[54] “The Physical Geography and Geology of Great Britain,” 2nd ed., p. 60.
[55] A. C. Ramsay, Quart. Jour. Geol. Soc., vol. 27, p. 191.
[56] See A. C. Ramsay, “On the Physical Relations of the New Red Marl, Rhætic Beds, and Lower Lias,” Quart. Jour. Geol. Soc., vol. 27, p. 189.
[57] Quart. Jour. Geol. Soc., vol. xx., p. 396.
[58] Ibid, vol. xvii., p. 483.
[59] Ibid, vol. xvi., p. 374.
[60] Ibid, vol. xx., p. 103.
[61] Lyell, “Elements of Geology,” p. 413.
[62] De la Beche’s “Geological Manual,” 3rd ed., p. 447.
[63] “Geological Manual,” by H. T. De la Beche, 3rd ed., p. 346.