Monument record 0415800000 - C600M SE OF MAINSHILL FARM

Dimensions - Width 52m, Length 56m.
Plan Form - Square.
Depressed central area surrounded by bank, ditch & outer bank which extends NW from NW corner (B1).
No visble inlet from the river - would probably have been at SW corner (B1).
Seasonally waterfilled, moated fishpond (B3).
Perhaps the fishpond in Bulls Water Mead mentioned in 1623 with the fishing (B4).
Earthworks surveyed (B5).

A medieval and/or post medieval fishpond is visible on historic aerial photographs and remote sensing data as earthworks and was mapped as part of the Aylesbury Vale Aerial Investigation and Mapping project (EBC18604). Located in a field immediately adjacent the N facing bank of the River Thame about 590 metres SE from Mainshill Farm and centred at SP 75078 12412, a slightly rectangular ditch about 7 metres wide has a linear WSW facing side 47 metres long, a curving SSE facing side about 44 metres long, a linear ENE facing side about 44 metres long and a linear NNW facing side about 46 metres long. It encloses an internal area about 32 x 35 metres. Around the interior of the ditch is an earthwork bank that varies between 7 and 8 metres wide. On the outside of the rectangular ditch, earthwork banks 5-7 metres wide flank the WSW, NNW and ENE, but not the SSE side facing the river. From the NW corner, a curving ditch about 3 metres wide extends W for about 67 metres. On aerial photographs taken in 2023 and recent remote sensing data, the earthworks remain visible (6-10).