CHALK MARL. 
155 
111 western Sussex it occupies the same relative 
position ; the lower chalk passing insensibly into the 
grey marl, and the latter into the malm rock. 
In its course through this tract of country, it 
forms a few hillocks or mounds of low elevation, 
wliicli are remarkable only for the abundance and 
variety of their fossil remains. I shall proceed to 
notice a few of the more interesting localities. 
A low bank at Middleham, in the parish of Ring- 
mer, near the seat of the Rev. J. Constable, con- 
tains hamiteSi turrilifeny naufilite.Sy ammoniteSy and 
mocerami. 
Stoneham, near Lewes. From a marl bank in a 
field adjoining the turnpike-gate, I have collected 
the same kinds of fossils as at Middleham ; also 
rodellaricPy auriculcPy scaphiteSy &c. 
Hamsey Marl Pits. The hillock, of which these 
pits present a vertical section, is insulated by the 
river Ouse. The quarries are situated to the 
north of the church, and are about 25 feet high. 
The strata are slightly inclined, and vary from a 
few inches to a foot or more in thickness ; the in- 
durated layers are separated by intervening seams 
of a soft loose marl, of a dark colour. The face of 
the rock is traversed by innumerable crevices, 
which, in some instances, are parallel with the stra- 
tification, and in others assume a vertical or trans- 
verse direction. 
The lowermost strata are of a bluisli grey colour, 
indicating a transition to the gait, into which the 
grey marl passes, at the depth of a few yards. These 
quarries contain sulphuret of iron, and spicular 
crystals of carbonate of lime ; the former often 
