Science and earth science

Acta Geologica Polonica

Content

Acta Geologica Polonica | 2014 | vol. 64 | No 2 |

Abstract

Abstract Echinoderms from the Badenian (Middle Miocene) of the Fore-Carpathian Basin of western Ukraine are facies restricted. The Mykolaiv Beds, stratigraphically older, yielded the starfish Astropecten forbesi (complete skeletons), two genera of sand dollars (Parascutella, Parmulechinus), and numerous other echinoids of the genera Psammechinus , Echinocyamus, Spatangus, Hemipatagus, Echinocardium, Clypeaster, Echinolampas, and Conolampas. The stratigraphically younger, calcareous Ternopil Beds yielded Eucidaris (complete coronae, isolated spines), Arbacina , Brissus, and Rhabdobrissus. Sixteen species of echinoids are distinguished and/or commented. A new brissid, Rhabdobrissus tarnopolensis sp. nov., is established. A mass occurrence of some species (Psammechinus dubius and Hemipatagus ocellatus) contrasts with that of mass aggregations (sand dollars and Echinocardium leopolitanum) by dynamic events in selected layers of proximal tempestites. Of special note is the occurrence of very small specimens, interpreted as juveniles (‘babies’) having been swept out of their restricted biotopes (‘nurseries’). Some species hitherto regarded as of Early Miocene age, and the problem of their persistence beyond the Fore-Carpathian Basin and/or migration into that basin during the Middle Miocene transgression are discussed.
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Editor-in-Chief
Ireneusz Walaszczyk, Faculty of Geology, University of Warsaw, Poland

Editorial Advisory Board Andrzej Radwański, University of Warsaw, Poland Zdzisław Bełka, Adam Mickiewicz University Poland Max Laurence Coleman, The University of Reading, U.K. Jerzy Fedorowski, Adam Mickiewicz University Poland Ryszard Gradziński, Polish Academy of Sciences, Poland Peter J. Harries, University of South Florida, USA John W.M. Jagt, Natuurhistorisch Museum Maastricht, The Netherlands William James Kennedy, Oxford Natural History Museum, U.K. Jan Kutek, University of Warsaw, Poland Anatoly MikhailovicNikishin, Moscow State Univesity, Russia Nestor Oszczypko, Jagiellonian University, Poland Michał Szulczewski, University of Warsaw, Poland Karl-Armin Tröger, Technische Universiät, Freiberg, Germany Sue Turner, Queensland Musem, Australia Alfred Uchman, Jagiellonian University, Poland Jerzy Znosko, Stage Geological Survey, Poland Andrzej Żelaźniewicz, Polish Academy of Sciences, Poland

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