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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 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.
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.
This list of fossil sites is a worldwide list of localities known well for the presence of fossils.Some entries in this list are notable for a single, unique find, while others are notable for the large number of fossils found there.
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
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 ...
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.