84 
UPPER CHALK. 
flints are marked with regular stripes of yellow, 
bluish grey, and brown. This singular appearance 
extends into the substance of the chalk, but does 
not penetrate beyond the external crust of the 
flints : similar specimens sometimes occur in the 
pit in South-street. 
Clayton pit. This locality produces Inocerami, 
Nautili, Plagiostoma, Terebratulse, Marsupites, &c. 
Falmer. An excavation made on this side of 
the road, leading from the village, towards Bonner, 
is particularly interesting from the evident proofs 
it exliibits of the changes the strata have suffered 
since their original deposition. The pit is about 
twenty feet deep, and contains the following beds, 
beginning with the lowermost : — 
1. Chalk with horizontal layers of large flints, 
— 6 feet. 
2. Chalk much broken, containing interspersed 
flints, — 10 feet. 
3. OchraceoLis clay and flint pebbles, — from 2 
to 4 feet. 
From the upper part of the pit, several fissures 
of an irregular shape, and from three to six feet in 
diameter, extend through the broken chalk to the 
more solid beds beneath. Some of these cavities 
are of an inversely conical form, and others are 
nearly cylindrical. They are filled with ochraceous 
clay, rolled flints, and rounded masses of a conglo- 
merate, consisting of pebbles and fragments of 
clialk, held together by a ferruginous cement. An 
aj)])earance somewliat analogous is observable ou 
the north side of the clialk-hill on which the 
cliurcli of St. Jolin sub Ca.sfro, in Lewes, is situ- 
