In 1775,Nicolas Desmarest(1725-1815)presented an interpretation of geological evidence he had been examining for over a decade,among the extinct volcanoes of Auvergne in south-central France.He interpreted the volcani...In 1775,Nicolas Desmarest(1725-1815)presented an interpretation of geological evidence he had been examining for over a decade,among the extinct volcanoes of Auvergne in south-central France.He interpreted the volcanic remnants in that region in terms of three successive epochs,distinguished from one another by their degree of erosive alteration and the different topographic positions they held following extensive denudation.He insisted on the utility,for the establishment of sequential stages in the region’s history,of what he called his‘analytical method’of working backward in time,from recognition of the most recent and therefore least altered products.展开更多
文摘In 1775,Nicolas Desmarest(1725-1815)presented an interpretation of geological evidence he had been examining for over a decade,among the extinct volcanoes of Auvergne in south-central France.He interpreted the volcanic remnants in that region in terms of three successive epochs,distinguished from one another by their degree of erosive alteration and the different topographic positions they held following extensive denudation.He insisted on the utility,for the establishment of sequential stages in the region’s history,of what he called his‘analytical method’of working backward in time,from recognition of the most recent and therefore least altered products.
