Trilobite fossil. Over 17,000 known species roamed the oceans for over 270 million years. All gone now...
Diprotodon, meaning "two forward teeth", sometimes known as the giant wombat or the hippopotamus wombat, is the largest known marsupial ever to have lived. Along with many other members of a group of unusual species collectively called the "Australian megafauna", it existed from approximately 1.6 million years ago until extinction some 46,000 years ago.
Trilobite with exquisite detail.
Olenoides nevadensis is at once very rare and more spinous than most Cambrian trilobites, as can be seen by the needle-like axial spines and similar pygidial spines. While from a formation (Marjam Formation, Milliard County, Utah) that yields abundant trilobites, you very seldom see this species. This specimen, at 50 mm, is both large and much better preserved than most, with the axial spines in high relief.
Harpetida Scotoharpes sp.
The trilobite Triarthrus, preserved in pyrite, from the Ordovician of Upstate New York.
Dalmanites limulurus Family Dalmanitidae Middle Silurian Rochester Shale Formation Middleport, New York
Euproops danae was a small xiphosuran. The horseshoe crab is its ...