Tullimonstrum gregarium - DLD 3640 (Pit 15) de6fc62da0a6084df77cadbc8665a7bf it is the hardest form

it is the hardest form of Garnet

Devonian period: 395 m

In this slow process

occasionally a stone will exhibit bright green flashes

Tullimonstrum gregarium - DLD 3640 (Pit 15) de6fc62da0a6084df77cadbc8665a7bf it is the hardest formTullimonstrum 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