Cropmarks visible on air photographs taken at Walton on Trent by Jim Pickering. These include, at SK 224194, cropmarks of two sides of a double ditched enclosure, and at SK 226193, cropmarks of three sides of a rectangular enclosure with other linear features. (1, 2) Nothing visible on O.S. air photographs taken in 1967. (3) Several cropmarks identified as part of the New National Forest Survey and mapped using good quality aerial photographs. These include: Probable cropmark enclosure of unknown prehistoric date seen as an asymmetric polygonal enclosure, 115m by ??m, defined by 1 ditch, with 3 sides visible and the rest masked by trees. Centred at SK 2259 1934 (5); Probable cropmark enclosure of unknown prehistoric date seen as a single linear feature defined by 2 ditches, with a maximum length of 150m. Centred at SK 22421941 (6); Probable cropmark field boundary of post medieval date seen as a single linear feature defined by 1 ditch, with a maximum length of 150m. Centred at SK 22311933 (7); Possible cropmark enclosure of unknown prehistoric date seen as an interrupted single linear feature defined by 1 ditch, with a maximum length of 80m. It is possible that this enclosure is the same as that in SMR entry 27502. Centred at SK 2232 1898 (8) Cropmarks plotted on map overlay at a scale of 1:10,000. (9) The double ditched enclosure has been interepreted as a possible Roman fort or marching camp. Between 43 and 48 AD, the Roman legionary army moved north and north-west from Colchester and the Thames. By 48 AD the Fosse Way was established as a frontier running from Exeter to Lincoln and beyond this line physical barriers, such as the Trent, formed an ideal forward line. It is therefore suggested that the Drakelow fort will have been constructed in the late 40s AD and occupied for a short period, certainly less than a decade. If the site proves to be a marching camp, then an even shorter period of occupation can be expected. The configuration of the cropmarks forming the possible fort suggest that the fort extends into the woodland forming the south-west boundary of the Power Station site. (10)