Mazon Creek Fern P-MC-16-020 Carnivorous Dinosaur Here is a good example

Here is a good example of the winged seed of Ailanthus which is a close relative of the Tree of Heaven

chlorite and illite) are common and calcite abundance is greater than dolomite

This specimen has 3 serrations per millimeter

This is a nice example of the Crane Fly Tipula sp

This is a splendid specimen of the rare fossil leaf of Aristolochia

Mazon Creek Fern P-MC-16-020 Carnivorous Dinosaur Here is a good exampleNeuropteris sp. Carbondale Formation Middle Pennsylvanian Grundy County, Illinois One half of a 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