24 Phosphate Rocks in South Carolina, 
The Meiocene is represented, in Plate I, as being 
parallel with the Pleiocene, that is to say of the same 
age; geographical position may have caused the zoo- 
logical difference. Formerly these beds were sup- 
posed to be Meiocene, but Professor Tuomey and 
the writer carefully studied them, and discovered 
that they are younger and contain a greater number— 
forty-two per cent.—of recent or living species than 
the Meiocene of Virginia, which contains only thir- 
teen per cent. (See Tuomey and Holmes’ Fossils of 
South Carolina, p. viii.) 
THE AGE OF THE PHOSPHATE-ROCK— 
BASINS OF THE ASHLEY AND OF PRE- 
HISTORIC MAN. 
Next in the geological series, as seen in the dia- 
gram, Plate I, are the beds of this exceedingly inte- 
resting age; the period in which (as indicated by the 
fossils collected) man first made his appearance on 
this Continent. To our mind the Post-Pleiocene is 
the connecting link between the Azte-Historic or Ter- 
tary, and the fstoric or Recent age; and may be 
properly designated the age of PRE-HISTORIC 
MAN. 
Formerly, and before these beds had been carefully 
studied, they were supposed to belong to the Tertiary, 
and therefore considered (and in the tables of classi- 
fication, placed) uppermost in the division according 
to Lyell’s arrangement, being the youngest. But 
