Tullimonstrum, colloquially known as the Tully Monster, is an extinct genus of soft-bodied bilaterian that lived in shallow tropical coastal waters of muddy estuaries during the Pennsylvanian geological period, about 300 million years ago.
was originally found among the Mazon Creek Deposits, it has since been found in a few additional locations in central Illinois where surface coal mines have been opened and revealed fossil beds.
Where is the Tully monster found?
Tullimonstrum (also known as the Tully Monster), a 300m-year-old fossil discovered in the Mazon Creek fossil beds in Illinois, US, is one such creature.
How many Tully monster fossils have been found?
Official State Fossil of Illinois
So far Tully monster fossils are unique to Illinois - more than 100 Tully monster fossils have been found in the state (amateur collector Francis Tully found the first in 1958).
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