The monument includes about 50 large limestone blocks, quarried from a local site, which form an egg-shaped circle. There were probably 41–43 stones originally, but some are now in fragments. In the centre of the circle lie at least six smaller blocks known as the
cove, originally believed to have been set in a rectangle. The stones are surrounded by an earth bank, approximately at the outside edges and high, with an interior ditch about 2 metres deep and wide. There are two
causeway entrances breaching both the bank and ditch; a north-west entrance wide, and a south-east entrance wide. The inner bank encloses an area of . Few henge monuments in the British Isles are as well preserved. == Finds ==