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The Cretaceous in Illinois, US

Cretaceous in Illinois map

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Cretaceous Fossils
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Paleontology and geology

During the Cretaceous, a shallow seaway extended from the Arctic Ocean to the Gulf of Mexico, through the central part of North America. Portions of the seaway covered western Illinois, but as the waters receded, they left an arm of the sea behind over southern Illinois, referred to as the Mississippi Embayment. Rocks deposited in the seaway and in the embayment are found in the western part of the state near Quincy, and to the south. Leaf fossils of willow and walnut have been found in the MacNairy Formation in southern Illinois.

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Organizations | Education and Exhibits


Museums (showing 1 of 1 listings)

Burpee Museum of Natural History: The mission of Burpee Museum of Natural History is to inspire all people to engage in a lifetime of learning about the natural world.

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Education and Exhibits

Virtual Exhibits (showing 1 of 1 listings)

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.

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