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IV.—Essays in Theoretical Geology
Published online by Cambridge University Press: 01 May 2009
Extract
I have already shown that the northern boundary of the Indo-Gangetic alluvium is a structural one, and that the rock area immediately to the north of it has been elevated, while the nature of the boundary on the south, the deep imbayments of the alluvium, the gentle manner in which the older rocks slip under it, and the inliers, alike show that, on the south, the alluvium has gradually encroached on the rock area by the subsidence of the latter.
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References
page 71 note 1 For detailed section see Rec. Geol. Surv. Ind. vol. xiv. p. 221 (1881);Google Scholar Calc. Journ. Nat. Hist. vol. i. p. 324 (1841).Google Scholar
page 71 note 2 Rec. Geol. Surv. Ind. vol. xiv. p. 233.Google Scholar
page 72 note 1 On a former occasion (Rec. Geol. Surv. Ind. vol. xviii. p. 118Google Scholar) I was misunderstood when urging this argument; it was pointed out that Umballa is peculiarly situated in an area which receives no coarse deposit; that, at an equal distance from the foot of the hills, large boulders were found in the foundations of the railway bridge over the Jumna; and it was urged that the section was consequently irrelevant. Owing to this I must here point out that the argument is by no means affected by the greater or less average coarseness of texture of the deposits on other sections, as it only claims that ou any individual section near the northern limit of the plains the beds near the surface will, on the average, have a greater coarseness of texture than those which underlie them.
page 72 note 2 For detailed section see Rec. Geol. Surv. Ind. vol. xviii. p. 121.Google Scholar
page 73 note 1 Physics of the Earth's Crust, second edition, pp. 183–184.Google Scholar