Where can i find geodes in illinois?

Question

please be specific, and please dont answer, "in a store" for rocks or something. A place where i can actually go to find them.

Answer 1

Geodes found in Illinois range from less than 1 inch to more than 2 feet in diameter, but 3 to 5 inches is the average. They generally occur in limestone, a calcium carbonate, or in dolomite, a calcium-magnesium carbonate. Although geodes can be found in carbonate-rich rocks throughout the state, one of the most famous geode collecting areas in the country is in western Illinois and adjacent parts of Iowa and Missouri. The region encompasses about a 70-mile radius from the towns of Warsaw, Hamilton, and Nauvoo.