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The Mazon Creek fossils are found in the Upper Carboniferous Francis Creek Shale. [6] The type locality is the Mazon River (or Mazon Creek), a tributary of the Illinois River near Morris, Grundy County, Illinois. The 25 to 30 meters of shale were formed approximately , during the Pennsylvanian period.
Early in the ensuing 20th century a Silurian age fossil reef system was discovered in the state. In the 1950s Francis Tully discovered the "monster" that would later be named in his honor. The Pennsylvanian species Tullimonstrum gregarium ("Tully Monster") is the Illinois state fossil. It is one of the few officially designated state fossils ...
This list of fossil sites is a worldwide list of localities known well for the ... Ziegler Reservoir fossil site ... Bullock Creek: Camfield Fossil Beds: Miocene:
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 ...
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.
†Hallopora – tentative report †Halysites †Harpidium †Helenodora – type locality for genus †Helenodora inopinata – type locality for species †Heliomeroides †Holia †Hyolithes †Ilyodes †Isodectes; Fossil of the Middle-Late Ordovician giant trilobite Isotelus. †Isotelus †Isotelus gigas †Isotelus maximus †Kionoceras
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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.