Geodes

Here are some links to online information and photos about geodes:

This Illinois State Geological Survey page has lots of information about geodes found in the state of Illinois: http://isgs.illinois.edu/outreach/geology-resources/geodes-small-treasure-vaults-illinois

These two websites have lots of photos and information about the geodes found near the Mississippi River in Illinois and Iowa (which are often called “Keokuk Geodes”):

This Indiana State Museum page has information about geodes found in Indiana: https://indianastatemuseum.wordpress.com/2009/01/23/the-secret-of-geodes/

This web page has information and photos of geodes from all over the world (including Dugway, Utah): https://geology.com/articles/geodes/