TRANSBOUNDARY TRANSPORT OF MOLLUSCAN SHEL LS - ERRORS INTERPRETATION AND THE IMPORTANCE IN PALEOECOLOGICAL STUDIES

Cases of vital transport and post-mortem redeposition of molluscan she lls over a distance of up to 300 km have been described that are relat ed to transport of macrophytes-substrates, gastropod shells having buo yancy, and shells with currents. When determining the paleosalinity or vertical range of the species according to the dead shells with posit ive buoyancy, it is necessary to take into account the possibility of their mass transport over significant distances. The redeposited bival ve shells or their fragments can used as markers of the ice regime. Sh ells of small gastropods can document a period of higher water body le vels. The transboundary transport of the organisms can used in buildin g phylogenetic schemes of initially freshwater species in brackish-wat er basins.