1. At approximately the NE corner of the small island of Ynys y Fydlyn is oval hollow with a slight bank clearly outlined in the deep grass cover on this virtually ungrazed island. No stone visible save within a rabbit burrow at one side of the site. Possibly the remains of an Iron Age hut circle. Dimensions about 4m x 5m and about 0.4m deep.

John Latham RCAHMW 8 August 2017

2. The hut circle, along with other sites at Carmel Head, has been monitored as part of the CHERISH project, due to being at risk from natural processes exacerbated by climate change. CHERISH (Climate, Heritage and Environments of Reefs, Islands and Headlands) is an EU-funded Wales-Ireland project (2017-2022) led by the Royal Commission on the Ancient and Historical Monuments of Wales, in partnership with the Discovery Programme: Centre for Archaeology and Innovation Ireland, Aberystwyth University: Department of Geography and Earth Sciences and Geological Survey, Ireland. Work included aerial survey in 2016 and photographic survey in 2018.

H. Genders Boyd, CHERISH, April 2022

3. Visited by Toby Driver and Louise Barker for the Royal Commission, 17th Sept 2024.

The visit revealed there is good evidence for a well-settled interior on this western islet. In addition to the one roundhouse, a number of house platforms were observed.  

The roundhouse survives as a 5m-round (or slightly oval) low turf-covered walled building with an east facing doorway. Although it could be prehistoric, it appears to be distinctly different and better preserved than the surrounding house platforms.

See main Promontory Fort record (NPRN 54410) for the full description.

Toby Driver and Louise Barker, RCAHMW, 11 October 2024.