LOWER CHALK—SOUTH WILTSHIRE. 
151 
road cutting south of the pit shows several feet of hard glauconitic 
chalk, much resembling mortar, passing up into softer chalk with 
little glauconite. 
No exposure of the base of the Chalk was seen at West bury, but 
there are several at Bratton, Tinhead, and Earlstoke. Thus a road¬ 
cutting near Combe Farm, Bratton, shows the following beds, for 
the description of which I am indebted to Mr. W. H. Bell, F.G-.S. 
ft. 
Rather hard light-grey marly chalk, with Am. [ Schloenh .] 
varians , softer and darker below.10 
Band of harder chalk - .- -- -- -2 
Soft dark grey marl with patches of green grains 1 
Glauconitic marl, sandy at the base 2 
Greensand below. 
A similar section, but exposing more of the sands below, is exposed 
in the quarry south of Tinhead, the Chloritic Marl being only 2 feet 
thick and containing only a few scattered phosphatic nodules. 
Compared with its development near Warminster it is much reduced 
in thickness, and forms a more distinct and separate bed, although 
there is no definite plane of separation at its base. Fossils also are 
scarce in this district. 
Chalk Marl. —A good exposure of the alternating beds of soft 
marl and hard chalk forming the upper part of the Am. varians 
zone occurs in the chalk-pits by the side of the road leading up 
Buxbury Hill, on the south side of the Yale of Wardour, and is seen 
in the lowest level leading to the door of the lime-kiln, the descending 
succession being as follows : — 
ft. in. 
Two courses of hard rough grey chalk separated by 
loose marly chalk -. --26 
Bark grey argillaceous marl ------06 
Loose grey marly chalk - - - - - -13 
Hard grey chalk - - - - from 9 inches to 16 
Marly grey chalk, weathering into loose fragments, with 
here and there patches of darker bluish-grey chalk 
(many fossils) -------- - 14 0 
Very hard rocky grey chalk, rising from below the last 
near the entrance. 1 6 
Bark grey tough marly chalk - seen for 10 
22 3 
These beds have a southerly dip of 4°, and contain many of the 
characteristic fossils of the Chalk Marl, such as Rhynchonella Martini, 
Rh. grasiana, Lima globosa , L. aspera , Am. [Schl.] varians , etc. 
A quarry to the south-east of the village of Fovant shows a similar 
set of beds, which must be at about the same horizon. The upper 
part of the quarry is in firm, massive whitish chalk, of which about 
50 feet is seen, and below this the following succession can be made 
out: — 
