On the Evidences of a Submergence of Western Europe, and of the Mediterranean Coasts, at the Close of the Glacial or So-Called Post-Glacial Period, and Immediately Preceding the Neolithic or Recent Period . a\ Rubble-drift, composed of granitic and diorite debris in a brick-earth or Loess, covered by a sandy earth and Raised beach—only portions of this remain. The phenomena, however, are readily explicable on the assumption that, as with thehead at Brighton and Sangatte, the driving force was that of a superincumbent bodyof water, flowing outwards. As at Sangatte, the forcible impact o
On the Evidences of a Submergence of Western Europe, and of the Mediterranean Coasts, at the Close of the Glacial or So-Called Post-Glacial Period, and Immediately Preceding the Neolithic or Recent Period . a\ Rubble-drift, composed of granitic and diorite debris in a brick-earth or Loess, covered by a sandy earth and Raised beach—only portions of this remain. The phenomena, however, are readily explicable on the assumption that, as with thehead at Brighton and Sangatte, the driving force was that of a superincumbent bodyof water, flowing outwards. As at Sangatte, the forcible impact of the head on thebeach has led to the incorporation of fragments of the beach in the head. Alderney.—I did not visit this island, but an unpublished section, taken many years Fig. 10.—Section on the Coast of Alderney (De La Condamine).. d, Rubble-drift or Head; c, Raised Beach. No description is attached to Mr. De La Condamines sketch,but this drawing, compared with his other drawings, leaves me in no doubt of its meaning. Therubble seems partly consolidated. 918 PROFESSOR J. PRESTWTCH ON THE EVIDENCES OF A SUBMERGENCE ago by the Eev. H. M. De La Condamine, gives what seems to me a very correctrepresentation of a rubble-drift on a slope, covering the remnants of a raised beach. We have seen that after the deposition of the angular rubble the land on ourWestern Coasts was left considerably above the level at which it now stands, sothat the land area was much enlarged. Such likewise appears to have been the casewith the Channel Islands, which are fringed by submerged forests, like those rootedon the rubble-drift of Devon and Cornwall. On this surface, flint flakes andNeolithic implements, together with the remains of Deer, &c, are found, but notraces of Paleolithic Man have been discovered on or around the Islands.
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