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History of Geology

March 30, 1759: The Four Layers of Earth

In a letter dated to March 30, 1759 the Italian mining engineer Giovanni Arduino (1714-1795) proposed to the physician and fossil collector Prof. Antonio Vallisnieri the subdivision of earth's crust in various classes of rocks.Based on his observations along the foothills of the Alps, Arduino recognized a stratigraphic column with 4 classes: unstratified or poorly stratified rocks (or " Primary Rocks ", survived into the 20th century as " Paleozoic "), stratified rocks (" Secondary Rocks ", or " Mesozoic "), more recent, as yet unconsolidated, sediments (" Tertiary Rocks ") and as own category volcanic rocks...

March 30, 2013 — David Bressan

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