Record details

    Graptolites, stratigraphy and depositional setting of the middle Llandovery (Silurian) volcanic-carbonate facies at Hýskov (Barrandian area, Czech Republic)
Statement of responsibility
    Petr Štorch
    Štorch, Petr
Source title - serial
    Věstník Českého geologického ústavu (Bulletin of the Czech Geological Survey)
    Vol. 76, no. 1
    p. 55-76
    7 obr., 3 fot., 4 pl., 2 s.bibl.
    České resumé
    Zkr. název ser.: Věst. Čes. geol. Úst. (Bull. Czech geol. Surv.)
Subject group
    nový taxon
    pražská pánev
    prostředí mělkovodní
    zóny biostratigrafické
Geographical name
    Hýskov (Beroun)
    Železná (Beroun)
Abstract (in english)
   A graptolite assemblage comprising 13 species, and assigned to the lower to lowermost part of the Stimulograptus sedgwickii Biozone (middle Llandovery), is described from a tectonic block of volcanic-carbonate facies preserved along the Prague Fault at Hýskov near Beroun. The assemblage is considered to be a low-diversity relic fauna surviving the late convolutus (and/or early sedgwickii) extinction event. Pseudorthograptus insectiformis, Pristiograptus regularis solidus and Campograptus lobiferus cf. harpago, are the last survivors of the convolutus Biozone fauna. Petalolithus clandestinus sp.n. is confined to this level. Other species, namely Parapetalolithus praecedens?, Neolagarograptus tenuis, S. sedwickii, Pristiograptus cf. variabilis and Torquigraptus magnificus, belong to the newly developing sedgwickii Biozone fauna.
   The graptolites are associated with a high diversity brachiopods-trilobite benthic fauna (Aegironetes-Aulacopleura Community) in which also dendroids, gastropods, tabulate and rugose corals, crinoids, bryozoans, conulariids and ostracods are common. Biostratigraphic correlation suggests that the sudden appearance of shallow-water limestones (grainstones, packstones and lime mudstones) and bottom dwelling fauna in the otherwise anoxic, black-shale dominated lower Silurian of peri-Gondwana Europe may be explained by rapid growth of local submarine volcano, simultaneous with eustatic sea-level fall
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
Entered date
    4. 7. 2007
Import date
    8. 8. 2012