A bedrock depression revealed during construction work, together with its sedimentary infill, is described. It is concluded that the depression is probably a small fossil swallet cave system, infilled with sediments which are fluvial at the base, overlain by solifluction and loessic head. In a discussion of the wider regional geomorphology it is suggested that the site described was on an early high level valley route from the Old Red Sandstone in the north, towards the Severn-Wye system. This route had been substantially dissected by river captures and the drainage has now been captured by the Otter Hole cave system.