Trylobity w eratykach wapieni beyrichiowych znalezionych u podnóża klifu orłowskiego w Gdyni (północna Polska)

On the beach at the foot of the Orłowo Cliff (northern Poland), numerous erratics that were transported there by ice sheets from Scandinavia andsome Baltic regions can be found. Sedimentary rocks, important to palaeontological studies, contain numerous fossils and, among others, arthropods. One of the most common rock types here is beyrichian limestone. Its fossil content allows us to recognize many varieties, such as Calymene lime-stone, Nucula limestone, Elevatus limestone and others. The present study concentrated main lyon trilobites found in these rocks and belonging to two genera: Calymene and Acaste.