898 



HISTOEICAL GEOLOGY. 



1490-1496. 



Eocene. — Vicksburg group. — Fig. 1490, Pecten Poulsoni ; a, section of same ; 1491, Mortonia Eogersi ; 1492, 

 Ostrea Georgiana l,x^), Vicksburg (?) ; 1493, Area Mississippiensis ; 1494, Orbitoides Mantelli; 1495, Lyria. 

 costata ; 1496, Dentalium Mississippiense. Figs. 1490-1492, 1494, Meek ; 1493, 1495, 1496, Conrad. 



1497 



1499 



Miocene. — Chattahoochee group. — Fig. 1497, Turritella Tampaj (x §) ; 1498, Pyrazisinus campanulatus ;. 



1499, Ceritbium HUlsboroense. From Dall. 



