‘96 T. A. Conrad on a new group of Eocene Shells. 
Art. XIV.—WNotice of a new group of Eocene Shells; by 
T. A. Conran. 
of the relations of these Miocene localities en, however, 
we find dey beds in juxtaposition, the testacean groups of which 
differ entirely in species, and the evidence is clear that the 
must hav lived and died in or near where they are now found, 
we are a that‘ in giving each group a distinct name, and in 
them. I propose therefore to disti uish this crim ioe) of tes- 
tacea by the name of the moe Bluff group, the situation of 
which is in the Upper Eoce There is no town near its out 
crop other than Vieksure fey which its ideality could be more 
ag 6 indicated, but it is only in Warren Co., Miss., that the 
up can be clearly defined by other ‘fossils than Ostrea 
eorgia 
The following section will show the relative position of this 
group: 
Vicxspure Buourr. 
Calcareous silt with land shells of recent species, 10 to 20 feet. 
Bluish and yellowish hardpan, often pebbly,—orange sand, Sat ade 5* 20 * 
Vicksburg roup.—Marl, ete. 60“ 65 “ 
Jackson Croup.—Orbitolite limestone. 
sao — 
lignite clay and gray sand with Ostrea Georgiana Conrad, 
Corbula alta Con., Natiea? Mississipiensis Con., Clavella Vicks- 
burgensis Con., Triptonopsis subalveatus Con., Busycon nodula- 
Con 
Gray or biack lignitic clays and sands, 
Solid lustrous lignite, 
