| Here is a large Negative of this rare Trilobite as a study piece. The Fossil shows some very good details. | |||
Location: | Spence Gulch, near Liberty, Idaho USA | ||
| Size trilobite: | about 30 mm long | ||
| Age: | Middle Cambrian, Spence Shale., Langston Fm. (about. 518 Mill. y.o.) | ||