[74] Ibid, p. 391.
[75] “Elements of Geology,” p. 349.
[76] Ibid, p. 350.
[77] “The Physical Geology and Geography of Great Britain,” by A. C. Ramsay, F.R.S., p. 64.
[78] Lyell’s “Elements of Geology,” p. 349.
[79] Ibid, p. 340.
[80] Lyell’s “Elements of Geology,” p. 333.