1. The raised beach near Porth Clais consists of shingle and large wave-worn boulders resting on a rock-platform, and overlain by angular head or rubble of local rocks. 2. Glacial drift (Boulder-clay) overlies the head at the western end of the section, and towards the east has ploughed into the raised beach and rests on the solid rock. Some of the boulders of the raised beach and a small piece of the rock-platform are definitely striated under the Glacial drift. 3. The raised beach is pre-Glacial in the sense that it underlies the Glacial deposit. 4. The raised beach contains non-local boulders which may have been transported by drifting shore-ice.