Mazon Creek Fern P-MC-16-012 Lower Cretaceous Both wings are present

Both wings are present

8 cm long and 1

The original specimen is estimated to be 5

This unidentified leaf has well defined palmate venation

The ribs tend to bifurcate but remain fairly straight and are prominent

Mazon Creek Fern P-MC-16-012 Lower Cretaceous Both wings are presentPecopteris sp. Carbondale Formation Middle Pennsylvanian Grundy County, Illinois Complete siderite nodule with a very well preserved fern frond. The Mazon Creek area fossils are found mostly in siderite concretions. The concretions are found in the Francis Creek Shale Member within the Carbondale Formation of the Kewanee Group. The best nodules are a by product of coal strip mining operations. The age of the fossil plants is Desmoinesian, Middle