Proceedings of the British Association. 341 
ance suggested the idea of a great rush of waters.—Mr. Conybeare 
was perfectly willing to correct his opinion respecting the existence 
of the remains of mammalia in the crag. He was of opinion that 
the tertiary strata of America had not been sufficiently examined to 
justify the conclusion that it did not contain remains of the masto- 
don. He started a question—which of the species of mastodon 
found in other countries did the British one resemble ?—Mr. Green- 
ough mentioned, as a singular peculiarity of the diluvium of Nor- 
folk, its containing large masses of chalk, which contain organic re- 
mains differing in some respects from those of the chalk in situ. 
The town of Cromer seemed to be built on an immense block of 
chalk, contained in the diluvial formation.—Mr. Murchison dissented 
rom Mr. Greenough’s opinion. He conceived the formation of 
chalk was under the diluvium, and had been elevated and disrupted. 
He had seen at Hazeborough large platforms of chalk laid bare after 
a storm; near that place were needle-shaped rocks of chalk, and at 
Cromer the foundation of the town must rest on part of the same 
mass. ‘There were strong reasons for believing that the Norfolk di- 
luvium contained recent dhelis only. Mr. Lonsdale, on examina- 
tion, could discover no others.—Mr. Charlesworth mentioned, that 
Dr. Beck considered the shells of the tertiary period to be sonsinelh 
species, and that at the formation of the Norfolk crag the climate 
must have been very cold, like the Arctic regions. He c 
the diluvial formation to have been sufficiently searched to warrant 
an opinion that it does not contain the remains of the mastodon. 
Many singular organic remains have been found there, which have 
been transported, as of saurians, which must have come from York- 
shire. In alluding to the fact of shells similar to those of the crag 
being found at Bridlington, he was informed by Mr. Sedgwick that 
the formation at that place was probably part of the crag. 
A paper, by Mr. J. B. Bowman, was now read, on the Bone 
Caves at Cefn, in Denbighshire. A description of these has been 
already published in the Edinburgh New Philosophical Journal. 
The caves are in the carboniferous limestone. The roof of the 
lower cave is covered with stalactites, which are often broken off or 
blunted. The diluvium on the floor contains fragments of slate, 
and the upper portion animal remains in great abundance. Among 
these are some of a very minute size, and also elytra of beetles. A 
black matter is also found, with veins of reddish clay. The bones 
are often in fragments ; the teeth are somewhat worn ; sometimes 
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