| This is a trilobite head of the species Dalmanitina socialis from the Ded Hill site. | |||
| Location: | Ded Hill, Beroun, Barrandian area, Czech Republic | ||
| Size trilobite: | about 43 mm wide | ||
| Age: | Middle Ordovician, Llandeilo, Letná Formation (About 464 mill. Years old) | ||