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The flower is staminate with globose anthers attached to individual filaments
and early Tithonian stages of the Late Jurassic period
The validity of these additional species has been questioned
halfway between Nuremberg and Munich and were originally quarried as a source of Lithographic limestone
Mazon Creek Fern P-MC-16-002 Damselfly The flower is staminate withNeuropteris 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