The shore at Clevedon is a mixture of pebbled beaches and low rocky cliffs, with the old harbour at the western edge of the town at the mouth of the Land Yeo river. It is remembered as the place where John Ashley conceived of the idea for The Mission to Seafarers. The rocky beach has been designated as the Clevedon Shore geological Site of Special Scientific Interest. It is the side of a mineralised fault running east–west adjacent to the pier and forms a small cliff feature in Dolomitic Conglomerate on the north side of Clevedon Beach, containing cream to pink baryte along with sulphides. Minerals identified include haematite, chalcopyrite, tennantite, galena, tetrahedrite, bornite, pyrite, marcasite, enargite and sphalerite. Secondary alteration of this has produced idaite, Covellite and other Copper sulphides.