This drystone shelter has been built into Bronze Age cairn, NPRN 303532, on the top of the Craig Twrch ridge. In 1987 in the Cadw Scheduled Monument description it was described as a circular drystone structure, 3 metres in diameter with walls up to 2 metres high, with some crenulation effect to the top on the north side. It was thought that it was a recent structure since it wasn't mentioned in earlier descriptions. The southeast side of this structure has since been pulled down and the shelter remodelled somewhat. J.J. Hall, Trysor, 28 March 2013