470 Proceedings of Philosophical Societies. [JUNE, 
species of strawberry known in this country, though some of them 
assume many various appearances. 
At the saine meeting, a description of some fossil bones found on 
the coast of Norfolk, by Dr. Arnold, was read. ‘The bones in ques- 
tion had some resemblance to those of the turkey; but the author 
of this paper did not attempt to make them out. 
At the same meeting, some further observations on alcyonia, by 
Dr. Arnold, were read. 
GEOLOGICAL SOCIETY. 
Nov. 15, 1816.—A paper by W. H. Gilby, M.D. of Bristol, on 
the Magnesian Lime-stone and the red Marl of the Neighbourhood 
of Bristol, was read. 
The strata in the neighbourhood of Bristol may be distinguished 
into two classes. The older of these comprehends the old red sand- 
stone, the first floetz or mountain lime-stone, and the coal forma- 
tion. The beds of the two former are highly inclined, and enclose 
within their lines of basset irregularly elliptical areas, towards the 
interior of which they dip on allsides. ‘The coal formation fills up 
these areas, the lower beds of which at least dip conformably with 
those of the lime-stone on which they rest, and at an equal angle. 
The second, or newer class of strata, is horizontal, or nearly so, in 
its position, and lies unconformably on the tilted edges of the strata 
first mentioned. It is composed of the various beds which form that 
extensive and important deposit which is generally known by the 
name of red ground or red marl. Of these beds the lowest is a 
conglomerate of fragments of common lime-stone cemented by 
ferruginous sand, above which are beds of red and white calcareous 
sand-stone, and then a deposit of red clay containing gypsum and 
sulphate of strontites. At Portishead, a village on the Bristol 
channel, the conglomerate makes its appearance, but exhibiting 
some peculiarities in its external characters ; the basis, in particular, 
being of a yellow colour, and resembling the Yorkshire magnesian 
lime-stone. This circumstance induced Dr. G. to make a chemical 
analysis of it, which ascertained it to contain 37°5 per cent. of car- 
bonate of magnesia. It may be traced along the shore from the 
village just mentioned to Clevedon, every where containing the 
same fragments, and lying in horizontal beds on the inclined strata 
of old red sand-stone. It is, therefore, in Dr. G.’s opinion, to be 
regarded as a mere variety of the common lime-stone conglome- 
rate, and as occupying a geological situation precisely similar to the 
magnesian lime-stone of the north of England. Dr. Gilby also 
mentions that magnesian lime-stone sometimes occurs in beds in- 
terstratified with the mountain lime-stone, 1. At Ross, in Here- 
fordshire, where it assumes the appearance of dolomite. 2. About 
four miles north-west of Bristol, where it abounds in shells, en- 
trochi, and madrepores. 
A notice from Mr. Sowerby was read on some Fossil Organic 
Remains found on the banks of the Tagus, near Lisbon. 
These remains are an ostrea similar to the ostrea virginia, Linn. 
