Record details

    Graptolite biostratigraphy of the Lower Silurian (Llandovery) shelf deposits of the Western Iberian Cordillera, Spain
Statement of responsibility
    Juan-Carlos Gutiérrez-Marco = Petr Štorch
    Gutiérrez-Marco, Juan-Carlos
    Štorch, Petr
Source title - serial
    Geological magazine
    Vol. 135, no. 1
    p. 71-92
    9 obr., 1 fot., 3 s.bibl.
    Zkr. název ser.: Geol. Mag.
Subject group
    břidlice černá
    korelace stratigrafická
    prostředí šelfové
    zóny biostratigrafické
Geographical name
    Španělsko-Nová Kastilie
    Velká Británie-Wales
Abstract (in english)
   Eight Lower Silurian graptolite biozones (triangulatus, convolutus, linnaei, turriculatus, crispus, griestoniensis, tullbergi and spiralis) and three subzones (runcinatus-gemmatus, palmeus and hispanicus) have been recognized in the Sierra Menera, Nevera, and Tremedal massifs in the Castilian Branch of the Iberian Cordillera (Western Iberian Cordillera). Early Silurian, Rhuddanian low-diversity normalograptid faunas are present and these, together with the rich graptolite faunas of the Aeronian triangulatus and convolutus biozones, come from black, shaly intercalations within the quartzose sanstones of the upper part of the Los Puertos, Quartzite. Telychian graptolite biozones have been recognized in the succeeding black-shale sequence of the Bádenas Formation. Diachroneity of the transition from sandstone to black shales is dated by graptolites. It range from about the base to at least the top of the linnaei Biozone.
   We suggest that the Lower Silurian black shales of the Western Iberian Cordillera were deposited in a shallow, shelf environment, not much deeper than that of presumably storm-influence sandstones of the Los Puertos Quartzite
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
Entered date
    18. 2. 2008
Import date
    8. 8. 2012