Mazonia-Braidwood Fossil Collecting Program
Mazon Creek Pennsylvanian fossils, siderite concretions, plant and animal fossils
Core atlasILLINOIS CITY ROCKHOUNDING HUB
Chicago is the urban base for Lake Michigan beach-stone and glacial-drift research, where park and shoreline rules still control removal.
LOCAL INTERACTIVE MAP
Explore nearby Illinois records without leaving this hub. Status, coordinate precision and access evidence determine whether a pin is a realistic field destination.

Reference photograph used for rock and mineral identification. It is not from this exact location or a guarantee that collecting is permitted.
This hub uses Chicago as a geographic base, while the material mix is calculated from the records actually mapped around it.
Records are ordered by evidence status first, then distance. Open the detailed guide before treating any pin as a trip destination.
Mazon Creek Pennsylvanian fossils, siderite concretions, plant and animal fossils
Core atlasglacial erratics, dolostone, chert, fossils and beach stones
Core atlasTullimonstrum gregarium and Mazon Creek concretions
Core atlasTully monster, plant fossils, invertebrates, siderite concretions
Core atlasMineral resource occurrence
USGS ResearchMineral resource occurrence
USGS Research