Is located 1.7km north, north west of Birds Rock Trig. It is 50 metres wide, 50 metres high and 30 metres deep. The back wall has an outline of a near perfect cupola and a large fallen rock is centrally disposed and elevated. The floor has a rake of about 30 degrees, is sandy and has areas of duricrust, a secondary product of weathering. Named by Yuri Bolotin on a Bush Club walk, 26th November 2012.