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You will see the Sigillarias on the left-hand side of the coal-forest picture, having those curious tufts of leaves springing out of them at the top. Their stems make up a great deal of the coal, and the bark of their trunks is often found in the clays above, squeezed flat in lengths of 30, 60, or 70 feet.
Then a new forest would spring up, the ferns, Calamites, Lepidodendrons, and Sigillarias would gradually form another jungle, and many hundred of feet above the buried coal-bed b, a second bed of peat and vegetable matter would begin to accumulate to form the coal-bed a.
I have heard it said that, deep down in coal mines, certain of the workers have seen wondrous sights; that when they have been alone in a drift, they have heard the blowing of the wind and the rustling of leaves, and suddenly found themselves penned in on all sides by the naked trunks of enormous primitive trees, lepidodendrons, sigillarias, ferns, and other plants, that have shone out with phosphorescent grandeur amid the inky blackness of the subterranean ether.
These great trees, the Lepidodendrons, the Sigillarias, and the Calamites, together with large tree-ferns, are the chief plants that we know of in the coal-forests.
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