LOWER CHALK—BERKSHIRE. 
171 
The Belemnite Marl was just visible at the entrance to the pit 
at the top of Blowing Stone Hill. 
Small pits have been opened in the zone of H. subglobosus by Sin- 
combe Farm south of Childrey and by Childrey Warren Farm, and 
again in a held on the north side of Wantage Workhouse. 
_>’ood section through the beds at the top of the Lower Chalk 
is exposed in a quarry by Chalkhill Barn, one mile south of Lockinge ; 
A gi 
the face in 1887 showing 
Soil and rubble of hard chalk ----- 
{ Hard compact bedded chalk, somewhat nodular - - 
Hard rough nodular chalk, with greenish matter 
between the lumps ------ 
i •, ( Soft laminated argillaceous marl - 9 inches to 
e M e V e i Hard white compact chalk - - 6 inches to 
,! l Thin layers of marl, 3 or 4 inches - 
Mel bo ur n 
ft, 
4 
5 
Firm white blocky chalk 
seen for 20 
About - 34 
There is no hard-and-fast line between the blocky chalk and the 
marly layers at the base of the Belemnite band, which seem to occur 
as it were, in the upper few inches of this chalk. The upper marl 
band contained Ostrea vesicular is and a broken Actinocamax . 
The marls are seen again at two localities near Chilton, the first 
being in a small pit near Skeleton Farm, south-east of Chilton, where 
the central course of hard white chalk is about 18 inches thick ; 
• the second is in a quarry on Hagbourn Hill, north of Chilton, where 
the following section was exposed in 1887 : — " 
ft. 
Mel bourn Hock, broken and weathered- 
Lower 
Chalk. 
Buff-coloured laminated marl - - - - 0 -. 
Hard whitish chalk, some parts harder and whiter 
than the rest ------- 1 
Grey laminated chalk passing down into massive 
whitish chalk, seen for - - - - - 3 
The hard white chalk yielded Rhynchonella plicatilis , Ostrea 
vesicularis, and Aporrhais Mantelli (cast). 
In the railway cutting near Chilton,already described (see p. 168), 
about 20 feet of grey chalk are seen above the Totternhoe Stone, and 
these beds have yielded Holaster subglobosus and Discoidea cylin- 
drica. The base of the Totternhoe Stone is well marked, but there 
is no clear line between it and the overlying chalk, though planes 
of curvilinear jointing often pass through the top of the stone and 
make it appear to thin and thicken irregularly. 
The outcrop of the Totternhoe Stone was found again by the 
side of the road to Cholsey, half a mile south-east of Lollington Farm, 
and blocky grey chalk is seen in a pit on Lollington Hill, and also 
south of Aston Upthorpe. 
