Collected Papers On Some Controverted Questions of Geology
The book Collected Papers On Some Controverted Questions of Geology was written by author Joseph Prestwich Here you can read free online of Collected Papers On Some Controverted Questions of Geology book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Collected Papers On Some Controverted Questions of Geology a good or bad book?
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Where have we evidence in the latest of our mountain chains of the v] ON THE THICKNESS OF THE EARTH'S CRUST 151 existence of such masses ? Nowhere do the disturbed and tilted strata point to a mass more than a few miles thick. If the crust had the more excessive thickness suggested by Physicists and by some Geologists, we should have had mountains if not of greater height, at all events of greater breadth ; for if a solid plate of any kind be broken and the fractured edges turned up by reciproc...al pressure in presence of a resisting body beneath, the width of the protruding mass will bear a definite relation to the thickness of the plate. If, on the other hand, the plate is suf- ficiently pliable to yield without fracture and should be bent into folds, the height of the arches and the width across the folds will in like manner be propor- tionate to the thickness of the plate. Where have we evidence, even in the most recent of mountain chains, when the earth was approaching its present conditions of rigidity, of a shell of 700, or 500, or 100, or even of 50 miles thick ?
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