| This is a relative rare example of a "Rokycany - Trilobite" of the species Ectillaenus katzeri from the Šárka Formation. Today is the collecting of the famous "Rokycany - Concretions" on the fresh plowed fields around Rokycany prohibited. | |||
Location: | Rokycany , Barrandian area, Czech Republic | ||
| Size trilobite: | about 46 mm long | ||
| Age: | Middle Ordovician, Llandeilo, Šárka Formation (About 464 mill. Years old) | ||