64 
THE GEOLOGIST. 
of both the Carolinas and Georgia, and almost the whole of the 
two rioridas and Lower Louisiana. 
That no volcanic productions have yet been found east of the 
Mississippi, is not the least of the many prominent features of 
the Geology of America. 
[For map see frontispiece.] 
On Drifted Remains found in Gravel, near Radwell, Heists, 
By W. Stocken, Esq. 
The remains in question are found in a stratum of gravel, 
about four feet under the surface, at Radwell, a small village in 
Hertfordshire, about two miles north of Baldock, and about a 
quarter of a mile from the Beds marl-bed. The bed of gravel 
itself is of very slight thickness, reposing upon a bottom of chalk 
about 5i or 6 feet from the surface. The remains found in it 
are very limited also as to variety, but abundant in quantity 
those, perhaps, in my possession are about the finest which 
have been met with, and are sufficiently perfect to enable me 
to judge of the specific characters. The first (Fig. 3.) is a 
portion of Ammonites perarmatus, consisting of seven sectional 
plates, each of which, when detached, presents the appearance of 
lobes and saddles, as described by D^Orbigny in Geologist, vol. i. 
p. 100. This species appears to be predominant, although the 
examination of several smaller specimens would almost lead us 
to the supposition that they belonged to individuals of A. ohtusus. 
These specimens generally consist of from five to seven sectional 
plates, each averaging in size 4 inches in length, inch in 
lateral breadth, and about \ an inch in thickness. 
The specimens figured in plate 2, are of a hard calcareous 
crystalline substance, many of them circular in form and others 
closely resembling fig. 1 in this plate ; associated with these are 
large masses of septaria, the calcareous div isions in which bear 
