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Fossils are common from the Ordovician through the Pennsylvanian. Illinois has a reputation for rocks bearing large numbers of trilobite fossils, often of very high preservational quality. [1] There is a gap in Illinois' geologic record from the Mesozoic to the Pleistocene. During the Ice Age, Illinois was subject to glacial activity.
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.
The most common species found is the Essexella sea anemone. It consists of 42% of all fossils finds in the Essex biota. [9] The Essex area also includes the most famous faunal member of the Illinois state fossil Tullimonstrum, known popularly as the "Tully Monster".
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 ...
Paleogeographic reconstruction showing the Illinois Basin area during the Middle Devonian period. [9] Almost all Silurian rocks in Illinois are deep-water limestone and dolomite deposits; reef habitats were common, and fossils of reef organisms are locally highly abundant, including corals, brachiopods, crinoids, stromatoporoids, and bryozoans. [6]
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 ...
It is common to designate a fossilized species, rather than a single specimen or a category of fossils. State fossils are distinct from other state emblems like state dinosaurs , state stones , state minerals , state gemstones or state rocks and a state may designate one, a few, or all of those.
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.