Record details

    The graptolite, conodont and sedimentary record through the late Ludlow Kozlowskii Event (Silurian) in the shale-dominated succession of Bohemia
    Frýda, Jiří
    Kříž, Jiří
    Manda, Štěpán
    Slavík, Ladislav
    Štorch, Petr
    Tasáryová, Zuzana
Publication type
    článek v periodiku
Source title - serial
    Geological Magazine
    Roč. 149, č. 3
Thesaurus term
    graptolites, conodonts, Silurian, biostratigraphy, Kozlowskii Event, extinction, peri-Gondwana
Abstract (in english)
   The shale-dominated hemipelagic succession exposed in the southwestern part of the Prague Synform preserves the most complete Ludfordian graptolite record so far encountered from peri-Gondwanan Europe. Four graptolite biozones - the Neocucullograptus inexpectatus, Nc. kozlowskii, Pseudomonoclimacis latilobus-Slovinograptus balticus and Pristiograptus fragmentalis biozones - are recognised in the middle and late Ludfordian, between the B. tenuis Biozone and the base of the Přídolí Series. Conodont occurrences are restricted to scattered limestone beds, but enable tentative integration of the graptolite and conodont biozonal schemes. Particular attention was paid to faunal and sedimentary changes and the carbon isotope record across the middle Ludfordian Kozlowskii extinction Event. The Kozlowskii Event caused the almost simultaneous extinction of graptolites with ventrally curved rhabdosomes. The off-shore conodont fauna recorded in the section was not strongly affected and similarly th
   e pelagic orthocerids and nektonic Ceratiocaris passed unaffected through the extinction interval. The late Ludfordian graptolite recovery gave origin to a novel fauna of Přídolí type as taxa that emerged or just reappeared above the Kozlowskii crisis. In Všeradice and elsewhere in the Prague Synform, the recovery, manifested by the appearance of Pseudomonoclimacis latilobus and Slovinograptus balticus, closely postdates the end of the isotope excursion but predates the FA of the conodont index "Ozarkodina"snajdri. The present data demonstrate the coincidence of the graptolite crisis with benthic faunal change and eustatic fall in sea-level manifested by facies change and the carbon isotope excursion.
    Česká geologická služba
Contributor code
    ČGS (RIV)
Source format
Import date
    15. 10. 2014