The article is concerned with the problem of the occurrence and influence of Middle Triassic volcanic activity in the Reifling intra-platform depression pelagic sediments of the Choc Nappe (Hronic Unit), Central Western Carpathians. The results of the clay and accessory minerals, chemical and mineral composition of clay layers from five selected sedimentological profiles are combined in this work. In comparison with data from neighbouring regions the Northern Calcareous Alps, Southern Alps, Hungarian Block and Dinarides, where the Middle Triassic volcanic rock products are known and documented, the area of the Central Western Carpathians was distant from the centres of this volcanism. This was probably the main reason why the presence of Middle Triassic volcanic products in the Choc Nappe sediments has not been unambiguously proved. We suggest, that in area of the Hronic Unit, the distant volcanism of neighbouring tectonic zones has been manifested only indirectly in the lithological and facial composition of the pelagic carbonates and the mineralogical and chemical composition of the clay fraction.