| This is a typical "Rokycany - Nodule" with a example of the trilobite Ectillaenus katzeri. | |||
Location: | Rokycany , Barrandian area, Czech Republic | ||
| Size trilobite: | largest, about 63 mm long | ||
| Age: | Middle Ordovician, Llandeilo, Šárka Formation (About 464 mill. Years old) | ||