[5] I am indebted to the kindness of T. Sopwith, Esq., for three models which I have copied in the above diagrams; but the beginner may find it by no means easy to understand such copies, although, if he were to examine and handle the originals, turning them about in different ways, he would at once comprehend their meaning, as well as the import of others far more complicated, which the same engineer has constructed to illustrate faults.
[6] Edward Hull, Quart. Geol. Journ., vol. xxiv, p. 324, 1868.
[7] Playfair, Illust. of Hutt. Theory, § 42.
[8] Geol. Trans., second series. vol. v, p. 452.
[9] Conybeare and Phillips Outlines, etc., p. 376.
[10] Phillips, Geology, Lardner’s Cyclop., p. 41.
[11] See Mammatt’s Geological Facts, etc., p. 90 and plate.
[12] Hull, Quart. Geol. Journ., vol. xxiv, p. 318, 1868.
[13] H. D. Rogers, Geol. of Pennsylvania, p. 897.
[14] Edward Hull, Quart. Geol. Journ., vol. xxiv, p. 323.