1872.] Ai 7 [Lesley. 
feet more, higher up, consist of massive sandstones and heavy beds of i 
shale alternating. Just overlying the upper conglomeratic sandstone lk 
plate are variegated clay slates. / 
It is impossible not to see the significance of the immense develop- | 
ment of sandrocks and pebble rocks, in the Ocoee and Chilhowee systems, 
underlying the Lower Silurian Dolomites, and hugging the flank of the 
backbone of the Continent, for a thousand miles through Virginia, North | 
Carolina, Tennessee and Georgia, as in New Jersey and New York. It 
is a shore deposit on an immense scale, in a shallow sea, with a steeply 
inclined margin, and an Alpine range inland. No glaciers ; for the con- 
glomerates consist of rolled shingle stones; but torrents, innumerable 
and vehement. No large rivers ; for no delta deposits of any size are 
apparent. A rapid degradation of the mountains was followed or stopped i 
by a partial submergence, which deepened the sea, made the sand deposits | 
finer, and permitted the deposit of the Lower Silurian limestones. 
The reason therefore why the massive Quebec Group (Potsdam, Chil- 
howee and Ocoee) formation does not come up to daylight in the faults | 
which break the middle and northwestern parts of the floor of the region 
under discussion, is because it thins away rapidly seaward, that is, west- 
ward, towards the Coal Area. And in this it only sets an example after- 
wards followed by the sandstone and conglomerate members of the great ' 
Paleozoic system : Nos. IV, [X, X, and XII the Millstone Grit. 
Stated Meeting, July 19, 1872. 
Present, five members. 
Mr. Ext K. Pricn, in the Chair. 
A photograph for the Album was received from Prof. 
Thomas Chase, of Haverford, Pa. 
Letters acknowledging receipt of publications were re- 
ceived from the Royal Society, London (86, 87). The Royal 
Saxon Society (86); the Zoologico-Botanical Society, Vienna i 
(Vols. 8 to 11 Proc.,and Trans. Vols. XTI, XIII, GEV, i, ats | 
with a request to have the set completed. On motion, re- i 
ferred to the Librarian); and from Dr. Hornstein, Prag. (86). i 
Letters of envoy were received from the Observatorio de 
Marina de 8. Fernando, and the Physico-Medical Society in 
Erlangen. | 
A. P. S.—VOL. XII.—3F 
