The Earth Science Club of Northern Illinois (ESCONI)

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Mazon Creek Fossil Day

Coal City Public Library 85 N. Garfield St., Coal City, IL, United States

The Mazon Creek fossil beds are a conservation lagerstätte found near Morris, in Grundy County, Illinois. The fossils are preserved in ironstone concretions, formed approximately 309 million years ago in the mid-Pennsylvanian epoch of the Carboniferous period. Displays of Mazon Creek Fossils. Books on Mazon Creek Fossils