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Analysis of the trace fossils from Paleogene formations of the Central Western Carpathian (Orava region)

Simo V., Starek D.

Geology, Geophysics and Environment

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2016

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Vol. 42, no. 1

126

EN

Up to now only little attention was dedicated to the study of the trace fossils in the development of the Central Carpathian Paleogene Basin in the Orava region. Occasional trace fossils findings from the Central Carpathian Paleogene formations in the Orava and others regions were referred by Plička (1987). Other specialized works on trace fossils from these formations from the Orava region were not published. Study of trace fossils is strongly influenced by the existence of well exposed outcrops within individual formations. The best exposed outcrops are situated in the basal Borové Formation as well as in the higher parts of Paleogene sequences – mainly in the Zuberec Formation. This preliminary study shows a relatively rich diversity of trace fossils associations across the Central Carpathian Paleogene Basin. We present new finds of trace fossils, within which we have classified 7 ichnogenera, 11 ichnospecies and 2 types of trace fossils, which were not closely systematically classified. Many trace fossils identified in the Orava region are typical for some palaeoenvironments, which are characterized by a specific lithology, nature of the substrate, dynamics of the environment, amount of nutrients and stability or fluctuations of oxygen in the bottom waters. The trace fossils assemblages reflect changes of depositional systems during the tectonic and sequence stratigraphic development of the basin. Early Eocene shallow-sea environment of the Borové Formation including the rocky coast, sandy dynamic littoral, transition - al and internal shelf zones are characterized by findings of traces of Entobia, Gastrochaenolites, Nummipera, Ophiomorpha and Skolithos. On the contrary, a significant deepening of the deposition environment during the Oligocene, documented by turbidite sedimentation of Zuberec and Biely Potok formations is characterised by findings of graphoglyptids ( Spirorhaphe, Nereites, Paleodiction, Protopaleodictyon, Megagrapton ) or traces of deposit feeders ( Arthrophycus, Chondrites, Planolites, Phycodes, Scolicia, Zoophycos).

2

Konfigurowanie i planowanie placówek montażowych

Josifiw J.

Zeszyty Naukowe Politechniki Rzeszowskiej. Mechanika

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2008

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z. 72 [251]

109-112

EN

The method of arrangement and planning of assembly departments of workshops is considered in future production. Formed requirements to organization of assembly production. Resulted analysis of structure of such production and set intercommunication of separate building block.

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The bivalve faunas as a basis for reconstruction of the Middle Miocene history of the Paratethys

Studencka B., Goncarova I., Popov S.

Acta Geologica Polonica

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1998

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Vol. 48, no. 3

285-342

EN

The paper deals with the Paratethyan bivalve fauna recorded in Middle Miocene marine shallow-water sandy facies. Of the 429 recognized species, 343 occur in the Lower Badenian, 71 in the Chokrakian, 316 in the Upper Badenian, and 97 in the Konkian. Bivalve faunas are analyzed in order to determine the degree of similarity of contemporaneous assemblages from the Central and Eastern Paratethys, as well from Mediterranean and Atlantic bioprovinces. The study of Lower Badenian and Chokrakian bivalve faunas (isochronous with the Langhian fauna of the Mediterranean) reveals that the Eastern Paratethys was cut off intermittently from communication with the Central Paratethys. Biogeographic affinities and the geographic pattern of Chokrakian bivalve assemblages indicates that the south-eastern part of the Eastern Paratethys was connected with the world ocean by a passage towards the East Mediterranean named the Middle Araks Straight. The species composition of Lower Badenian bivalve assemblages indicates a wide connection between the Central Paratethys and the Mediterranean. Apart from the western passage named the Transtethyan Trench Corridor, The East Mediterranean connection is postulated. Comparision of the species composition of Konkian and Upper Badenian bivalve assemblages (isochronous with the lower Serravallian assemblages of the Mediterranean) suggests active faunal interchange between the Eastern and Central Paratethys. The distributional pattern of the Konkian bivalve fauna also indicates a seawy connection towards the East Mediterranean throught the re-opened Middle Araks Straight. The strong similarity between the Upper Badenian fauna from the Central Paratethys and the Middle Miocene fauna of the Mediterranean and Atlantic bioprovinces shows the existence of open marine connection and faunal interchange despite the closure of the Transtethyan Trench Corridor.