Mazon Creek Fern P-MC-16-002 Damselfly The concretions are found in

The concretions are found in the Francis Creek Shale Member within the Carbondale Formation of the Kewanee Group

It has an elongate body and a head that has ventrally located

The detail is excellent and it has a very pleasing color

the acquisition of which is regarded as a key feature in the early evolution of crocodylian body plan and their aquatic adaptation

is much more similar to that of Diplodocus

Mazon Creek Fern P-MC-16-002 Damselfly The concretions are found inNeuropteris 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