Here is a nice specimen with fine details of a Ectillaenus in a famous Rokycany Ball. Only 1 of 100 concretions contains a good fossil. | |||
Location: | Rokycany Osek, Barrandian area, Czech Republic | ||
Size trilobite: | about 28 mm long | ||
Age: | Middle Ordovician, Llandeilo, Šárka Formation (About 464 mill. Years old) |