Caption:
This early Permian scene of the Paleozoic era (280-230 million years ago) featured a semi-aquatic swamp forest landscape of calamites (horsetails), seed ferns, scaled trees (lycopsids), and tall club mosses (sigillaria and lepidodendron). Eryops, a primitive amphibian (foreground), and the Edaphosaurus, a large reptile with a unique sail on its back, were prominent land species.