Sponge fossils of Middle Dnieper River Upper Eocenian deposits (geological survey sheet area «Kobelyaki»)


  • T. A. Stephanska Oles Gonchar Dnipropetrovsk National University

Abstract

For the first time sponge spicules of the Paleogene on the geological survey sheet area «Kobelyaki» were studied. Using artificial classification M.M. Ivanik (2003) 45 taxa spicules were found in rocks. Morphological types spicules were defined. In the complexes following megascleres of «soft» Demospongiae are dominant: pro-, plagio-, ortho-,  dicho-, anatriaenes, caltrops, smooth and echinated oxeas, subtylostyls, strongyls, ophioxeas. Diaenes, monenes, caltrops with reduced beam (olimtriaenes), are less common. Microscleres are numerous: sterrasters, sphaerasters, oxysphaerasters, oxyasters. Fragments of dyctional gratings without lychnisks and free spicules of hexactinellid sponges are frequent (pentactines, hexactines). Megascleres of lithistid sponges (phyllotriaenes, tetracrepid desmas, triders, megaclones, dicranoclones) are relatively few. The palaeocenosis structure that existed in the Obukhov Sea on this area, it was found by morphological analysis of sponges spicules. In the Obukhov time following sponges dominated here: «soft» sponges with unrelated skeleton that belonged to the class Demospongiae (orders Poecilosclerida, Astrophorida and families Geodiidae, Pachastrellidae, Ancorinidae, Calthropellidae, Tethyidae, Crellidae) and hexactinellids of class Hexactinellida (orders Hexactinosida and Lyssacinosida). А few sponges spicules (belonged to the subclass Lithistida, families Corallistidae, Theonellidae, Phymaraphiniidae, Chenendoporidae, Pleromidae) and lack lithistid skeletal gratings fragments in the studied complexes may indicate a desmas transfer from neighboring, a shallow Obukhov stations, which were confined to the nearby slope of the Ukrainian Shield. On the base of sponge spicules studying the Late Eocene (Obukhov) age of surrounding deposits is proved.Key words: spongе spicula, Upper Eocene, Obuchovian Suite, Middle Dnieper region. 

Author Biography

T. A. Stephanska, Oles Gonchar Dnipropetrovsk National University
Oles Gonchar Dnipropetrovsk National Universityassistant professor (docent) Department of geology and hydrogeologyCandidate of Geological Sciences (PhD)

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Published
2015-03-06
How to Cite
Stephanska, T. (2015). Sponge fossils of Middle Dnieper River Upper Eocenian deposits (geological survey sheet area «Kobelyaki»). Journal of Geology, Geography and Geoecology, 23(1), 114-124. https://doi.org/https://doi.org/10.15421/111516