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Carboniferous System

the Carboniferous succeeds the old Red Sandstone or some other member of the Devonian system, and passes upward into the Permian series. Its constituent groups vary much in the thicknesses of their sandstones, clays, limestones, and coals in different parts of the world, according to their conditions of deposition in conterminous seas, estuaries, and lagoons.

Carboniferous fossils comprise labyrinthodont and other amphibia; heterocercal fishes of many forms; numerous insects, myriapods, and arachnids; crustaceans of all orders except the highest decapods; mollusks of all the known orders; polyzoa; corals of the "rugose" kind; foraminifera; and some plants of the conifer and cycad groups, but far more of the fern, equisetum, and lycopod orders.

The Carboniferous Limestone consists of corals, encrinites, shells, and foraminifera of a great sea, with muds, sands, CARD