Record details

    Shrnutí dosažených dílčích výsledků grantového projektu GA ČR 205/95/1211 "Dynamika vztahů marinního a kontinentálního prostředí"
Statement of responsibility
    Šárka Hladilová
Other titles
    Results of the Project 205/95/1211 "Dynamics of interaction between marine and continental environments"
    Hladilová, Šárka, 1953-
Source title - monograph
    Dynamika vztahů marinního a kontinentálního prostředí - Sborník příspěvků
    s. 169-178
    2 s.bibl.
    Anglické resumé
Subject group
    evoluce biologická
    moravskoslezský devon a spodní karbon
    prostředí kontinentální
    prostředí marinní
    Západní Karpaty
    zpráva o činnosti
Geographical name
Abstract (in english)
   Like in Mesozoic, the evolution of conodonts in the Upper Devonian and Lower carboniferous shows a distinct onshore-offshore trends. The new colonization of mesopelagic habitats came always from the more shallow water environment. All colonizations shows a pronounced onshore-offshore trend. Palmatolepis evolved from shallower Polygnathus, Siphonodella from Alterognathus and Scaliognathus from Eotaphrus or Ligonodina. The vacant niches were after the recovery occupied either by surviving generalists or it seems atractive to accept the idea that progenetic species may have repeatedly evolved to take advantage of resources avaliable only to the juveniles. During extinction intervals of pelagic fauna we can always follow the expansion of shallow water generalists to vacant niches untill new pelagic taxa diversified.
   The increase and decrease trends in conodonts suggest that intrinsic structural factors played an important role in the evolution of mesopelagic conodonts probably more important than environmental factors (Kalvoda). An analysis of the ichnofossils of the Jeseníky Culm has shown that Cruziana, Zoophycos and Nereites ichnofacies can in principle be defined here. The assemblages of the Cruziana ichnofacies show a relation to a highly dynamic environment with periodical supply of the terrigenous material. The Zoophycos ichnofacies is usually less sensitive towards the sediment lithology. But the assemblages of the Zoophycos ichnofacies, with some additional elements of the Nereites ichnofacies, mainly prefer fine laminites rich in caly sediments. The least dynamic, stabilized environments, with significant predominance of fine laminites and clay shales, are typical of the nereites ichnofacies.
   From the ichnofacies analysis of the Jeseníky Culm it is evident that ichnofossils are spread somewhat unequally. Sections with numerous samples alternate with completely sterile sections. In spite of the clear connection between the fossils and the fine-grained sediments it is obvious that ichnofossils were spaced-ori
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
Entered date
    20. 2. 2008
Import date
    8. 8. 2012