Tullimonstrum gregarium, Tully Monster with Eye Bar (Pit 11) Marine Fossils The stone resembles ordinary limestone

The stone resembles ordinary limestone but when wet or polished

making it the second hardest natural mineral

especially in Randolph County

Eurypterus remipes is the state fossil of New York

Tullimonstrum gregarium, Tully Monster with Eye Bar (Pit 11) Marine Fossils The stone resembles ordinary limestoneTullimonstrum 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