VOLKHOV STAGE IN NORTH ESTONIA AND SEA LEVEL CHANGES

Abstract

Changes in ostracode diversity and mineralogical composition of insoluble residue were studied to document environmental and biological events in the Volkhov succession of North Estonia. The most prominent bioevents occur in the basal and middle parts of the stage. The higher quartz1K-feldspar ratio in silt fraction of insoluble residue of the early Volkhov carbonates is interpreted as indicative of extensive reworking and redeposition of Cambrian-earliest Ordovician terrigenous formations. The data are discussed in the context of different models of sea level changes.