Mazon Creek Virtual Exhibit- University of California Museum of Paleontology: This page has more detailed information and additional links on the fossils at Mazon Creek, as well as the rocks, environment, plants, and animals of the Carboniferous.
Mazon Creek Fossils: Hosted by the Illinois State Museum in Springfield, IL, this site is a great resource for information on the rocks, fossils, and history of the Mazon Creek area, including many excellent images.
Sue at Chicago's Field Museum of Natural History: Excavated in South Dakota and now on display in Chicago, Sue is the world's largest, most complete, and best preserved Tyrannosaurus rex. Take a tour of this website for detailed information about Sue.
First Families of Chicago: Local geology of the Chicago, Illinois, area, complete with descriptions of the fossils found there.
The Midwestern U.S. at 16,000 Years Ago: A virtual exhibit detailing plant and animal life in the midwestern United States at the end of the last Ice Age