One of two bowl-shaped hollows, possibly surface quarries or natural features, have been variously described as being 45 metres, or perhaps 12 metres in diameter, and 1.2 metres deep, situated 140 metres from each other on Balthane (Abbey Demense).  They appeared to be 'ancient' and the nearest parallel is a series of bowl-shaped hollows on Dreemlang.


The hollows were visited by W.C. Cubbon on 12th May 1932. It is recorded that  'In 1944 (sic) the deep circular hollow south of Balthane farm buildings (SC 282697) was needlessly destroyed by the military authorities'. The site is now built over within the Freeport area.