2 A series of undated linear features show on air photographs.
A series of linear features of unknown date or function that are visible on aerial photographs. They lie 300m east of Grendon Wood.
2 Three sides of a possible trapezoidal enclosure show on aerial photographs.
3 Dating narrowed to between the Neolithic and the Romano British periods.
Enclosures and linear features that are visible as crop marks on aerial photographs. They may be prehistoric in date. They lie 380m southeast of Grendon Fields Farm.
2 Linear features forming enclosures show on aerial photographs. Possibly a field system.
Linear features of unknown date, which form enclosures, are visible on aerial photographs. The features lie 500m south of Grendon Fields Farm.