As mentioned in the text (see p. 29), a raised beach dating from the Third Interglacial (Riss-Würm) Period is found in Britain and Ireland south of a line shown on the map (Fig. 7, p. 58). In Ireland it extends from Achill Island, County Mayo (Wright, 1934, p. 34; 1937, p. 120), down the west coast (Wright, 1911, p. 98; Charlesworth, 1930, p. 364), along the entire southern coast, where it is especially clearly defined in County Cork (Wright and Muff, 1904, pp. 274-300), on the east coast (Martin, 1930, pp. 500- 6), in the Dublin area (Farrington, 1929, p. 169), and at Ardglass, Killough Bay, County Down (Charlesworth et al. 1935, p. 480; Martin, 1930). It is present in the Isle of Man (Wright, 1911, p. 98), Wales (George, 1932, p. 292; Jones, 1934, pp. 304—6), the south coast of England (Pengelly, 1867; Dewey, 1913; Jones, 1934, p. 307), with the exception of the Chalk region of Dover, and it appears again in Yorkshire (Wright, 1914, pp. 94 and 96). In the Channel Islands it is well marked, and at numerous localities along the coasts of Normandy and Brittany it has been identified (Wright, 1914, pp. 94—5), especially important sections existing in the vicinity of Calais (Day, 1866, p. III).

In the Gower Peninsula of Southern Wales there are two raised beaches older than Würm—the Neritoides beach and the Patella beach (George, 1932, p. 317). The latter is older and is associated with a cold fauna, whilst the former may be correlated with the bone deposits at Minchen Hole, which have yielded warm interglacial forms. The Neritoides beach is overlain by Old Drift, which indicates that its age is probably Third Interglacial, although it may be older. Certainly a Third Interglacial dating is suggested by the fauna of Minchen Hole (compare Wheeler, 1925, p. 18; B.R.G.[e], p. 109), as well as by the fact that the Gower Peninsula was ice-free during the period of the New Drift Glaciation (George, 1933, p. 208). On the opposite side of the Bristol Channel the counterpart of the Neritoides beach has been identified at several localities (Day, 1866[a], p. 116; Palmer, 1931, pp. 346-52; B.R.G.[c], p. 85). In the Severn and Avon Valleys terraces occur at heights cȯrresponding to these coastal marine platforms (Wills, 1938, pp. 232—3; Tomlinson, 1935, pp. 456—9).