[46] Ibid, p. 479.
[47] Ibid, p. 483.
[48] “Introduction to Geology,” by Robert Bakewell, 5th ed., p. 179. 1838.
[49] For the opinions respecting the Stigmaria ficoides, see a Memoir on “The Formation of the Rocks in South Wales and South-Western England,” by Sir Henry T. De la Beche, F.R.S., in the “Memoirs of the Geological Survey of Great Britain,” vol. i., p. 149.
[50] See “Siluria,” p. 14. Philosophical Mag., 3rd series, vol. xix., p. 419.
[51] A. C. Ramsay, “On the Red Rocks of England.” Quart. Jour. Geol. Soc., vol. xxvii., p. 246.
[52] “Elements of Geology,” p. 456.
[53] “On the Red Rocks of England,” by A. C. Ramsay. Quart. Jour. Geol. Soc., vol. xxvii., p. 246.