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Pecos County
Apatosaurus had an average length of 21–22
These are rare and it was collected in the 18-inch layer
This specimen is very good quality for the locality and is prepared on matrix
Mazon Creek Fern P-MC-16-020 Carnivorous Dinosaur Pecos CountyNeuropteris 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
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