364 — J. M. Safford on the Cretaceous 
yet it is difficult to obtain good specimens. None that I know 
fossils, to Mr. Wm. M. Gabb, of Philadelphia, who described it 
as Volulilithes Saffordi, giving “Tennessee” by mistake as the 
locality. (Jour. Acad. Nat. Sci., [2], iv, 299.) The specimen 
was obtained from a cut about three miles and a half west of 
2. The Green Sand, or the shell-bed.— At many points along its 
eastern edge this bed is seen resting upon the Coffee sand. I 
mass consists generally of fine quartzose sand mixed with clay, 
forming a clayey sand, which is more or less calcareous. It con 
tains green grains throughout, though not abundantly, and fine 
7 
scales of mica. Owing to the clay present and a certain degree 
of the series. 
Below the soil, for ten or twenty feet from the surface, the 
Green sand is usually converted by atmospheric agencies into? 
greyish or dirty-buff tenacious material locally called goin a 
from its tendency to cleave, when losing moisture, in irregula! 
block-like masses. “cee 
It abounds in shells. Exogyra costata, Gryphcea vesicularts, r 
trea larva and Anomic, are found at nearly all exposures. r 
numerous points, whitish clayey or marly “bald places, ° 
“glades,” nearly or quite destitute of soil and vegetation, #@ 
to 
* To obtain good water in the region of the Green sand it is often necessary 
bore through the formation to the Coffee sand. Upon reaching = drinkable wa 
ng 
