Traeth Llyfn rock ridges, Pembrokeshire

Traeth Llyfn is an attractive west-facing sandy beach on the north Pembrokeshire coast. The cliffs are mostly in the dark grey Aber Mawr Shale Formation (Ordovician), steeply dipping to vertically bedded, with a few thin tuff bands (volcanic ash bands). There are igneous intrusions at the north end of Traeth Llyfn: (a) a dolerite/gabbro sill which forms the un-named northern headland to the bay and (b) a thin dolerite sill just a bit to the south which is visible in the photo forming the greeny-buff rib and some of the rounded boulders in the immediate foreground.

Access to Traeth Llyfn is by boat or by a bracing walk along the cliff top path from Abereiddi Bay 3/4 of a mile away. There are no facilities here and no vehicular access. So it is very unspoiled.