Oligocene/Miocene boundary in the Polish Outer Carpathians Based on calcareous nannoplankton
Journal Title: Biuletyn Państwowego Instytutu Geologicznego - Year 2008, Vol 432, Issue 432
Abstract
The aim of this work was to establish the Oligocene/Miocene boundary in the eastern part of the Polish Outer Carpathians on the basis of calcareous nannoplankton analysis. The investigations focused on the Menilite-Krosno Series of the Silesian and Skole Units overlying the Jasło and/or Zagórz limestone chronohorizons. In the Silesian Unit, the Oligocene/ Miocene boundary is placed in the upper part of the Lower Krosno Beds. In the Otryt facial region (southern part of the Silesian Unit), this boundary runs within the upper part of the shaly– sandy Supra–Otryt series of the Lower Krosno Beds. In the southern part of the Lesko facial region, the boundary is established within a series of thick-bedded sandstones and fine-rythmical turbidite deposits of the Lower Krosno Beds. In the northern part of this region, the series is replaced by thick-bedded sandstones of the Lesko facies. Miocene taxa were recorded in the upper part of these deposits. In the southern part of the Skole Unit the Oligocene/Miocene boundary runs within the lower part of the Lower Krosno Beds, whereas in the more northern and western parts of the unit – within the Menilite Beds. Among taxa proposed as indicative for the Oligocene/Miocene boundary, [i]Helicosphaera mediterranea[/i] Müller, [i]Helicosphaera recta[/i] Haq, [i]Helicosphaera scissura [/i]Miller, [i]Dictyococcites bisectus[/i] (Hay, Mohler et Wade) Bukry et Percival, [i]Zygrhablithus bijugatus[/i] Deflandre, [i]Sphenolithus delphix[/i] (Bukry) were recorded.
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Małgorzata GARECKA
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