Note 16 — Chapter I · EARLY EARTHWORKS AND ROMAN STATIONS
Reading edition
At Pevensey the foundation of the wall is of chalk and flint, covered in one part by an upper layer of concrete, composed of flints bedded in mortar. Below the foundation is a layer of puddled clay, in which oak stakes were fixed vertically at intervals. See L. F. Salzmann, F.S.A., Excavations at Pevensey, 1906-7, in Sussex Archæol. Collections, vol. li.