"archaeothyris" lived in what is now nova scotia, about 306 million years ago in the carboniferous period (pennsylvanian). nova scotia at this time was a swamp, similar to today's everglades in florida. the 'trees' (actually giant clubmosses) were very tall. some, such as "lepidodendron", were up to tall. "archaeothyris" and the other early amniotes lived on the forest floor.