A hint with respect to the origin of terraces in glaciated regions

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Abstract
THE exact method of formation of terraces in riyers flooded by the melting of the ice sheet, snch ri~e~'s for instance as the Connecticut, cloes not appeal' to be defimtely agreed upon by geologists.By SOllle they are supposed to lllark recent erosion in a drift-filled valley.That is, the supposition is that the glacially fed rivers ,vere overloaded and actually built lip tlleir beds to the height of the higher terraces, and in this exten' sive deposit the present ter)'aced valley has been carved.The other important theo),y is that the terraces mark high stages of floods-that they al'e flood plai'ls at various stages of flooding.It is not Illy purpose to enter into the subject in a critical manner and state the reasons 1)1'0 and con which have been advanced by the advocates of these theories, but, rather, to record some observations in an entirely different region where the terraces of glaciated regions are being imitated, and ,,-here the general conditions are quite similar to tllOse attending the formation of the terraces in glacial region!', as I understand those conditions.I refer to the valley of the Colorado ill Central Texas_The river is here superimposed upon a hard Silurian barrier which is effectually retarding its downcutting although the river is still well above base leve1.One of the effects of this retardation of development on the region upstream from the barrier is that a temporary base level is produced and the Colorado itself and the side stream are fOl' a certitin distance actually building up their beds.The effect of the barrier is thus felt for fOl'ty or fifty miles; but above thiR, the tlow is rapid and the river is degrading its channe1.Alollg the entire course the side streams are rapidly at work, and hom these two sources milch sedill1ent is being fUl'llishcd.Owing to the ll1any soft beels of Cretaceous, Permian and Carboniferous through which these streams are flowing the amount of sediment supply is very great.Another point of importance in this connection is the peculiarity of rainfall.The immediate region is sn b-humid, the extreme head ",atel'S are in a truly arid region.Consequently, the water supply, dlll'ing a gl'eat part of the year. is small in amount i but heavy rains, wllich are of annnal OCCUlTence, and often of greatOl' f'l'equency, bring to the river vast floods of water which the ordinary channel is totally unable to hold.Almost the entire rainfall has to be carried off; for the barren soil holds bllt little, and the violence of the min speedily forms
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Authors R. S. Tarr
Journal american journal of science
Year 1892
DOI
10.2475/ajs.s3-44.259.59
URL
https://ajsonline.org/article/65496.pdf
Keywords Keywords not found

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