Stratygrafia czwartorzędu w dorzeczu Bugu

Abstract

Stratigraphy of the Quaternary deposite in the Bug-river basin The autor gives in the above article the results of his field- studies on the Pleistocene deposits in the Bug-basin, beginning from the source of this river to the town Uhrusk. It is known, that to the north of Uhrusk two sheets of boulder-clay occur. Between these beds the series of interglacial deposits near Włodawa have been preserved. To the south of the geogr. latitude of Uhrusk as far as to the south side of the plateau of Sokal spread the glacial and fluvioglacial deposits of the oldest Polish glaciation (Cracovien), which may be also subdivided in two sheets, separated by a layer of laminated clays. (Outcrops near Sokal). This fact shows clearly that the oldest Polish glaciation in its maximum extent occurs in two drifts. The area of the Bug-basin south of Sokal and Krystynopol was never glaciated. The Pleistocene deposits consist of gravels, sands, laminated clays and loess. Among these deposits the author has found a more stabile stratigraphical level in the form of the fluvio-glacial sands (outwash), which are derived from the second drift of the oldest glaciation. Under the sands the laminated clays of the ice-dammed lake have been found, which overlie immediately the pre-glacial gravels. Two loesses occur above the fluvio-glacial sands.