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Illinois was covered by a sea during the Paleozoic. Over time this sea would be inhabited by animals like brachiopods, clams, corals, crinoids, snails, sponges, trilobites. [3] 500 million years ago, during the Cambrian, the seas of Illinois resembled those of the modern Bahamas. [4] At the time, Illinois was located near the equator. [5 ...
This article contains a list of fossil-bearing stratigraphic units in the state of Illinois, U.S. Sites. Group or Formation ... Tar Springs Formation: Carboniferous:
Richardson's Guide to the Fossil Fauna of Mazon Creek. Northeastern Illinois University. ISBN 978-0-925065-21-6. Jack Wittry (2006). The Mazon Creek Fossil Flora. Esconi. ISBN 978-1-932433-71-5. Jack Wittry (2012). The Mazon Creek Fossil Fauna. Esconi. ISBN 978-0578111483. Jack Wittry (2020). A Comprehensive Guide to the Fossil Flora of Mazon ...
Fossil of the Middle-Late Ordovician giant trilobite Isotelus. †Isotelus †Isotelus gigas †Isotelus maximus †Kionoceras †Latzelia – type locality for genus †Latzelia primordialis – type locality for species †Lepidodendron †Lepidodendron aculeatum †Lepidophyllum †Lepidostrobus †Lichas †Lingula †Liroceras; Lithophaga ...
Expert fossil preparator Bob Masek first discovered the specimen in the 1980s in the fossil deposits preserved at Illinois’ Mazon Creek Lagerstätte. (The German word is a term paleontologists ...
Fossil Butte National Monument [Note 3] Green River Formation: Eocene: North America: US: Utah, Colorado, and Wyoming: Fishes [Note 1] Schreiber, Ontario [Note 2] Gunflint Chert: Late Archaean – Early Proterozoic: North America: Canada: western Ontario & US: Minnesota (Gunflint Range) Stromatolite colonies of cyanobacteria: Hilda mega-bonebed ...
The confluence is near Morris, Illinois. [2] The Mazon River is associated with the Mazon Creek fossils of the Francis Creek Shale, which are also exposed in strip mines and quarries near the River. This fossil bed includes well-preserved fossils from the Pennsylvanian period of the Paleozoic era and is a world-famous Lagerstätten site.
This list of the Paleozoic life of Illinois contains the various prehistoric life-forms whose fossilized remains have been reported from within the US state of Illinois and are between 538.8 and 252.17 million years of age.