Ardatian

The Ardatian Period was the final period of the Promesolithic Era, lasting from 270 to until 248 million years ago. It is named after the rocks of Ardat- specifically, the lower red beds of the Paleshi Formation in which the fossils of the synapsid species Edaphosaurus ummarnum are present.

It saw the rise of the first true reptiles, as well as a vast variety of various para-reptiles and synapsids, the latter of which would include the ancestors of mammals. The end of the Ardatian, however, saw a cataclysmic mass extinction marking the end of many of the synapsids and parareptiles, as well as the large griffinflies, trilobites, and many other invertebrates on land and in the sea.