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Plejstocen środkowy w strefie doliny górnej Odry: Brama Morawska-Kotlina Raciborska (próba syntezy)

1988; Volume: 36; Issue: 8 Linguagem: Inglês

2299-002X

Jόzef Lewandowski,

Ancient and Medieval Archaeology Studies

MIDDLE PLEISTOCENE IN THE UPSTREAM ODRA VALLEY REGION: MORAVIAN GATE-RACIBORZ BASIN (SYNTHETICAL APPROACH) Summary Previous opinions on age and origin of Quaternary sediments in Moravian Gate and Ostrava Region are considerably varying from a model of geologic structure of Quaternary in neighboring Raciborz Basin. Differences are due to opposite neotectonic movements (uplifting in Moravian Gate and subsidence in Raciborz Basin) and ice sheet extents during successive Scandinavian glaciations. Fluvial sediments of widely understood Mazovian Interglacial (Holstein, Mindel/Riss) and palynologic sites of this age lake sediments at Stanova and Gościecin form key stratigraphic horizon for Middle Pleistocene valley deposits of Upper Odra. Alluvial of the main limited at bottom by soil Otice and from top by soil Jaktar was formed, together with corresponding fossil fluvial series of Raciborz Basin, during two erosive-depositional cycles that possibly reflect climatic variation of separate glaciations. An analysis of existing materials indicates that Moravian Gate and adjacent areas of Ostrava and Opava were three times occupied by Scandinavian ice sheet: twice during South Polish glaciations (Elstera complex, Mindel) and once during Middle Polish glaciations (Saale complex, Riss). Tills of the Opava as well as ones connected with the Kravare are according to author older than alluvial of the main terrace. On other h and tills of the Saale complex occur only within and in background of the Hlucina push moraines, northern rampart of which delimits maximum extent of ice sheet of Odra Glaciation (Oldrisov). To south of Ostrawa sediments of this glaciation are developed in extraglacial (alluvial, prolluvial, glaciolimnic and partly glaciofluvial) facies. Only such stratigraphic-genetic interpretation of Pleistocene sediments of Moravian Gate and Ostrava Region agrees entirely with geologic structure of Quaternary in Raciborz Basin. The Warta Glaciation (Riss II) in Upper Odra valley is represented by sediments of Muglinov terrace, connected with the Kravafe (Mindel II). This terrace corresponds with terrace IV (Ocice terrace) in Raciborz Basin. The latter is proved by geologic setting and palynologic description of peats from sites Muglinov and Skrecon as well as by Lower Paleolithic (Acheulean) site at Raciborz Studzienna and loess section at Ocice. Lower Pleistocene terraces of Upper Odra valley and loessy cover of described area represent Vistula Glaciation (Wurm).