 
its summit. The latter band, for convenience of defintti 
been united with the succeeding division or formation, 
‘ ng Das’ de 
ry. These two magnesian bands are of considera 
nomic importance, and contain interstratified deposits O” 
iron and chrome ores, together with dolomite, Mag”™” 
tite, serpentine, diorite, chloritic and epidotic rocks, 8 
ddish and greenish shales and sandstones. 
area of the Quebec group is as yet! 
bella twi i 
and two species of Lingula in the Sillery 
