Dr. Wojciech Krawczyński

    CV:
  • 1990: M.Sc. degree (University of Silesia)
    M.Sc. thesis: Non-silicate minerals in agates from the Płuczki Górne – Pławna deposit (NW Sudetes, Poland).


  • 1999: Ph.D. degree (University of Silesia)
    Ph.D. thesis: Givetian and Frasnian gastropods from the Polish part of the Laurussia shelf.
 
wojtekk@us.edu.pl

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Abstracts:
Krawczyński Wojciech, 2001: Givetian Gastropoda from the Elbingerode Reef Complex (Harz Mountains, Germany). Abhandlungen und Berichte für Naturkunde, 24: 39–67.
    A rich collection of Givetian gastropods from the one locality in the Elbingerode Reef Complex is stored in the Museum für Naturkunde in Magdeburg. The fauna comprises at least 9 taxa, including the new Murchisonia elbingerodensis sp. nov., and 8 species already well known from Givetian beds in the Rhenish Mountains (genera Buechelia, Euryzone, Devonoconica, Paffrathopsis, Hessonia, Turridina, Macrochilina, Murchisonia). Six morphotypes (one new – pseudovicariana) are distinguished within the predominating and enormously variable species Murchisonia bilineata (Dechen, 1832). These gastropods mainly occur in lagoonal massive wackestones (locally completely weathered during Tertiary carstification) together with representatives of Amphipora, bivalves, brachiopods, and ostracods. Consequently, the twin assemblage from Jurkowice-Budy (Holy Cross Mountains, Poland) possibly lived in the low energy peri-reef environments connected with the Givetian Stringocephalus Beds.

Krawczyński Wojciech, 1999: Gastropods from the Givetian and Frasnian of Southern Poland and the global biotic crises. Przegląd Geologiczny, 47(4): 379–383 [in Polish with English summary].
    Stratigraphic distribution patterns are presented for the Givetian and Frasnian gastropods of the Polish segment of southern shelf of Laurussia (Holy Cross Mountains and Cracow areas). The late Givetian is marked by radical impoverishment in gastropods, connected with Taghanic and Manticoceras events. Two smaller extinction events coincide with the transgressive pulses IIc and IId (sensu Johnson i in., 1985). No conclusive data cuold be obtained for the lower Kellwasser event, although possibly it caused demise of gastropods of the Frasnian reefal environments.

Krawczyński Wojciech, Filipiak Paweł & Gwoździewicz Michał, 1997: Fossils assemblage from the Carboniferous sideritic nodules (Wastphalian A) of the NE margin of the Upper Silesia Coal Basin, southern Poland. Przegląd Geologiczny, 45(12): 1271–1274 [in Polish with English summary].
    An assemblage of well preserved fossil invertebrates and plants has been found recently in sideritic nodules at the NE part of the Upper Silesia Coal Basin, on a dump of a coal mine in Sosnowiec. The assemblage consists of xiphosurids (Bellinurus lunatus and Euproops rotundatus), insects (palaeodictyopteran nymph Rochdalia parkeri and wing of Protorthoptera), fragmentary eurypterid carapaces, lycopod cones (Lepidostrobus sp.), and imprints of Lepidodendron and Calamites trunks. The arthropods and terrestial insects are of special value because they are extremely rare in this region. The assemblage originated in poorly oxygenated brackish waters. Similar stands are known from other European and North American coal basins.

Filipiak Paweł & Krawczyński Wojciech, 1996: Westphalian xiphosurans (Chelicerata) from the Upper Silesia Coal Basin of Sosnowiec, Poland. Acta Palaeontologica Polonica, 41(4): 413–425.
    The xiphosurans Bellinurus lunatus (Martin, 1809) and Euproops rotundatus(Prestwich, 1840) are described from sideritic concretions hosted by the Orzesze Beds (Westphalian B) the Załęże Beds (Westphalian A) in the Polish region of the Upper Silesia Coal Basin. Associated flora and fauna include terrestial plant remains and a single palaeodictyopteran insect nimph. As no marine influences are known in this area since the Namurian A, these xiphosurans were probably freshwater organisms.

Krawczyński Wojciech, 1995: Native copper in agates from Rudno near Krzeszowice. Mineralogia Polonica, 26(1): 27–31.
    The occurrence of native copper in agates from Rudno near Krzeszowice was confirmed. It is a rare mineral in these secretions. The chemical composition (low contents of admixtures) proves its crystallization at low hydrothermal temperatures (20–50°C). The relation of copper mineralization to other minerals of the agate paragenesis suggests its secondary origin. The parameters of the copper crystallization were defined as Eh 0.0–0.15 and pH 5.3–7.6 (presuming that the copper was formed in the zone of oxidation). The source of this element might be seen both in the enclosing rock and hydrothermal solutions flowing in the fault zone along the NE boundary of the Nieporaz–Brodła tectonic depresion.


© by W. Krawczyński (2009)