110 Proceedings of the Association 
In reply to Dr. Emmons, [an abstract of whose remarks on the 
Taconic system we have not received,| it was stated by Prof. 
Adams that he (Dr. E.) had misunderstood the description of the 
calcareous rock over the Hudson river shales, which was not af- 
firmed to be the Trenton limestone, but an upper member of the 
Hudson river shales, as proved _ the contained fossils in connec= 
tion with the position. The remarks of Dr. E. being based on 
this misconception of the anne actually made, could not of 
course affect the conclusion respecting the age of the rocks of © 
Snake mountain. 
7. Observation on a Polished Rock ; by Prof. C. B. Apams.— 
The outline of a shelving rock in the valley of the Winooski, 
Vt., shows that the rock had been struck on the perpendicular 
west side, and well rounded and polished as far as the summit, 
leaving the east as the lee side not acted on. The shelving part 
also on the west side, which is beneath and within the perpendic- 
ular tangent to the surface, ‘is also destitute of any marks of drift 
pote meni proving that the agency was that of a solid body. 
Clays ;_by Prof. C. B. Apams.—A series of claystones 
Pa exhibited in in illustration of the remarks made on concretions 
traction by which they are formed, but it was shown to be a sub- 
ordinate law that the attraction is in the direction of the radii . 
a sphere towards the centre 
9. On the Remains of Marine. Shells of ‘Baketivags Spociét 
Sound interspersed in deep portions of the hills of Drift and 
B in. the yn, on near 
Ish 
New York City; by W. C. Reprieny.—These remains had long 
—_— attracted the raat of Dr. Mitchill and other naturalists 
the vicinity, but the true character of the formation and the 
wistios positions in which the shells were found, were not dis- 
tinctly known to geologists. 
It fortunately happened that M. Desor and Count Portals, while 
on a visit to Brooklyn a few months since, discovered frag- 
ments of these remains in the great masses of boulder drift in 
South Brooklyn, through which the new streets are being exca- 
vated. At their invitation Mr. R. had examined the place, in 
company with Prof. Agassiz, and had obtained a variety of speci- 
mens which were found at depths varying from twenty-five to 
Gousy feet below the original surface of the hills in which — 
were imbedded. 
Since that occasion Mr. Redfield has found similar remains in 
these hills, about two miles northward from the first locality, and 
ected numerous specimens which he exhibited to the 
meeting, together with samples or anacaetie “i the original beds 
inclosing these shells, which had been disper ed by the drift and 
