3/. The Survey Course - University College London

Fig. 3c. Detail from the 1978 25inch sheet.
The barrow cemetery and dykes on Heyshott Down are located within the Parish of
Heyshott, some 12km NNE of Chichester, the county town of West Sussex (Figs. 1,
4), and 20km north of the current coastline of the English Channel at Aldwick, west of
Bognor Regis.
The site is situated on the Seaford and Lewes Nodular Chalk Members (LNCM),
producing a thin Brown Rendzina soil (343i), which constitute part of the eroded
Cretaceous Chalk surface of the southern limb of the Weald-Artois Anticlinorum (Fig.
4). On this part of the downland block, known as the South Downs, the solid geology
comprises the Upper and Middle Chalk Formations of the Chalk Group that, with
minor structural exceptions, young and dip southwards towards the downland dip
slope (Aldiss 2002). In the scarp slope face below the LNCM, the basal member of
the Upper Chalk, the full range of the Middle and Lower Chalk can be seen in a
downward aging sequence. At the base of the scarp the older deposits of the Upper
Greensand Formation, Gault Formation and Lower Greensand Group exhibit a
parallel disposition to the scarp face (Fig. 4). Younger deposits overlying the Chalk
are the reworked Palaeogene cover known as “Clay-with-flints”; valley sediments
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