Here is a extraordinarily double. The first specimen is shown from the ventral side so that the hypostome is exposed; the other specimen is a complete enrolled one. | |||
Location: | Mt. Orab, Ohio , USA | ||
Size trilobite: | largest is about 30 mm long | ||
Age: | Ordovizian, Richmond Formation, Arnheim Member, (about. 470 mill. y.o.) |