MIDDLE CHALK —WILTSHIRE. 
453 
indebted for the particulars given below and for samples which 
enabled me to identify the Chalk Rock and the Melbourn Rock 
feet. 
/Soft but lumpy chalk with a few scattered flints 48 
Upper | Chalk lumps in soft chalk with some layers of flints 36 
Chalk. | Beds of solid chalk - - - - - 12 
tChalk Rock-Hard rocky chalk in three beds - 8 
vr.n, (Solid soft chalk with flints at two levels - - 42 
p/ n e j Solid chalk without flints, harder below - - 29 
" (.Hard chalk, partly very hard (Melbourn Rock)- 81- 
Lower / Firm chalk - - - - - - - -19 
Chalk. I Marly chalk with plenty of water near bottom - 82 
Mr. J. Scanes, of Maiden Bradley, informs me that between 
that place and Mere the thickness of the Middle Chalk appeal’s to 
be less than 60 feet, so far as can be judged from the levels at 
which the two rock-beds crop out cn the hill-slopes. 
The hills east of Warminster, which are crowned by Battles- 
bury and Scratchbury Camps, and Cotley Hill near Heytes- 
bury, are all outliers of Middle Chalk ; the Melbourn Rock is ex¬ 
posed in a small pit to the south of Scratchbury Hill. The 
main outcrop passes behind these hills, and the outcrop of the 
Melbourn Rock has been traced in and out of the numerous 
combes and valleys which trench the great plateau of the Chalk. 
From near Heytesbury this rock has been mapped along each 
side, of the valley of the Wily as far as the village of Wily and the 
hamlet of Deptford, where it passes beneath , the river-alluvium. 
Mr. F. J. Bennett informs me that the rock is seldom well exposed 
in the Wily Valley, but he saw exposures of it in an old lane south 
of Boyton, and again south of Sherrington in an old trackway lead¬ 
ing eastward. Hard-bedded chalk which probably belongs to the 
zone of Rhynchonella Guvieri is to be seen in the road cutting at 
Deptford and in a chalk-pit by Deptford Field Barn. 
A good section of nearly the whole of the Middle Chalk is exposed 
in the large quarries on Arn Hill, north-east of Warminster. This 
section, measured in 1899, was as follows 
feet. 
Zone of 
Hoi. 
planus. 
Zone of 
Terebratu- 
lina. 
Zone of 
Rhynch. 
Cuvier i. 
(Lumpy or nodular white chalk, inaccessible, but 
having a clearly-marked base line - about 
/ Chalk rock with three layers of green-coated 
| nodules and some scattered flints, passing down 
into hard nodular white chalk - 
/Clean white chalk, in thick beds - - about 
White chalk between two lines of flint nodules 
/ Firm white chalk in beds 2 or 3 feet thick, with 
^ marly partings ; a few scattered flints in the 
upper part ------ about 
/Firm white chalk, becoming harder below, and 
passing into hard chalk with much Inoceramus 
i shell ------ about 
j Very hard white nodular chalk (top of the 
( Melbourn Rock) - - seen for 
15 
°2 
12 
I 1 
35 
30 
1 
About 98 
4219. 
gg2 
