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The eye socket was tall with a pointed lower end
7 short tons)
The serrations on the mesial carina of the tooth extend one half of the distance from tip to base of the crown
acting as a Rowland prism to divide light into its component parts while reinforcing certain wave lengths
Mazon Creek Fern P-MC-16-024 Triassic The eye socket was tallPecopteris 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
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