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This article contains a list of fossil-bearing stratigraphic units in the state of Illinois, U.S. Sites. Group or Formation ... Galena Dolomite: Ordovician: Dubuque ...
It is Upper Ordovician in age and named for the Maquoketa River in Iowa. It exists in Missouri, Wisconsin, Iowa, Illinois, and Indiana. It is equivalent to the all but the basal formations of the Cincinnati Group in Ohio. Illinois and Indiana are the only states where the Maquoketa is considered a group. In other states it is a formation.
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.
Location; Region Illinois: ... The Galena Dolomite is a geologic formation in Illinois. It preserves fossils dating back to the Ordovician period.
Galena Group: Location; Region: Illinois, ... United States: The Dubuque Formation is a geologic formation in Illinois, Iowa, ... It preserves fossils dating back to ...
Life restoration of the Permian snake-like amphibian Lysorophus showing speculative egg-coiling behavior †Lysorophus – type locality for genus †Marsupiocrinus †Meristina †Metacoceras †Milosaurus – type locality for genus †Monograptus †Monograptus dubius †Murchisonia †Naticopsis †Naticopsis carleyana †Naticopsis planifrons
Florissant Fossil Beds: Florissant Formation: Eocene (Priabonian) North America: US: Colorado: Insects: Fossil Prairie Park: Devonian: North America: US: Iowa: Mazon Creek: Francis Creek Shale: Carboniferous (Pennsylvanian) North America: US: Illinois [Note 1] Ghost Ranch: Triassic: North America: US: New Mexico: Non-Avian Dinosaurs [Note 1 ...
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 ...