3/. The Survey Course - University College London

The site is situated on the crest of the E-W orientated downland escarpment,
overlooking the Weald to the north and the downland block and coastal plain to the
south (Fig. 7). The barrows and associated cross dykes sit on the highest part of the
ridge in this area, at heights between 225 and 230m OD. The terrain to the north of
the site, the scarp face, falls away steeply into the Weald, to the south the fall is
gentler and represents the bedrock dip of the eroded southern margin of the relict
anticlinorum.
Fig. 7. Contour model of the Heyshott/Graffham area showing the site undergoing
investigation.
The northern scarp slope is characterised by spurs of Chalk irregularly separated by
steep sided coombes. The southern slope contains the heads of many of the long
coombes which feed into the upper section of the Lavant Valley (Figs. 4-7). Drainage
in the present day is largely by percolation through the Chalk but at times of heavy
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