| Here is a nice and rare Cystoid from the Llanvirn of the Barrandian area of the Czech Republic. | |||
| Location: | Rokycany Osek, Barrandian area, Czech Republic | ||
| Size Matrix : | about 29 x 27 mm | ||
| Age: | Middle Ordovician, Llandeilo, Šárka Formation (About 464 mill. Years old) | ||