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Mazon Creek Fossil Day
October 14, 2023 @ 10:00 am - 3:00 pm
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 for sale
Bring your Mazon Creek Fossils for identification
Free admission
Lecture on collecting Mazon Creek fossils – 1:00 pm
