Tullimonstrum gregarium, Tully Monster - DLD 789 c7ff24b41be03fc7ccf73b3dd2675a57 Colors or inclusions in Quartz

Colors or inclusions in Quartz are due to the presence of other minerals (particularly iron)

Although Zircon is common in the Earth's crust

Unique Calcite formations are created inside the caves where calcium rich water penetrates the cavern's limestone enclosure and slowly drips and flows on top of itself

A hadrosaur chevron is a v-shaped bone on the underside of the tail of a duck-billed dinosaur that protected nerves & blood vessels

Tullimonstrum gregarium, Tully Monster - DLD 789 c7ff24b41be03fc7ccf73b3dd2675a57 Colors or inclusions in QuartzTullimonstrum 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