Tullimonstrum gregarium, Tully Monster with Excellent Eyes! (Pit 11) 2dcc1903e666d09d4edd05fb52050e98 forming a layer of gel

forming a layer of gel which eventually eats away the igneous rock

calcite and other minerals

Onchopristis are thought to have had electrosensors to detect prey swimming below them

it's believed Basilosaurus would first attack its prey by crushing its skull

Topaz is used in industrial uses due to qualities such as heat resistance

Tullimonstrum gregarium, Tully Monster with Excellent Eyes! (Pit 11) 2dcc1903e666d09d4edd05fb52050e98 forming a layer of gelTullimonstrum 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