The Ty'n Llwyn site is an interrupted ditch or segmented enclosure measuring approximately 33m from northeast to southwest by approximately 25m from northwest to southeast. It was discovered as a cropmark during RCAHMW aerial reconnaissance on 2 August 2005. The enclosure is a flattened oval, comprising at least 6 separate ditch sections with rounded terminals and gaps along the sides and at the corners. The site encloses a small standing stone, which may therefore be of prehistoric date, and may also be related to other stones nearby currently classed as boundary markers.

The farm of Ty'n-Llwyn is surrounded by a rough circle or oval setting of 6 standing stones and two mounds. The setting encloses a considerable area of approximately 750m diameter. The discovery of the interrupted ditch enclosure or plough-levelled barrow during RCAHMW aerial reconnaissance in 2005, with a (then unrecorded) standing stone on its summit, gave context to the stone. It seemed as likely to be a prehistoric ritual monument as a modern boundary stone.

A prehistoric date for the remaining stones in this 'setting' would be highly unusual given its size. However, their ascription to being modern boundary stones does not explain the occurrence of a mound and a complex barrow within the setting.

THE TY'N LLWYN STONES AND MOUNDS - summary

Stone - NPRN 406340 - PRN 39
Stone - NPRN 406341 - PRN 40
Stone - NPRN 406342 - PRN 41
Stone - NPRN 406344 - PRN 37
Stone - NPRN 406345 - No PRN
Mound - NPRN 406343 - PRN 791
Mound/Complex barrow - NPRN 403377
Stone surmounting mound/complex barrow - NPRN 403376

T. Driver, RCAHMW, 26 June 2007.