Shallow basin and groove that follows a vein in the rock and runs down the floor of the shelter to part where Stan Beckensall excavated a cremation burial in a food vessel of c.2000 BC. Stan describes the groove as having been pecked with a hard stone tool. The basin has been roughened possibly to hold a wooden upright (other metal-cut post holes are present) and the gutter may have been originally cut as a drainage channel.
Image credit: Rockandy