These are mainly fine white, buff sands with local beds of flint-pebble
gravel. The full thickness probably does not exceed 40m. The Bagshot sands
are visible in the area immediately north of Chobham village; around
Burrowhill, Larkenshaw, Chobham Park, Gracious Pond, and all the way up to
Longcross. Elsewhere, in the river valleys, they lie under alluvial
material except at Focklesbrook which lies on an island of Bagshot sand.
The larger medieval farms appear to be centred on exposures of the Bagshot
The hollowed out pond area at Burrowhill was once a sand quarry. Bagshot Sand locally contains a 1 metre seam of exceedingly
fine sand, used for polishing.
Inhabitants of Killy Hill report that if they dig in their gardens they come
across fine almost-white sand. The Sand and Silica Mining Company at
Burrowhill, although on a lower Bracklesham bed, mined this fine sand.
Fossils are confined to pieces of lignite and plant fragments and a few casts
of marine gastropods.
These beds were laid down as alternate layers of sand and clay. The
lowest layer is of clay, usually laminated and lilac tinted but sometimes brown;
a middle division consisting of highly glauconitic sand, often deep green with
seams of variegated plastic clay; and the highest of sand, loam and clay, with
in places, a pebble-band at the base. The total thickness is from about 13
to 20 m.
The mix of clay and sand was once popular for brick making. Both the
former brickworks at Brick Hill and Titlarks Hill (south of Sunningdale) were
located in the Bracklesham Beds.
An ironstone band sometimes occurs at the junction with the Bagshot Beds and
along the upper Windle Brook. This may have been the source of ore for the
prehistoric iron industry in the upper Windle Brook.
The middle division occasionally contains fossils.
These are fine-grained, level-bedded, yellow sands, frequently marked off
from the strata below by a pebble-bed and with occasional loamy seams near the
top. The original thickness of this bed is at least 17m. The
presence of churt in the pebble-bed is of interest, as it indicates that the
denudation of the Weald had by then progressed so far as to uncover the Lower
A ridge of Barton sands runs from Chobham Place to Staple Hill.
Fossils are found only very occasionally and are marine.