thk tertiaky geology of the 
«r,. not contained in the older rocks, as Pceto memkraumm P .ahain,, 
TlrvUnn.. C.,„. ,yr,.n„, several of the Ech.nodermata, etc, hnt wh.ch, or a 
,her of n hich, on the contrary, are to be fonnd tn the s«pi>osed newer strata o he 
Conner Hirer, presently to be noticed. Furthermore, ,f the remains of Zc^Mon 
referred to by ■luomey as having been found in these deposits actually belonged there, 
and there appears to be no reason for supposing that the observation rests on erroneous 
data then we are forced to admit that the beds in question represent a horizon above 
that'of the Clailiorne sands on the Alabama Eiver, and more nearly that of the over- 
lying white limestones. The evidenee, then, is strong for concluding that the Santee 
calcareous strata form part of the true Jackson series.* In separating the Ashley 
and CoopiT series from the .Santee Mr. Titomcy appears to have been influenced 
principally by paleontological considerations, rather than by considerations draw-n from 
stratigrapiiical position, although he alludes to the superposition of the beds in question 
over tho.se of the Santee.f Hut if, as is contended,^ many of the fossils of the Ashley 
arc found on the Cooper, and elsewhere, but as a group they are very distinct from 
those of every other bed in the State, might it not be assumed, in the absence of facts 
jiroving direct stnitigraphic continuity, that the two members (the Ashley and the 
Cooper) of the scries indicated are in themselves distinct 1 But yet they are grouped 
as one by 'ruoiney, and not improbably so with reason. And if one, why separate the 
scries from the Santee ? We fail to discover from Tuomey’s writings that any material 
difference e.xists lictwecn the faunal facies of this last and the deposits exposed on 
('oo]>er River ; on the contrary, a very considerable number of the forms are common 
to both, and among these we have the forms that have already been referred to, 
Pecten memhranftxns, P. calvatm^ P. perplanus, Conus gyratus, etc., besides the Zeu- 
glodon, which ranges through the Santee, Cooper, and Ashley beds. There appears 
to me to l)e no good reason for separating the above deposits from each other as indi- 
cative of special horizons, although they may occupy different stratigrapiiical positions 
in the geological .scale, and, therefore, I have retained them as one group, the cor- 
respondent of the “ Jacksonian.” 
Oi.iGOCENE. — hat the precise age of the beds on Tinker’s Creek and along the 
Savannah opposite and below Shell Bluff, in Georgia, containing Ostrea Georgkma, 
is — whether upper Eocene (“ Shell Bluff ” group of Conrad) or Oligocene — still 
remains to be determined. It appears not unlikely that Hilgard’s supposition as to 
their being of \ icksbnrg age,§ and their correspondence (as was maintained by Conrad) 
with the oyster-bed underlying Vicksburg Bluff on the Mississippi lliver, whose 
position is iK’twecn the Jackson and the Vicksburg, is a correct one, although the 
* 0$trtn panda, one of the d sfnetive Santee fossils, is 
St. Stephen’s Bluff, on the Tomhigbee R:ver, Ala. 
f Op. eit., p. Ica. 
I Am. Joum. Science, new series, vol. xlii, pp. 68-70. 
found abundantly in tl:e basal portion (Jackson) of 
t Op. eit., p. 163. 
