Ridgway Quadrangle - ISGS

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We’ve recently redesigned the Illinois State Geological Survey website, and the page you are looking for is no longer here. Maybe try one of the links below or a search?

If you’re looking for maps, publications, GIS applications or wikis, you’ll find them on our new Resources site.

For services like drilling or geochemistry, you’ll want our Capabilities & Services page.

If you’re looking for someone on our staff, try the Directory.

If you need ISGS data, please fill out our data request form.

Finally, if you’ve found a rock, mineral or fossil that you would like to know more about, you can submit questions and upload images through our Ask a Geologist form.

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