Well beyond the main site, about 50m to the west of F. 153, another deeply buried pit, F. 37, was found cut into the top of the natural tufa deposit in Trench 5 (Fig. 3). The sides and base of this shallow pit showed some evidence of being burnt but the filling of grey clay loam with charcoal flecks produced no datable finds. The stratigraphic position of this isolated westerly feature suggests that it is of prehistoric date, although whether it is contemporary with the main pit group remains unclear.
   A trench cut by Barham and Bates in 1990 just west of the main site (Fig. 3) had revealed another, much larger pit, perhaps a quarry, cut into the natural tufa (Barham and Bates 1990, 101, fig. 28). This was about