A series of small trenches were excavated over a circular geophysical anomaly, east of the Blackmoor valley, Charterhouse, Somerset. The excavations did not detect any feature that corresponded with the geophysical anomaly but did coincidentally reveal a pit, suggested to date to the Mesolithic period. Over 200 unstratified struck lithics were also recovered, many of which date to the same period. The lithics are discussed and the absence of Roman activity in this part of the Charterhouse landscape noted.