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A framework of ichthyofaunal ecostratigraphy of the Oligocene-Early Miocene strata of the Polish Outer Carpathian basin

Kotlarczyk J., Jerzmańska A., Świdnicka E., Wiszniowska T.

Annales Societatis Geologorum Poloniae

2006

Vol. 76, No 1

1-111

The paper presents the results of an analysis of ichthyofaunal variability throughout the section of the Menilite-Krosno Series (MKS) in the Outer Carpathians of Poland. The studied tanathocoenoses were formed at the bottom of a more than 2,000 m deep northern basin of the Tethys, being largely represented by the continental rise and bottoms of its narrow furrows, and - to a lesser degree - the continental slope and slopes of a submarine high. Lateral variability of statististically representative assemblages of tanathocoenoses hosted in thin, isochro- nous horizons is interpreted as a result of both local changes of ichthyocoenoses and the influence of post-mortem relocation of fishes that mainly dwelled the shelf and upper continental slope. Vertical variability, in turn, is considered as a resulting from changeable conditions of the ecological environment, the input and outflow of taxa whose evolution proceeded in the Indo-Pacific area, and the species extinction. Changeability of ichthyofauna within a ca. 16-m.y.-long interval made it possible to document and formally describe 9 zones and 4 subzones of ichthyofauna of ecostratigraphic character. These zones comprise index, representative and accompanying taxa that belong to different ecological groups. Conceptual models of the origin of ichthyofaunal assemblages of individual zones are presented. It is suggested that the origin of assemblage differentiation resulted from the appearance and disappearance of the oxygen minimum zone in the water column, global and local sea level changes, topography of the basin bottom, as well as final basin infilling by sediments of submarine fans. The described and preserved collection of fossil Carpathian fishes, housed at the Department of Palaeozoology of the University of Wrocław, requires further specialized palaeontological studies in order to reconstruct a more complete composition of the Oligocene-Early Miocene ichthyofauna.

Nowe stanowisko ichtiofauny z warstw krośnieńskich jednostki skolskiej (Karpaty fliszowe)

Jerzmańska A., Rajchel J., Świdnicka E.

Geologia / Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie

2001

T. 27, z. 1

21-37

Opisano nowe stanowisko ichtiofauny z warstw krośnieńskich jednostki skolskiej Karpat zewnętrznych z miejscowości Harta k. Dynowa. Pozyskano 143 okazy ryb, wśród których wyróżniono 9 rodzin Teleostei: Clupeidae, Gadidae, Merlucciidae, Syngnathidae, Carangidae, Leiognathidae, Trichiuridae, Scombridae, Gobiidae. Badany zespół określono jako płytkowodny, zachowany w środowisku o niedoborze tlenu. Usytuowanie stanowiska w stratygraficznym sąsiedztwie głównego V-go horyzontu tufitowego (o wieku 20,5-0,9 mln lat), oznaczonego radiometrycznie w jednostce śląskiej, pozwala określić wiek stanowiska ichtiofauny z Harty na eggenburg, w pozycji należącej do zon NN-2 i N-5. Na podstawie badanego zespołu ryb proponuje się utworzenie subzony w obrębie nienumerowanej zony INM-0

The new site of ichtyofauna was described in Harta near Dynów from the Krosno Beds of the Skole Unit in the Outer Carpathians. A total of 143 fish specimens have been collected; out of them nine Teleostei families have been distinguished: Clupeidae, Gadidae, Merlucciidae, Syngnathidae, Carangidae, Leiognathidae, Trichiuridae, Scombridae, Gobiidae. The assemblage studied has been identified as formed in shallow water and preserved in the environment with oxygen deficit. The position of the site in question in the stratigraphic proximity of the main, i.e. V/th, tuff horizon, whose age was radiometrically determined at 20.5--0.9 Ma, dates the site with ichtyofauna as Eggenburg (zones NN-2 and N-5). On the basis of these determinations, the fish assemblage for the Harta will be determined as a subzone of the hitherto existing INM-0 zone