Phillips, J: Treatise on Geology, Vol. 2 (Classic Reprint)

Anglický jazyk

Phillips, J: Treatise on Geology, Vol. 2 (Classic Reprint)

Vydavateľstvo: Forgotten Books
Formát: Paperback
Jazyk: Anglický jazyk
ISBN: 9781333048846

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O knihe

Excerpt from A Treatise on Geology, Vol. 2

WE now quit the marine deposits Of tertiary and post tertiary age, and fix our attention on a parallel series of accumulations, in valleys, and ancient lakes, for the most part under the in¿uence of fresh waters. In treating of formations in valleys, we cannot always con fine our illustrations to the Operations of fresh waters, because continued research appears, in several instances, to show that what appeared at first to be due to laws trine ¿uctuation or river currents was really the effect of water-movement in an ancient arm of the sea. This result is quite to be expected. Valleys have been the channels of strong sea currents before they were raised above the ocean and filled with precipitations from the air: valleys were subaqueous before they became sub aérial, and in them we ought to find marks of marine followed by other marks of ¿uviatile action.

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