Acta Geologica Polonica publishes original papers on all aspects of geology. These papers must not have been published or submitted for publication elsewhere, in entirety or in part. The articles should be of moderate length (up to 80 manuscript pages). Longer manuscripts may be accepted but authors should consult the editor before submitting these.
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Over three thousand specimens representing the superfamily Trochoidea Rafinesque, 1815 [Trochidae Rafinesque, 1815 and Calliostomatidae Thiele, 1924 (1847)] from the upper Upper Badenian = Kosovian = lower Serravallian (middle Miocene) marine deposits of Ukraine, housed in the collections of the Polish Academy of Sciences Museum of the Earth in Warsaw (MZ), are studied herein. The abundant material has allowed for investigations of the intraspecific variation and revision of earlier determinations. As a result, 21 species belonging to 5 genera have been identified, described and illustrated, of which one is new [Clanculus (Clanculopsis) krachi sp. nov.] and one is left in open nomenclature. Granulifera O. Anistratenko, 2000 is considered a junior subjective synonym of Clanculopsis Monterosato, 1879; Granulifera pulla O. Anistratenko, 2000 is considered a junior subjective synonym of Monodonta tuberculata Eichwald, 1830; Gibbula sytovae Amitrov, 1961 is considered a junior subjective synonym of Trochus miocaenicus Mayer, 1853; Gibbula volhynica Friedberg, 1928 is considered a junior subjective synonym of Trochus novemcinctus von Buch, 1830; and Trochus buchii du Bois de Montpéreux, 1831 is suppressed in favour of the senior subjective synonym Trochus puschii Andrzejowski, 1830. The geographic distribution and stratigraphic ranges of the taxa are given. Six species are known only from the Polish-Ukrainian part of the Fore-Carpathian Basin. The protoconch features are systematically studied in the Trochidae and Calliostomatidae from this area for the first time.
The mid-Ludfordian pronounced, positive carbon isotope excursion (CIE), coincident with the Lau/kozlowskii extinction event, has been widely studied so far in shallow-water, carbonate successions, whereas its deep-water record remains insufficiently known. The aim of this research is to reconstruct the sedimentary environments and the palaeoredox conditions in the axial part of the Baltic-Podolian Basin during the event. For these purposes, the Pasłęk IG-1 core section has been examined using microfacies analysis, framboid pyrite diameter and carbon isotope measurements. The prelude to the event records an increased influx of detrital dolomite interpreted as eolian dust, coupled with a pronounced decrease in the diameter of the pyrite framboids, indicating persistent euxinic conditions across the event. The event climax is recorded as the Reda Member and consists of calcisiltites, composed of calcite microcrystals (‘sparoids’), which are interpreted as suspensoids induced by phytoplankton blooms in the hipersaturation conditions present in the epipelagic layer of the basin. Both the prelude and climax facies show lamination, interpreted as having resulted from periodical settling of marine snow, combined with hydraulic sorting within a ‘benthic flocculent layer’, which additionally may be responsible for a low organic matter preservation rate due to methanogenic decomposition. Contrary to the observed basinward CIE decline in the benthic carbonates in the basin, the Reda Member records an extremely positive CIE (up to 8.25‰). Given the pelagic origin of the sparoids, the CIE seems to record surface-water carbon isotope ratios. This points to a large carbon isotope gradient and kinetic fractionation between surface and bottom waters during the mid-Ludfordian event in a strongly stratified basin. The Reda facies-isotope anomaly is regarded as undoubtedly globally triggered, but amplified by the stratified and euxinic conditions in the partly isolated, Baltic-Podolian basin. Hence, the common interpretation of the basin record as representative for the global ocean needs to be treated with great caution.
Jurassic and Lower Cretaceous successions of the Manín Unit of the Central Western Carpathians are exposed in Butkov Quarry in the Middle Váh Region, Slovakia. A significant part of the macrofauna belonging to neocomitid ammonites, formerly classified under the genus Teschenites Thieuloy, 1971, occurs in deposits spanning the Valanginian/Hauterivian boundary. The original definition of Teschenites was accompanied by uncertainties in the taxonomic and stratigraphic position of its original type species, i.e., Hoplites neocomiensiformis Uhlig, 1902. The present contribution focuses on and provides a possible taxonomic solution by establishing the new genus Tescheniceras. In Butkov Quarry, the new genus includes five species. Tescheniceras flucticulum (Thieuloy, 1977), the type species, is the most abundant. Tescheniceras callidiscum (Thieuloy, 1971), the subzonal species for the uppermost Valanginian (Thieuloy 1971b), occurs only sporadically. Because Acanthodiscus radiatus (Bruguiére, 1789), the index species for the basal Hauterivian (radiatus Zone) in the international ammonite zonation, does not occur in the locality, the basal Hauterivian is indicated by the first appearance of the genus Spitidiscus Kilian, 1910.
