1870. | GUNN—FOREST-BED AND CHILLESFORD CLAY. 555 
proboscidean remains, and an opening is made for the Forest-bed 
between them. 
It might be supposed to be easy to trace the Fluvio-marine Crag 
to the coast-section, and so to prove whether it dips beneath the 
Forest-bed or whether it overlies it and is identical with the 
Fluvio-marine of the coast-section ; but much difficulty arises from 
the Fluvio-marine crag inland being cut off and intercepted by the 
valleys of the Bure and of the Wensum, and several of their tribu- 
taries: and this difficulty appears to be increased by a slight up- 
heaval of the chalk to the west of those rivers. This may be seen 
by the elevation of the Chillesford clay at Bramerton about 15 feet 
above its level at the Brundall Station ; and the same may be noticed 
at Horstead and Wroxham, on the west side of the Bure, and at 
Hovyeton St. John, on the east side. 
On full consideration, I am inclined to the opinion that the 
Fluvio-marine and the Marine crags of the inland section are iden- 
tical with those on the coast. The freshwater beds in the coast- 
section, which are absent inland, impress me with the correctness 
of this view of the case, because they seem to have been laid down 
at a lower level on the first going down of the Forest-bed ; and then, 
when the level was obtained, the Fluvio-marine beds were spread 
over the freshwater beds and over the extended area of the chalk, 
which was covered with the bed of stones ; and then, in like manner, 
the Marine beds were laid down, including the Chillesford clay, 
which is admitted to be the same in both sections. 
The correspondence and junction of the several beds at both ex- 
tremities of the Forest-bed are almost conclusive in favour of their 
identity. 
On the other hand, the greater variety and quantity of mollusks 
in the Fluvio-marine and Marine crags of the inland sections may be 
regarded as evidence against their identity ; but such an accumula- 
tion of shells may be expected near the strike of the beds, where 
the water was more shallow than at a distance from the margin of 
the chalk *. 
I trust that the above observations respecting the stony bed 
upon the chalk, if not conclusive, may prove of service in deter- 
mining the relative ages and positions of the Forest- and other beds. 
Discussion. 
Sir Coartzes Lyett considered the Forest-bed to be newer than 
the stony bed. 
Mr. Guyw remarked that at Easton Bavent the Chillesford Clay 
is in the cliff, and the Forest-bed in the beach beneath it. He re- 
ferred to various instances of the occurrence of mammalian remains 
on the coast beneath the Chillesford Clay, whereas he had never 
found any above it. 
* A fresh complication has arisen from the discovery of the Tellina balthica 
in great abundance near Sherringham, beneath the Chillesford clay, and as low 
as the stony bed; but the introduction of these shells may be attributed to 
northerly currents of water, 
222 
