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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.
The Pohlsepia mazonensis fossil was found specifically in the Pit 11 region, within the Francis Creek Shale Member [7]. Like most soft tissue fossils found in Mazon Creek, it is preserved as a 2D light-on-dark discolouration of the matrix [8]. The Francis Creek Shale Member of the Carbon Formation has a diverse array of preserved plants and ...
Evolution of cephalopods. Appearance. The cephalopods have a long geological history, with the first nautiloids found in late Cambrian strata. [ 1 ] The class developed during the middle Cambrian, and underwent pulses of diversification during the Ordovician period [ 2 ] to become diverse and dominant in the Paleozoic and Mesozoic seas.
Myxinikela fossils are known from Francis Creek Shale, fossil layers which are thought to represent a shallow-water environment of fluctuating salinity and turbidity; this contrasts with modern hagfishes, which inhabit deep-water environments.
It is known from only the holotype (PE 36987), which preserves the head and thorax, and was collected from the Francis Creek Shale of the Mazon Creek fossil beds in Illinois. This species is significantly larger than even the largest specimens of T. theridion , and thus was given the specific name meaning "gigantic" in Greek.
The Mazon River or Mazon Creek ( / məˈzɒn / ), is a tributary of the Illinois River in the United States. 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 ...
List of fossil parks around the world. List of fossil parks in India. Pleistocene fossils in Michigan. List of human evolution fossils. Malapa Fossil Site, Cradle of Humankind – Cave. Mary Anning – British fossil collector and palaeontologist (1799–1847) Paleobiology – Study of organic evolution using fossils.
Cephalerpeton is an extinct genus of "protorothyridid" tetrapods known from the Late Carboniferous (late Westphalian stage) of Illinois. [1] Skull restoration and diagram of YPM 796. It is known from the holotype YPM 796, a partial skeleton. It was collected in the Mazon Creek site, from the Francis Creek Shale Member of the Carbondale Formation.