In south-west London the lower terraces of the Thames of its west stop abruptly at a notable bluff cut into the London Clay against Richmond Hill. The higher ground across the east, save for the broad valley of the Wandle is capped across northern Wimbledon and the Norwood Ridge by Claygate Beds and older Thames gravels; the broad western part of this is dissected by the valley of Beverley Brook, which separates Richmond Park from Wimbledon Common.