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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 ...
Schram, 1969. Other species. †T. gigantion. Schram, 2007. Tyrannophontes is an extinct genus of mantis shrimp that lived during the late Carboniferous period in what is now the Mazon Creek fossil beds of Illinois. It is the only genus in the family Tyrannophontidae. The type species, T. theridion, was described in 1969 by Frederick Schram.
T. gregarium fossil (part and counterpart). Amateur collector Francis Tully [] found the first of these fossils in 1955 in a fossil bed known as the Mazon Creek formation. He took the strange creature to the Field Museum of Natural History, but paleontologists were stumped as to which phylum Tullimonstrum belonged in. [7] The species Tullimonstrum gregarium ("Tully's common monster"), as these ...
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 ...
Essexella is an extinct genus of cnidarian known from Late Carboniferous fossils; it contains a single species, E. asherae. It is one of the most recurrent organisms in the Mazon Creek fossil beds of Illinois; [ 1] in the Essex biota of Mazon Creek, it consists of 42% of all fossil finds. [ 2] Essexella was originally described as a jellyfish ...
Douglassarachne is known from Mazon Creek which preserves fossils around 308 million years ago. The fossil was preserved in a siderite concretion. [1] [2] In 1980, Bob Masek discovered the fossil at the Pit 15 Northern Mine spoil heap, near Essex, Kankakee County, Illinois. Around 1990 he would sell the fossil to David Douglass. [1]
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 ...
In two Moscovian-age (approximately 309 mya) fossil locations, Mazon Creek fossil beds in Illinois, U.S.A and Okmulgee in Oklahoma, U.S.A., Macroneuropteris is exceptionally abundant. Along with the leaves of Psaronius, it comprises nearly 60% of the flora in these fossil beds. [10] [26] It is commonly found in the fossils above coal seams.