File:Geological magazine (1914) (14577984658).jpg

Identifier: geologicalmagazi611914wood (find matches)
Title: Geological magazine
Year: 1864 (1860s)
Authors: Woodward, Henry, 1832-1921
Subjects: Geology
Publisher: London (etc.) Cambridge University Press
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Smithsonian Libraries

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, nor wliythe ice-stream which excavated Taylor Valley (the North Fork ofthe Discovery and Nimrod maps) did not remove the two projectingRiegeln. During my traverse of the then unexplored Ferrar Glacier, I, likeProfessor Gregory (Preface), found it difficult to determine which 190 Correspondence—H. T. Ferrar. features were due to denudation, glacial and preglacial, and whichwere due to valley formation by movements of the earths crust, andhence in my report described what I saw, but made no deductions.Now that I have gained further knowledge and experience I feel thatI can take up a definite position. I hold that the great transversevalleys of Central South Victoria Land were not entrenched by glacialerosion, but are disruption clefts due to the unequal foundering of theland, the lioyal Society Eange having stood firm as the surroundingcontinent subsided. I would go even a step further than Professor Gregory in denyingthe erosive power of ice as such. In the first place I agree with
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Sketch-map showing shove-lines of Ferrar Glacier and its branches aftera submergence of 3,000 feet. Professor Garwood and Dr. Harker that the corroding action ofa partially buoyed up glacier snout, which is thawing above water andmelting below, is small. In the second place I do not see howcorrosion by pot-holing (p. 407), the evidence for which is meagre, candeepen a valley indefinitely, for unless the water of the supraglacialcascade escapes as a subglacial stream helow the bed level of the valleya pool will be created and the water in it will form a cushion, and soset a limit to the process. In the third case spur-truncation seems tome to be brought about by the action of running water more than bythe rasping action of rock-charged ice. Between glacier side and Obituary—Sir John Murray. 191 valley wall a racing stream is usuallj to be seen, -which erodes bothice and rock. The stream cannot meander away from the valley-wall,for owing to the movement of the glacier the ice is renew

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