Class-book of Geology |
Contents
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Common terms and phrases
abundant accumulated acid augite basin beds bones bottom Brachiopods calcareous calcite carbonate of lime Carboniferous chapter characteristic chiefly clay containing corals Cretaceous crinoids crystalline crystals cycads decay deposits detritus Devonian earth earth's crust Eocene Europe evidence example extinct fauna feet thick fishes fissures fossils genera geological history geologist glacier globe gradually granite gravel ground gypsum iron Jurassic kinds known lakes land lava layers limestone living lower marine marls masses materials Mesozoic miles mineral matter Miocene molten mountains natural North occur Old Red Sandstone organic remains original Palĉozoic period Permian plants and animals Pliocene present preserved probably quartz rain records regions rivers salt sand schists sea-floor Section sediment sedimentary rocks shales sheets shells siliceous Silurian slopes soil solid sometimes species stone strata stratified stream structure substance surface terrestrial Tertiary tion trace Triassic upper valley various vegetation vent volcanic