The radiolarian biostratigraphy of the Middle–Upper Jurassic pelagic siliceous sediments (Czajakowa Radiolarite
Formation) in the Niedzica succession of the Pieniny Klippen Belt (Carpathians) is interpreted in terms of their
age in a stratotype section, and facies equivalents in other tectonic-facies units of this region. The siliceous sediments
are represented by radiolarian cherts and silicified limestones which are underlain and overlain by red nodular
limestones, equivalents of the Rosso Ammonitico facies. The radiolarian association includes thirty-seven
taxa belonging to twenty one genera which represent the Northern Tethyan Palaeogeographic Province. Key radiolarians
recorded provide a means of correlation with zonation schemes based on Unitary Associations defined
for the Jurassic Tethyan sediments. The age of the Czajakowa Radiolarite Formation in the stratotype section
is determined as U.A.Z.9 to U.A.Z.11 corresponding to middle Oxfordian up to Kimmeridgian. Comparison of
radiolarian biozones from the stratotype section with other facial equivalent sections in the Pieniny Klippen Belt
reveals a significant diachronism for both the lower and the upper limits of the Jurassic pelagic siliceous facies.