[18] Skeats, op. cit., [ref. 15], p. 135.
[19] J. J. H. Teall, "On dedolomitisation," Geol. Mag. (1891). 513, and Rep. Brit. Assoc. (1903).
[20] J. S. Howe, "Geology of Building Stones" (1910), 353.
[21] Hinde, "On Beds of Sponge remains in the south of England," Phil. Trans. (1885), Pt. 2, 427.
[22] Sollas, "On the structure of the genus Catagma," Ann. and Mag. Nat. Hist., Ser. 5, 2 (1878), 361. Also ibid., 6 (1880), 447.
[23] Cayeux, "Étude micrographique des Terrains sédimentaires," Mém. Soc. Géol. du Nord., 4 (1897), 443.
[24] Jukes-Browne, "The amount of disseminated silica in the Chalk in relation to flints," Geol. Mag. (1893), 545.
[25] Guppy, "Observations of a Naturalist in the Pacific: Vanua Levu" (1903), chap. xxv.
[26] Rogers, op. cit., [ref. 5], p. 403.
[27] Judd, "On the unmaking of Flints," Proc. Geol. Assoc., 10 (1887), 217. Also Hintze, "Handbuch der Mineralogie," 1 (1906), 1473.