The exact and exhaustive study of the Quaternary terraces of the Somme, which we owe to Commont, may well serve as a starting point in any consideration of this subject. In its results it is not without its surprises, for we should scarcely expect to find, as we do, that the gravels which form the earliest deposits on each of the three lower terraces all contain the remains of a “warm” fauna; the third or highest of these terraces affording Elephas meridionalis, the first and second E. antiquus and its companion Hippopotamus. Associated with these faunas are flint implements of early types. Pre-Chelléan in the third terrace, typical Chelléan in the second, and Chelléan “evolué” in the first. No signs of a cold climate are to be discovered in any of these gravels until we reach that of the first terrace, where a newer gravel is to be seen invading the older and bringing with it Acheuléan implements and the mammoth.
page 1 note 1 Ancient Hunters, 2nd ed., 1915, p. 123.Google Scholar
page 2 note 1 Lamothe, General, “Les anciennes lignes de rivage du bassin de la Somme”: Comptes Bendus, clxii, 1916, p. 248Google Scholar, and Lamothe, General, “Les anciennes lignes de rivage du bassin de la Somme” C. R. Soc. geol. de Fr., 18th 01, 1918, p. 26Google Scholar. ProfessorDepéret, , “Essai de co-ordination chronologique des temps Quaternaires”: Comptes Rendus, clxxvi, 1918, pp. 480, 636, 834; clxvii, 1918, pp. 418, 979; clxviii, 1919, p. 868; clxx, 1920, pp. 159, 212; clxxiv, 1922, pp. 1502, 1594.Google Scholar
page 5 note 1 This and not the Riss is said to mark the maximum glaciation; the Riss only exceeds the Mindel in the region of the Rhine glacier, and not always there.
page 6 note 1 Mayet, Lueien, Comptes Rendus Assoc. Française pour l'Avancement des Sciences, Congrès de Strassbourg, 1920, p. 481 et seq.Google Scholar
page 6 note 2 Ibid., Enseignment de l'année 1919–20 à la Faculté des Sciences de Lyon.