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America Amphibians anthracite Appalachian region arenaceous argillaceous Azoic bituminous coal boniferous border Brachiopods Brngt calcareous Calciferous carbonic acid Carboniferous Carboniferous age Carboniferous period Chonetes coal beds coal fields Coal measures Coal period coal regions common conglomerate Conifers continent Corals Crinoids Dawson Devonian dry land east eastern England Epoch Europe extinct feet thick ferns ferous flexures folds formation fossils fresh-water genera genus gray Illinois impure inches Interior basin iron-ore Kentucky Labyrinthodonts Lacertians layers Lepidodendra Lepidodendron Lesley Lesquereux Lower Coal measures Lower Silurian Lsqx magnesian limestone marine marshes Millstone grit Mississippi Missouri Mollusks nearly Neuropteris Newberry North Nova Scotia occur Ohio oscillations Palaeozoic Pecopteris Pennsylvania Permian Pittsburg plants portion Potsdam Potsdam period Pottsville probably Productus rocks Rocky Mountains sandstone shales shaly Shumard Sigillaria siliceous species Sphenopteris Spirifer strata Tennessee Thecodont thin Trenton tribe Trilobites Upper Coal measures Upper Silurian vegetation Vertebrates Virginia waters western