Age of the Nowa Wieś Formation (Bardzkie Mts., Middle Sudetes, SW Poland)

Arkadiusz Głuszek, Anna Tomaś


Wiek formacji Nowej Wsi (Góry Bardzkie, Sudety Środkowe)

The Nowa Wieś Formation in theBardzkie Mts. includes gneiss-limestone conglomerate, limestone conglomerate and nodular limestone in its uppermost portion. These sediments are exposed in the Dzikowiec - Nowa Wieś - Srebrna Góra zone and they have also been penetrated in the borehole Zdanów IG-1 at the depth interval 1601,9 -1571,8 m. They contain abundant and diverse fauna, mainly crinoids, foraminifera, algae and bryozoans. The nodular limestone includes also common siliceous sponge spicules, radiolarians and calcispheres.

The fossil-bearing calcareous debris, which includes stratigraphically important foraminifera, was shed from a shallow-water area to the deeper part o f the shelf. The fossils are almost contemporaneous with the sediment. During the deposition of nodular limestone this material was transported to the area of pelagic sedimentation.

The foraminiferal fauna is not mixed and it dates the calcareous part of the Nowa Wieś Formation at the CD - Cf4 Zones (Uppermost Tournaisian-Lower Visean). This dating confirms the older dating by Paeckelinann (1930) and partly those by Górecka & Mamet (1970) and Chorowska (1973). It conflicts, however, with the datings by Chorowska & Radlicz (1984) and Haydukiewicz (1986). Therefore, the interpretation of Wajsprych (1986) based on the later datings is brought in question.

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