Mazon Creek is a Late Carboniferous fossil deposit in northeastern Illinois, roughly three hundred and nine million years old, in which plants and animals from a coastal river delta were rapidly encased in ironstone concretions called nodules, preserving soft bodied organisms, including the enigmatic Tully Monster, in unusually fine detail. Historically collected from coal mine spoil piles, the deposit remains one of the most productive sources of Carboniferous soft bodied fossils in North America.
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Protected StatusNational Monument or Landmark 1 Connections
In Discipline
Source Mazon Creek fossil beds (Wikipedia)
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1. Mazon Creek (Wikipedia)
Mazon Creek fossil beds (Wikipedia)
In Discipline: Stratigraphy, Lead paragraph
The Mazon Creek fossil beds are a konservat-lagerstätte found near Morris, in Grundy County, Illinois.
In Group: Paleozoic Fossil Sites, Lead sentence
The fossils are preserved in ironstone concretions, formed approximately 309 million years ago in the mid-Pennsylvanian epoch of the Carboniferous period.
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