* 
Mineralogy and Geology. 267 
limestone, or Orbitolite limestone, eighty feet; 4. Vicksburg group, with 
a new species of Orbitolite— d 
This formation appears at Cape Sable, near Annapolis, where, at about 
the water level, “under a stratum of sand, and resting upon an imper- 
meable crust of ferruginous sandstone, lies imbedded in a layer of almost 
pure alumine, a forest of pine trees, thrown down by same ancient con- 
vulsion. The crust which forms the base of this aluminous layer is a 
de dness. 
tea mixed 
it much more extensive at the base of the Eocene. The bed of the At- 
recent and : 
be distinguished from the recent forms, except by one conversant with all 
> 
o 
a 
B 
S 
ce o ves conclusively that this was the case in 
North Carolina. gene cal Cretaceous feast are there mingled in a 
_ breccia. When I first saw this rock in 1832, no fracture or excavation 
revealed its true character; but the.external resemblance to the Timber 
_ Creek limestone of New Jersey, with its corallines, was striking. ihe 
_ ‘Mixture of Secondary and Tertiary species in this breccia, shows t wr 
disturbance occurred in the bed of the Eocene ocean, w oviden 7 
? Durand, Journ. Philad. College of Pharmacy, v, 12, 1834. 
