568 AMERICAN ASSOCIATION 
feet long, and shows the territory bounded by the Ellis, Saco and Peabody 
rivers. It is colored to show the distribution of the several formations. 
M in 
ries; (2) granite; (3) e tcs si granites and traps; (4) Staurolite and 
andalusite rocks belonging to t 06s group. he first group composed. 
main range of mountains in sies from north to south, namely: Mad- 
ison, Adams, Jefferson, Clay, Washington, Monroe, Franklin, Pleasant, 
Clinton, Jackson and NA bster. Contrary to previously received opinions, 
it was said that the structure of this ridge is anticlinal and not synclinal, 
and the force crowding it up came from the north-west instead of south- 
east, as is the case everywhere else in the country. The relations of the 
granite to the schists is interesting. Ir is plain that the immense d 
ea was eruptive, for at the boundary of the two en 
granite had been injected into the schists. In the Saco hin ene di 
Notch, the granite occupies the lower area, and the schists upon th 
is the softest rock among the mountains, and therefore it is Ofen chiefly 
in the valleys. These valleys have very abrupt sides, thus resembling the 
Yosemite a in California. The Professor could not agree with the 
theory of the California geologists, that the bottoms of these valleys had 
fallen out, sis rather believed in the old-fashioned theory of denudation. 
The Coós group is à new one, it is not less than ten thousand feet in 
Teten ap is dpi of à quartzite Pin limestone with staurolite 
slates and schists. It is characterized by the presence of silicates of 
alumina destitute of — — and the minerals are staurolite, andalusite, 
and kyanite. Formations containing these minerals occur in New Hamp- 
shire, Vermont, Medus Canada, Nova Scotia and New Brunswick, 
and they were referred to this new group. The same had been described 
by te Hunt a eeks previous in the ** American Journal of 
cience” as the Terranovan series, and some fossils of the am Pe- 
ri ad been found in it in Nova Scotia. It would hence appear that this 
ciently supposed position of the inita System. — system had been 
results would not follow the proposal ms ae new Coós Grou 
e next exhibited specimens of a new species of idee (Acidaspis 
ieu from New Jersey, obtained from a boulder which was trans- 
ported from New York by the glaciers. It came from the Marcellus slate. 
No other species of this genus had derer num been found above the Scho- 
harie grit. 
Professor C. H. Hrrcncock presented an argument to prove that a large 
portion of the North American Continent had been submerged beneath 
the interior along the great lakes. These were specified by name and 
locality, extending up the Hudson River and Champlain valley and the 
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