 A tuff occurs within the Avill member on these eastern slopes at Keeper's Combe.The Cutcombe Slates form the ground immediately east of the Avill outcrop in this area whilst the Leighland Slates make up a band of higher ground between Cothelstone and Enmore with scattered outcrops extending north to Nether Stowey.Several limestone beds are named within the two upper members; oldest/lowermost first - the Rodhuish, Roadwater, Aisholt, Holwell and Leigh Barton limestones.