Journal : Acta Geologica Polonica
Article : Faunal dynamics of gastropods in the Bathonian (Middle Jurassic) ore-bearing clays at Gnaszyn, Kraków-Silesia Homocline, Poland

Authors :
Gedl, P.
Institute of Geological Sciences, Polish Academy of Sciences, Senacka 1, 31-002 Kraków, Poland, ndgedl@cyf-kr.edu.pl,
Leonowicz, P.
Institute of Geology, University of Warsaw, Al. Żwirki i Wigury 93, PL-02-089 Warszawa, Poland, Paulina.Leonowicz@uw.edu.pl,
Dudek, T.
Institute of Geological Sciences, Polish Academy of Sciences, Senacka 1, PL-31-002 Kraków, Poland, tereska_wing@yahoo.co.uk,
Witkowska, M.
Institute of Geological Sciences, Jagiellonian University, Oleandry 2a, PL-30-063 Kraków, Poland, magda.witkowsky@interia.pl,
Gedl, P.
Institute of Geological Sciences, Polish Academy of Sciences, Senacka 1, 31-002 Kraków, Poland, ndgedl@cyf-kr.edu.pl,
Boczarowski, A.
Faculty of Earth Sciences, University of Silesia, Będzińska 60, PL-41-200 Sosnowiec, Poland, a.boczarowski@chello.pl,
Kaim, A.
Institute of Paleobiology, Polish Academy of Sciences, Twarda 51/55, 00-818 Warszawa, Poland ; Bayerische Staatssammlung fur Palaontologie und Geologie, Richard-Wagner-Str. 10, 80333 Munchen, Germany, kaim@twarda.pan.pl,
Abstract : The succession of gastropods in the Gnaszyn section is quite monotonous and shows significant changes only in the proximity of concretion layers, at least partially because of diagenetic reasons. Otherwise, the section is dominated by gastropods (cylidrobullinids, bullinids, and mathildids) most of which preyed probably on sedentary organisms (polychaetes and/or coelenterates) that possibly flourished on the sea bottom at that time. The other groups of gastropods are represented by larval or juvenile shells. Their presence shows that the environmental conditions that were probably unfavourable for gastropods living directly on the sea bottom most likely because of a soupy substrate consistency, possible oxygen deficiency near the sediment-water interface and/or oxygen content fluctuations. Adult and/or subadult individuals of these gastropods occur only in the higher part of the section, reflecting a time when these conditions improved. A new heterostrophic gastropod species, Promathildia gedli, is described.

Keywords : Baton, Gnaszyn, iły rudonośne, jura, paleoekologia, Polska, ślimaki, Bathonian, Gastropods, Gnaszyn, Jurassic, Ore-bearing clays, Palaeoecology, Poland,
Publishing house : Faculty of Geology of the University of Warsaw
Publication date : 2012
Number : Vol. 62, no. 3
Page : 367 – 380

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DOI :
Qute : Gedl, P. ,Leonowicz, P. ,Dudek, T. ,Witkowska, M. ,Gedl, P. ,Boczarowski, A. ,Kaim, A. ,Kaim, A. , Faunal dynamics of gastropods in the Bathonian (Middle Jurassic) ore-bearing clays at Gnaszyn, Kraków-Silesia Homocline, Poland. Acta Geologica Polonica Vol. 62, no. 3/2012
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