Tullimonstrum gregarium, Tully Monster - DLD 3635 Fish Fossils Due to their distinctive combination

Due to their distinctive combination of broad

These Amethyst stones are facet cut and top drilled

Diplomystus dentatus was one of those Green River fish and was related to today's herring

USA during the Late Cretaceous period

Tullimonstrum gregarium, Tully Monster - DLD 3635 Fish Fossils Due to their distinctive combinationTullimonstrum 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