| http://www.w3.org/ns/prov#value | - The Ancient Life History of the Earth Sphenopteris, &c.), whilst others belong to the gigantic group of the ???Tree???ferns??? (Psaronius, Caulopteris, &c.) Besides these there is an abundant development of the singular extinct types of the Lepidodendroids, the Sigillarioids, and the Calamites, all of which attained their maximum in the Carboniferous.
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