Notices and Extracts from the Minutes of the Geological Society. 335 



the form of irregular veins and masses^ in a sort of chalk marl of a dirty white 

 colour^ which includes nodules of a harder substance than the rest, and con- 

 tains a great number of shells, among which a species of plagiostoma was the 

 most abundant. Immediately after this, the Folkstone blue marl (gault) 

 appears in a low bank along the shore, at the extremity of a valley, which 

 here opens towards the sea ; the valley itself being formed on one side by 

 the chalk hills, which rise to the height of nearly 600 feet, and on the 

 other by a range of low hillocks of marl and sandstone, beyond which stands 

 the town of Folkstone. 



The real position of the strata at this place is much concealed by the sub- 

 sidence of the various argillaceous beds of chalk and marl ; but after crossing 

 the under-cliff in various directions, I was enabled to trace the following suc- 

 cession : — 



1st. White chalk. 

 2nd. Gray chalk. 

 3rd. a) Sand containing green particles, and indistinct organic remains. 



b) Marl of a dirty white colour, much mixed with the preceding sand. This bed contains 

 nodules of a more compact texture, and abounds with fossils, though from the soft 

 nature of the marl, their characters are not determinable ; — and it is from hence that 

 the subsided masses already mentioned have come. 

 4th. The blue marl of Folkstone (gault), containing petrifactions in great variety. The 

 hamites, inoceramus, a particular species of ammonite, and, above all, a small belemnite 

 are characteristic of this bed. 

 5th. In fine, thick beds of sand and sandstone full of green particles, and of very coarse texture. 

 I perceived no organic remains in this bed, but could not search for them minutely. 



What I have mentioned sufficiently shows, that the Folkstone clay (or 

 gault) is separated from the marly beds of chalk by a stratum of sand and 

 argillaceous marl, abounding in green particles ; and is on the other hand 

 itself succeeded, in descending, by the sand and stone also abounding in 

 green particles, which occupy the shore at Folkstone. 



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