Cisuralian

From Palaeos.org

The Cisuralian epoch, a period of well over 20 million years, was - as far as the terrestrial ecosystem went - a fairly stable period ruled over by a diverse selection of pelycosaurs, including the large sphenacodontid finbacks such as the carnivorous Dimetrodon, Ctenospondylus, and Secodontosaurus, all of which attained a lengths of up to 3 meters, as well as semi-aquatic ophiacodonts and the big temnospondyl Eryops and smaller eel-like anthracosaur Archeria. This was a biome strongly tied to water and to a plant-arthropod-fish food chain; Diadectes and Edaphosaurus were the only herbivores. In this respect it continued the pattern of the great Carboniferous coal swamps. The drier upland was inhabited by a different fauna, mostly smaller insectivores with the herbivorous caseids and proto-therapsid Tetraceratops as significant newcomers. Both in the uplands and the lowlands insects continued to represent an astonishing diversity of forms.

Stratigraphy

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