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ostracod grainstone
This is a very excellent fossil spider from the Parachute Creek beds in Utah
Corson County
These hairs then wither to release the fly
This example is collected from the 18-inch layer
Mazon Creek Fern P-MC-16-012 Jurassic ostracod grainstonePecopteris 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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