Site info from Pastscape:
“South of Penning Barn – Avebury 18; bowl barrow, 33 paces by
9 ft. (2)
A well preserved grass covered bowl barrow, slightly oval;
diameter 39.0m E-W, 34.0m N-S, height 2.7m. Signs of disturbance
are visible on top, and the E perimeter is partially cut-back.”