3 - Aberdaron to Porth Oer
Pen y Cil
Head to near the tip of Pen Y Cil.
Looking westward along the cliffs of Pen y Cil to Trwyn Bychestyn
Gabbro rocks at the top of the Cliff were intruded as Sills into sedimentary rocks of Ordovician age.
Ref: NW 663
Date: 08/04/2022
Location: SH 1575 2401
