The site to be described was discovered by the writer in a newly cut ditch three miles south of Cambridge on the Hills Road (fig. I). It was revealed in section as a small pit, about 3 ft. across by 2 ft. deep, sunk into the chalk (fig. 2), and investigation showed that the major part of it had already been removed: when cleared the recess was found to extend in plan barely a foot from the face. The spot lies at about 60 ft. above O.D., and the ground rises very gently on three sides, but is level or slightly depressed towards the north-west. The sub-soil is the Lower Chalk, which at this point is overlain by about 8 in. of brown soil and the same depth of dark plough-soil.