Note 23 — Chapter II
Reading edition
Mr. T. Mellard Reade, in an interesting paper (Nat. Science, iii, 1893, pp. 423-35) has argued against the view that these shells were carried up the hill of Moel Tryfaen by a glacier. See also, in support of the theory of a period of extensive submergence, Geol. Mag., 1893, pp. 35-7, 104-7; 1896, pp. 488-92; 1897, pp. 229-33.