Abstract
In a recent number of the Records of the Geological Survey of India, vol. lxii, p. 410, Dr. Fermor has done me the honour to draw attention to a paper of mine (Geological Magazine, 1903, p. 305) in which I came to the conclusion that the thrust-plane at the base of the Himalayas must have, at its outcrop, a dip of about 14°; and he points out that this estimate agrees with the observations of Mr. Middlemiss in Jammu Province. My estimate was based upon a simple geometrical deduction which proceeds directly and inevitably from the assumption that the Himalayas rest upon a plane thrust-surface.

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