But the
author's observations seem sufficiently precise to warrant the
conclusion that he was right in believing the basaltic cap of the
Gwalior hill to be an outlying fragment of the vast Deccan trap
sheet. The relation between laterite and lithomarge is discussed in
p. 353 of the _Manual_, and the occurrence of laterite caps on the
highest ground of the country, at two places-near Gwalior, 'outside
of the trap area', is noticed (ibid. p. 356). These two places are at
Raipur hill, and on the Kaimur sandstone, about two miles to the
north-west. No doubt these two hills are outliers of the Central
India spread of laterite, which has been traced as far as Sipri,
about sixty miles south of the Raipur hill (Hacket, _Geology of
Gwalior and Vicinity_, in _Records of Geol. Survey of India_, vol.
iii, p. 41). The geology of Gwalior is also discussed in Mallet's
paper entitled 'Sketch of the Geology of Scindia's Territories'
(_Records_, vol. viii, p. 55). Neither writer refers to the basaltic
cap of Gwalior fort hill. For the refutation of the author's theory
of the subaqueous origin of the Deccan trap see notes Chapters 14,
note 13, and Chapter 17, note 3 _ante_.
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