Although the headland, when viewed from across the Teifi estuary, is relatively unspectacular, its cliffs, which are most dramatic on its north-western side, and reach over 575 ft (175m) in height, are the highest in Pembrokeshire. This makes the bays below the cliff tops largely inaccessible. The bedrock is composed of
Silurian and (mostly)
Ordovician sedimentary rocks, more specifically of
Llanvirn-Caradoc black
mudstone, i.e. some 470 million years old. This rock stretches southwest as far as
Newport, but Cemaes Head lies north of the
Ceibwr Bay Fault, which runs largely WSW – ENE from
Ceibwr Bay to
Cardigan. These rocks are severely twisted and buckled, with even acute folds, a feature easily seen from the clifftops, though appreciated better from the sea. The soft composition of these sedimentary rocks also means that
erosion by the sea through hydraulic action, abrasion and attrition is commonplace, and they are thus largely unsuitable for climbing. In 1840, George Nicholson in ''The Cambrian Traveller's Guide, and Pocket Companion'', wrote : The highest part of the headland, at Pengarn (189m / 620 ft), grid reference SN 13214 48500, is marked by a pillar
trig point (ref. 2097). On the western side of the headland, at the foot of the cliffs, is a stony beach area called Traeth Godir Coch which is exposed at low water. The western side of the headland is exposed to the full force of the south-westerly Atlantic weather; the eastern side is sheltered. The whole headland to the north of the hamlet of Cippyn is a distinctive area; there is an absence of trees and to some extent hedges; fields have stony boundary banks; properties are small, and there is a general absence of modern development. ==Nature reserve==