A continuous sloping unreinforced concrete buttress encircles what remains. The platform between the implant and the abutment can be flat (buttress) or conical fit. The design is asymmetrical and features a sloping buttress and arch. It had a sloped nose and flying buttress B-pillars. Buttress threads are of a triangular shape. This earthen terrace and knoll serves as an additional buttress for the foundation. There are burr wood and buttress root formations in Andaman Padauk. Above the glenoid fossa is a raised area known as the supraglenoid buttress. Another Gothic structural feature employed at Durham is the flying buttress. Instead it climbs a buttress on the left side of the Diamir Face. The palpebral bones strongly stood out, forming an "antorbital buttress". It is best known for its imposing buttress roots. At the base of each buttress is an earthstone. Trunks can often be up to in diameter above the extensive buttress roots. Common thread types are Acme and buttress.