The round circles with thin pointed leaflets radiating outward are a form of calamites foliage.
Larry pried off the part of this rock containing the lepidodendron fossil, and found this mass of ferns on the back.
Ferns, stems, and a few individual leaves.
The Lepidodendron, also known as the scale tree, is related to the club mosses, and could reach a height of 100 feet.