The Aber Eiddi industrial complex includes the St Brides Slate Quarries (NPRN 40620) linked to features at Porth-Gain (NPRN 33206) by a tramway (NPRN 400060). It is part of the wider Porthgain Industrial complex that also includes the headland at Penclegyr.

Sources include:
Driver, T. 2007. `Pembrokeshire, Historic Landscapes from the Air', RCAHMW, pages 110-111.

RCAHMW, February 2011.