Tullimonstrum gregarium, Tully Monster - DLD 3635 Fish Fossils USA during the Late Cretaceous

USA during the Late Cretaceous period

when arranged in perfect geometry

It shows no inclusions with deep pink color

These marine creatures lived in the lower cretaceous to upper cretaceous time period

Tullimonstrum gregarium, Tully Monster - DLD 3635 Fish Fossils USA during the Late CretaceousTullimonstrum gregarium, popularly known as The Tully Monster, is the Illinois State Fossil & is perhaps one of the most mysterious fossils ever unearthed Age of the Tully Monster During the Pennsylvanian Period (roughly 307 million years ago), the land that is now Illinois lay near Earth's equator. Dense swamps, forested with primitive plants, covered much of western and central Illinois. In shallow seas nearby, the Tully monster swam along with