| Here is a trilobite of the species Placoparia barrandei from a classic Rokycany concretion. This trilobite comes with the positive and negative side. | |||
Location: | Rokycany Osek, Barrandian area, Czech Republic | ||
| Size trilobite: | about 23 mm long | ||
| Age: | Middle Ordovician, Llandeilo, ¦árka Formation (About 464 mill. Years old) | ||