Title: Correlation between the Quaternary continental sediments in North-eastern Bulgaria with the marine sediments in the Black Sea Shelf
Abstract: North-eastern Bulgaria was an extraglacial region during the Quaternary. The active erosion and abrasion in this region is connected with the pluvial facies of the glaciation epoch. The alluvial sediments in the terraces – T0-T6, accumulated during the relevant glacial and stacial cycles were sources of fine grained loess. The loess accumulated from a given cycle lies over the older terraces and levels then denuded for eolian sedimentation. The active eolian activity has to be connected with the deglaciation phases of the glaciers. From the beginning of the Quaternary the effects of five big glaciations corresponding to the regressions of the sea are marked in the Black Sea region. These are: Dunavium, Günz, Mindel, Riss and Würm. The alluvial soil on the seventh loess reveals that there has been a break in sedimentation - the regression of Günz 2. The alluvium of sixth loess - the Mindel regression, that of fifth loess - the regression of Riss 1 and the alluvium of fourth loess - maybe the regression of Riss 2. The alluvium of third loess (corresponding lo the glaciation (W1) - the Post-Karangatian regression, this of second loess (W2) - the break which caused the deposition of continental sediments over the Lower New Euxinian Substage and this on first loess (W3) - the regression between the Upper Pleistocene and Holocene sediments. The break, in recent soil time, probably corresponds to the Fanagorian regression.