222 Proceedings of Philosophical Societies. [March, 



Beds of plated flint, varying from half an inch to 14- inch in thick- 

 ness, also occur, and have been traced for one and two miles iu 

 length. Some of the beds of continuous flints are of the thick- 

 ness of 18 inches. A hard chalk marl, 18 inches thick, is also 

 contained in this bed. Below this bed lies a chalk, consisting 

 chiefly of organic remains ; in which numerous flints of peculiar 

 forms are interspersed, and a few strata of flint run along it. 

 This bed is above 100 feet in thickness, is of a yellow colour, 

 and is harder than the upper bed just mentioned ; but it probably 

 belongs to the same deposit. Its flints appear, generally, to 

 have been formed on organized bodies. The fossil echini with 

 which it abounds are rarely depressed ; and the chalk within 

 them is generally coarser than that of the bed, and of a sandy 

 aspect. This bed is separated from the following by a bed of 

 marl, two or three inches thick ; and two other beds of marl are 

 observed to lie in it. 



2. Chalk, with few flints. This chalk is soft and white, though 

 not of so pure a colour as that with numerous flints already 

 described. It contains a few thin beds of organic remains, and 

 two beds of soft chalk marl, as well as a few thin beds of flint, 

 which have not the regular disposition of those in the upper 

 strata. In this bed, Mr. Phillips has met with ammonites of a 

 large size. 



3. Chalk, without flints. The Separation of this bed from the 

 preceding has not been distinctly traced ; but there is a consider- 

 able difference between them. Mr. Phillips considers it to con- 

 sist of the two following subdivisions : first, a thick stratum con- 

 taining numerous beds of organic remains ; secondly, a stratum 

 about 50 feet thick, with few organic remains. 



The first stratum is of a yellowish colour, and without flints ; 

 it is also much harder than the chalk with few flints. Ammonites 

 also occur in this stratum. The second stratum of this deposit 

 rises at the base of Shakspeare's Cliff, on the side nearest to 

 Dover, and is separated from the preceding by a thin bed of soft 

 marl. This stratum is softer and whiter than the one above it, 

 though not so much so as the chalk with few flints. For six feet 

 below the bed of marl it is of a sandy and friable texture, assum- 

 ing sometimes the appearance and compactness of a sandstone. 



4. The grey chalk. This begins to rise on the west of 

 Shakspeare's Cliff, and is softer than the strata reposing on it ; 

 but it varies in colour and texture. It is separated from the 

 stratum just described by some very thin beds of a sandy ap- 

 pearance and yellowish colour, and contains, occasionally, beds 

 of sandstone, extremely hard, and from one to five inches in 

 thickness. No flints are visible in this bed : it contains many 

 organic remains not differing considerably from those of the 

 upper beds ; but the echini which are found in it are always 

 depressed and broken. Underneath the grey chalk, and near 



