E. Desor on the Post-Pliocene of the Southern States. 49 
Arr. IX.—Post-Pliocene of the Southern States and its relation 
to the Laurentian of the North and the Deposits of the Valley 
of the Mississippi ; by E. Desor. 
Neuse in North Carolina. How much farther it extends to the 
south along the coast of Florida, has not yet been ascertained.* 
As far as their composition goes, these deposits are very homo- 
geneous, generally composed of sand and clay, in regular stratifi- 
cation, so as to convey at once the idea of a prolonged and quiet 
deposition. In this respect they are essentially different from the 
coarse drift, and from many of the stratified deposits at the north, 
which frequently contain scattered boulders, the transportation of 
which becomes an interesting subject of enquiry. 
- this problem, which would require more time an 
From what we know of the structure of Anastasia Island opposite St. 
gustine, on the caheit obaat tie weseik. it appears probable that it to the 
Same formation, the island being comp to M. Dietz, of horizontal 
layers, of a semi-indurated rock consisting wholly of fragments of shells, belonging, 
pre &$ examined, almost cea Bl Nance woe ae . a 
are principal Arca; they are Arca a, Say, A. 
Say, 4. ot a pally ae von cae Say; also Lutraria canalieulate, Say, besides 
a Mactra, a Donaz, a Orepidula and a Lucina, Natica, Oliva and Buceinum trivit- 
Szconp Sznres, Vol. XIV, No. 40—July, 1852. " 
