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.