Mazon Creek, Paleontological site in Grundy County, Illinois, United States.
The Mazon Creek fossil deposits contain perfectly preserved remains of plants and animals within ironstone concretions from the Carboniferous period.
The site gained National Historic Landmark status in 1997, recognizing its exceptional collection of 309-million-year-old fossils from the Pennsylvanian epoch.
Scientists and researchers from around the world study the Mazon Creek fossils at the Field Museum of Natural History to understand ancient biodiversity.
Visitors can collect fossils at Braidwood State Fish and Wildlife Area with an official permit, following specific preservation guidelines.
The site contains over 320 animal species and 400 plant species preserved through a special process involving siderite mineral formation.
Location: Grundy County
GPS coordinates: 41.32100,-88.34600
Latest update: May 24, 2025 08:38
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