142 
the tertiary geology op the 
is tl.e true » White Limestone,” an exponent of the Jacksonian group of deposits, as 
is clearly indicated by the character of its contained fossils * Were it otherwise the 
case it would be very difficult to explain the total disappearance over a distance of 
only thirty mUes (and with but exceedingly moderate dip) of the equivalent beds 
exposed on the Alabama River at Claiborne. The upper moiety, on the other hand, 
is a portion of the well-known Orbitoide (Vicksburg or Oligocene) rock, and is that 
which alone contains specimens of OrUtoides Mantelli (Winchell, loc. cit, p. 85). 
From the data here presented, a section of the Tertiary strata traced along the 
Tombigbee River from Wood’s Bluff to St. Stephen’s, may, with considerable approach 
to truth, lie constructed as follows : — 
Wood’s Bluff- 
iU 
/oo Jt. 
C\t.y (so.ys) 
I Llipilto 
I Lam Clay 
/OOjt. 
^ See-tUn^ abauir^Sfn, — "Dip 
Bt Stephens 
Cla-iitom* SanJs. 
Orbit 
Baahia : 
•Cy-M* Bluff 
Tombigbee Biver > - 
Baker’s Bluff 
Glaib- 
tf-yoo 
Wood’s 
T lie foregoing section shoirs almost conclusively that the Eocene deposits of Ala- 
hania have a thickness of very nearly 400 feet ; and, indeed, Dr. Smith, State Geolo- 
flo^J ,r"” "o that Tertiary beds occur 
" mT Tn'T'’'’'’- >50-180 feet heloiv the 
proZr rir a i ' «« “Claihornian” (or Claiborne 
near llie ton of Ih ^ fossihferous greensands) holds a position decidedly 
■‘CnleaireGroa,ier'”7l'rrManrof°Ftatrr' «'"*'ar to that occupied by the 
— ) France, more properly Upper than Middle Eocene, 
(upper “thn^utherTuS”^^^ «tescribed as cbaracteri.stic fossils of the newer Cretaceous 
n.ted States, have been found abundantly near the base of the bluff. 
