That's why I asked "My understanding was that turf and topsoil was removed (to what extent I don't know , but it would be good to get an estimate ) then a small gravel mound a metre high and 10m in diameter was built , two other smaller mounds , one of which was connected to the lmain mound by a gully a few metres away may have been contemporaneous ,the mounds were added to then building stopped for a while ,mound building continued with the earlier mounds being sealed under various layers then the bank and ditch was built . Has there beeen a change to the interpretation or any dates associated with this ?"