On the basis of very similar mineralogic-geochemical character of the sediments of the Subchert beds and the Menilite Formation of the Silesian and Zdanice units it is possible to state that the sediments of the Subchert beds which were in the past assigned to the Submenilite Formation belong to the Menilite Formation. Results of the mineralogic-geochemical study of the Krosno beds of the Silesian unit and Zdanice-Hustopece Formation of the Zdanice unit suggest that the source areas of the investigated sediments were similar and that the sediments originated from a single important source area. During the deposition of the Krosno beds and Zdanice-Hustopece Formation, clastic material was not transported from the deeply eroded Bohemian Massif, but more probably it was supplied from the east — Magura zone area.