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Ask a Geologist

Are you curious about the geology of Illinois? Have you found a rock, mineral, or fossil that you would like to know more about? Submit your questions and photos to the Office of Illinois State Geologist!

Question


Photos
You can submit up to 3 photos of the item(s). Clear, high-resolution photos that include a ruler for scale are the most useful in making identifications! Submitted photos may be used in social media posts and/or on the Illinois State Geologist's blog.
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