Editorial Team
Editor-in-Chief
Piotr Łuczyński, Faculty of Geology, University of Warsaw, Żwirki i Wigury Str. 93, PL-02-089 Warszawa, Poland
Editors
Piotr Łuczyński, Faculty of Geology, University of Warsaw, Żwirki i Wigury Str. 93, PL-02-089 Warszawa, Poland
Anna Żylińska, Faculty of Geology, University of Warsaw, Żwirki i Wigury Str. 93, PL-02-089 Warszawa, Poland
Assistant Editors
Bogusław Bagiński, Faculty of Geology, University of Warsaw, Żwirki i Wigury Str. 93, PL-02-089 Warszawa, Poland
Andrzej Konon, Faculty of Geology, University of Warsaw, Żwirki i Wigury Str. 93, PL-02-089 Warszawa, Poland
Ewa Krogulec, Faculty of Geology, University of Warsaw, Żwirki i Wigury Str. 93, PL-02-089 Warszawa, Poland
Editorial Board
Zdzisław Bełka, Isotope Laboratory, Adam Mickiewicz University, Krygowskiego Str. 10, PL-61-680 Poznań, Poland
Olaf Elicki, Geological Institute, TU Bergakademie Freiberg (Freiberg University), Bernhard-von-Cotta Str. 2, 09599 Freiberg, Germany
Jerzy Fedorowski, Institute of Geology, Adam Mickiewicz University, Krygowskiego Str. 12, PL-61-680 Poznań, Poland
Peter J. Harries, NC State University, 1020 Main Campus Drive, Raleigh, NC 27695-7102, United States
John W.M. Jagt, Natuurhistorisch Museum Maastricht, de Bosquetplein 6, NL-6211 KJ Maastricht, Netherlands
William James Kennedy, Oxford University, Museum of Natural History, Parks Road, OX1 3PW Oxford, United Kingdom
Jacek Matyszkiewicz, Faculty of Geology, Geophysics and Environmental Protection, AGH University of Science and Technology, Mickiewicza Str. 30, PL-30-059 Kraków, Poland
Stanislaw Mazur, Institute of Geological Sciences, Polish Academy of Sciences, Senacka Str. 1, PL-31-002 Kraków, Poland
Jozef Michalik, Earth Science Institute, Slovak Academy of Sciences, Dúbravská cesta Str. 9, SK-840-05, Bratislava, Slovakia
Anatoly Mikhailovich Nikishin, Moscow State University, Department of Geology, 117234 Moscow B-234, Russian Federation
Nestor Oszczypko, Institute of Geological Sciences, Jagiellonian University, Gronostajowa Str. 3a, PL-30-387 Kraków, Poland
Grzegorz Racki, Faculty of Earth Sciences, University of Silesia, Będzińska Str. 60, PL-41-200 Sosnowiec, Poland
Ewa Słaby, Institute of Geological Sciences, Polish Academy of Sciences, Twarda Str. 51/55, PL-00-818 Warszawa, Poland
Michał Szulczewski, Faculty of Geology, University of Warsaw, Żwirki i Wigury Str. 93, PL-02-089 Warszawa, Poland
Susan Turner, Queensland Museum, 122 Gerler Rd., Hendra 4101, Queensland, Australia
Alfred Uchman, Institute of Geological Sciences, Jagiellonian University, Gronostajowa Str. 3a, PL-30-387 Kraków, Poland
Ireneusz Walaszczyk, Faculty of Geology, University of Warsaw, Żwirki i Wigury Str. 93, PL-02-089 Warszawa, Poland
Markus Wilmsen, Senckenberg Naturhistorische Sammlungen Dresden, Museum für Mineralogie und Geologie, Königsbrücker Landstr. 159, D-01109 Dresden, Germany
Andrzej Ryszard Żelaźniewicz, Institute of Geological Sciences, Polish Academy of Sciences, Podwale Str. 75, PL-50-449 Wrocław, Poland
Institute of Geology
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