Record details

    Karbonátové tempestity v barrandienském středním devonu
Statement of responsibility
    Václav Suchý
Other titles
    Carbonate tempestites in the Barrandian Middle Devonian
    Suchý, Václav
Source title - monograph
    Horniny ve vědách o Zemi
    s. 77-105
    9 obr., 4 s.bibl.
    Anglické resumé
Subject group
    pražská pánev
    sedimentace šelfová
    sedimenty karbonátové
    textury sedimentů
Geographical name
    Choteč (Praha-západ)
    Hostim (Beroun)
    Srbsko (Beroun)
Abstract (in english)
   The Choteč Limestone representing the uppermost stratigraphic member of the carbonate development of the Barrandian Devonian was subject of detailed sedimentological study. Limestones comprise centimetre- to decimetre-thick, sheet-like beds of biodetrital limestone rhytmically interbedded with nodular micritic limestone and/or mudstone. Bipolar current marks and scour marks occur on the basal erosion surfaces of biodetrital limestones; their internal structures are hummocky cross strata of various styles, planar and graded laminae, and wave-ripple laminae, with typical lateral and vertical transitions among them. Nearly complete hummocky stratification sequences, which can serve a purpose similar to the Bouma sequence for turbidites, were observed in several units. The depositional environment is interpreted as a shallow-marine shelf periodically influenced by intense tropical or winter storms.
   Lateral transitions from coarse calciruditic limestones into calcisiltic and calcilutic storm layers, observed in a 25 km long SW-NE section of the Barrandian Devonian, demonstrate that these represent a continuous spectrum of genetically related rocks ranging from proximal to distal end members. The proximal to distal trend is expressed in decreasing bed thicknesses, degree of bed amalgamation, grain size, intraclasts and bioclasts content. Such a trend reflects the decreasing effects of storms toward deeper, offshore water and can be used for facies and paleobathymetric analysis
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
Entered date
    31. 3. 2008
Import date
    8. 8. 2012