Published online by Cambridge University Press: 01 May 2009
The theory of the gradual formation of overfolds and overfaults in a stratified system is thus developed by Professor Heim:—
Wherever a stratified rock series is subjected to the lateral horizontal thrust of the earth’s crust, a fold is originated. This fold consists of two opposed and symmetrical members, with more or less remote axes, viz. (Plate VIII. Fig. 1)
page 337 note 1 Heim, Mechanismus der Gebirgsbildung, Band I. pp. 220–223.Google Scholar
page 343 note 1 On the Origin of Slaty Cleavage, by Sorby, H. C., F.G.S., etc., Edinburgh New Philosophical Journal, 07, 1853.Google Scholar
page 343 note 2 Compare:— (a) Corrugations only-rugae continuous. Ramsay, Geol. N. Wales, 1881, p. 239, fig. 96. Geikie, Handbook Geology, 1882, p. 520, fig. 245. (b) Corrugation with diminished middle wall. Ramsay, Ibid. p. 231, figs. 78 and 79. Geikie, Ibid. 120, fig. 19. (c) Corrugation with dislocation planes (“contorted false bedding”). Geikie, Ibid. p. 479, fig. 189. Lyell's Students' Elements, ed. 1871, fig. 628. (d) Overfolding and faulting of rugæ. (e) Overthrust, Bonney, Quart. Journ. Geol. Soc. 1883, pl. 39, fig. 2.