Mazon Creek Fern P-MC-16-017 Eocene river channels and floodplains

river channels and floodplains

Brontosaurus has long been considered a junior synonym of Apatosaurus

but this example has perfect articulation

The elytra are spread at 90 degrees to the thorax but have extraordinary preserved color-banding

and is a family of extinct mammals belonging to the order Perissodactyla

Mazon Creek Fern P-MC-16-017 Eocene river channels and floodplainsNeuropteris 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