Record details

Title
    Graptolites, stratigraphy and depositional setting of the middle Llandovery (Silurian) volcanic-carbonate facies at Hýskov (Barrandian area, Czech Republic)
Statement of responsibility
    Petr Štorch
Author
    Štorch, Petr
Language
    anglicky
Source title - serial
    Věstník Českého geologického ústavu (Bulletin of the Czech Geological Survey)
Vol./nr.
    Vol. 76, no. 1
Pages
    p. 55-76
Year
    2001
Notes
    7 obr., 3 fot., 4 pl., 2 s.bibl.
    České resumé
    il.
    Zkr. název ser.: Věst. Čes. geol. Úst. (Bull. Czech geol. Surv.)
Subject group
    Barrandien
    benthos
    Graptolithina
    llandovery
    nový taxon
    pražská pánev
    prostředí mělkovodní
    silur
    taxonomie
    zóny biostratigrafické
Geographical name
    ČR-Čechy
    Hýskov (Beroun)
    Železná (Beroun)
Keyword
    Area
    Barrandian
    Czech
    Depositional
    Facies
    Graptolites
    Hýskov
    Llandovery
    Middle
    Republic
    Setting
    Silurian
    Stratigraphy
    Volcanic-carbonate
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
Contributor
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
    U
Entered date
    4. 7. 2007
Import date
    8. 8. 2012