[36] Quart. Jour. Geol. Soc., vol. iii., p. 159.
[37] “The Flora and Fauna of the Silurian Period,” by John T. Bigsby, M.A., F.G.S. 4to, 1868.
[38] Ibid, p. vi.
[39] “Siluria,” p. 148.
[40] “On the Red Rocks of England,” by A. C. Ramsay. Quart. Jour. Geol. Soc., vol. xxvii., p. 243.
[41] “On the Red Rocks of England,” by A. C. Ramsay. Quart. Jour. Geol. Soc., vol. xxvii., p. 247.
[42] For fuller details on this subject, see J. B. Jukes’ “Manual of Geology,” 3rd ed., p. 762. Also, R. Etheridge, Quart. Journ. Geol. Soc., vol. 23, p. 251.
[43] Quart. Jour. Geol. Soc., vol. xxii., p. 129.
[44] “Elements of Geology,” p. 480.
[45] Ibid, p. 479.