Considering the inclusion of occasional local grey ware sherds within the fabric of the mound, perhaps from the (re)construction of the buildings in the rampart settlement during phase 2 of period 4 - constructed as 'scoops' within the ground surface - provided material for the mound? This would place the monument within the post-Roman period. There are few other finds, although this might be expected given the general 'poverty' of the site?
Any comments?