Acknowledgement

bonate. The mineral composition of sediments and internal fab-ric of individual minerals indicates that the muscovite-biotite bearing-granites can be considered a potential source rock. Particular lithofacies and ichnofossils were studied to un-derstand of the original deposition environment. Studied drill cores contain features which can be interpreted as reflection of both terrestrial and marine influences. Studied deposits were most likely deposited under strong influence of fluvial environ-ment (braided river?). Terrestrial environment was assumed by an absolute majority of previous authors (Dvoøák, 1998; Skoèek, 1980; Zádrapa et al., 1983 etc.). Trace fossils helped to trace the marine influences in sedimentation (Mikuláš and Nehyba, 2001). The depositional environment was in the studied case affected by the marine conditions in its marginal or distal areas (interdistributary area, braided delta?), probably during reduced fluvial supply or channel shifting. Shallow marine condition can be assumed