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  2. Paleontology in Illinois - Wikipedia

    en.wikipedia.org/wiki/Paleontology_in_Illinois

    The location of the state of Illinois. Paleontology in Illinois refers to paleontological research occurring within or conducted by people from the U.S. state of Illinois. Scientists have found that Illinois was covered by a sea during the Paleozoic Era. Over time this sea was inhabited by animals including brachiopods, clams, corals, crinoids ...

  3. Mazon Creek fossil beds - Wikipedia

    en.wikipedia.org/wiki/Mazon_Creek_fossil_beds

    The Mazon Creek fossil beds are a conservation lagerstätte found near Morris, in Grundy County, Illinois. The fossils are preserved in ironstone concretions, formed approximately 309 million years ago in the mid- Pennsylvanian epoch of the Carboniferous period. These concretions frequently preserve both hard and soft tissues of animal and ...

  4. List of the prehistoric life of Illinois - Wikipedia

    en.wikipedia.org/wiki/List_of_the_prehistoric...

    Selected Paleozoic taxa of Illinois. Illustration of a fossil of the Carboniferous-Permian spider Arthrolycosa. Charles Emerson Beecher (1889). Fossil of the Middle-Late Ordovician giant trilobite Isotelus. Life restoration of the Carboniferous-Permian amphibian Phlegethontia.

  5. List of the Paleozoic life of Illinois - Wikipedia

    en.wikipedia.org/wiki/List_of_the_Paleozoic_life...

    List of the Paleozoic life of Illinois. 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.

  6. Maquoketa Group - Wikipedia

    en.wikipedia.org/wiki/Maquoketa_Group

    It does not contain many fossils, although large trilobites and large cephalopods are known from Elmer-Lason Quarry. It is typically 75 to 100 feet thick. It is the only formation of the Maquoketa Group that is not exposed in northeastern Illinois. The type section for the Scales Formation is in Jo Daviess County, Illinois.

  7. A ‘striking’ creature with large spiky legs roamed what’s now ...

    www.aol.com/scientists-uncover-striking-ancient...

    Expert fossil preparator Bob Masek first discovered the specimen in the 1980s in the fossil deposits preserved at Illinois’ Mazon Creek Lagerstätte. ... Paleontologists have only found this ...

  8. Geology of Illinois - Wikipedia

    en.wikipedia.org/wiki/Geology_of_Illinois

    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]

  9. List of U.S. state fossils - Wikipedia

    en.wikipedia.org/wiki/List_of_U.S._state_fossils

    Florida: There is no state fossil in Florida, though agatised coral, which is a fossil, is the state stone. Hawaii. Iowa: The crinoid was proposed in 2018. [2] Minnesota: The giant beaver was proposed in 2022. [3] New Hampshire: The American mastodon (Mammut americanum) was considered in 2015.