MIDDLE CHALK—WILTSHIRE. 
455 
The hard nodular chalk of the Melbourn Rock can be seen in 
the roadway ascending Cleeve Hill, south of Charlton, and the Tere- 
bratulina zone was observed by Prof. Barrois in several quarries 
north of Enford which expose the usual massive white chalk, 
with thin layers of marl, and he obtained G-alerites subrotundus and 
Inoceramus Brongniarti. (Reclierches, p. 53.) 
A good section of the Melbourn Rock is exposed in a quarry halt- 
a-mile north-east of Wooton Rivers, south of Marlborough, and I 
am indebted to Mr. F. J. Bennett for the following account of it 
feet. 
Hard cream-coioured nodular chalk, one bed near the base 
being specially hard and nodular (Melbourn Rock), about - 12 
Soft yellowish marl - - - - ----- - x 
Hard nodular chalk- -.- 1 
Greyish chalk touched below. 
The beds have a dip of 28° to the north. The yellowish marl and 
hard chalk below it may also be part of the Melbourn Rock. 
North of Devizes, the central part of the Rhynch. Cuvieri zone 
is quarried on Windmill Knowl, the pit being about 20 feet deep, 
showing thick beds of hard whitish chalk with seams and streaks of 
greenish grey marl; Inoceramus mytiloides is the prevalent fossil. 
The weathered top of the Melbourn Rock is exposed in shallow 
pits on the north side of the plantation on Roundway Hill, and its 
outcrop can be traced all round the top of King’s Play Hill, as well 
as round the larger outliers which rise into Morgan's Hill and Old¬ 
bury Castle south and east of Calstone. 
The T erebratulina zone is quarried on the western slope of Old¬ 
bury Hill, the pit exposing about 20 feet of massive white chalk, 
which is carted down to Calstone for the manufacture of whiting. 
My colleague, Mr. F. J. Bennett, informs me that, notwithstand¬ 
ing the extent of ground covered by this zone in the country to the 
east and west of the Marlborough Downs, the beds are only seen 
here and there, and no very good sections are exposed. 
Along the line of the Swindon and Marlborough railway the Mel¬ 
bourn Rock appears to be faulted down against Lower Chalk near 
Whitefield Farm, so that its outcrop is not traversed by the railway. 
In the cutting north of Ogbourne Station Mr. Bennett found hard 
chalk at the northern end overlain southward by 15 feet of firm 
white chalk, somewhat weathered and rubbly. This probably 
belongs to the upper part of the Rh. Cuvieri zone. 
