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This specimen is very good quality for the locality and is prepared on matrix
The seed core is visible and the venation in the seed wings is weak
Pecos County
This specimen has 3 serrations per millimeter
In Pecos County the Duck Creek is about 20 feet thick and contains a prominent ammonite fauna dominated by Schloenbachia and Eopachydiscus
Mazon Creek Fern P-MC-16-020 Carnivorous Dinosaur This specimen is very goodNeuropteris 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