Record details

    Climatic oscillations versus environmental changes in the interpretation of Tertiary plant assemblages
Statement of responsibility
    Zlatko Kvaček
Other titles
    Climates: Past and Present (Variant.)
    Kvaček, Zlatko, 1937-
Source title - serial
    Geological society special publication
    Vol. 181
    p. 89-94
    5 tab., 29 bibl.
    Zkr. název ser.: Geol. Soc. spec. Publ. (London).
Subject group
    sedimentace fluviolakustrinní
    severočeská pánev
    vulkanity Českého středohoří
    změna klimatu
Geographical name
    Bechlejovice (Děčín)
    Bílina (Teplice)
    Litvínov (Most)
    Suletice (Ústí nad Labem)
Abstract (in english)
   Zonal plant communities are the best climatic indicators because they thrive under specific climatic conditions. However, palaeoclimatic estimates based on mere comparisons of local fossil plant assemblages, even if assessed by multivariate methods, may be misleading, if the taphonomical bias is neglected. The fossil record expressed only limited parts of the vegetation of a given period. The example of the Lower Miocene section at Bílina, North Bohemian basin, showns how quickly the composition of the plant megafossil record changes as a result of different environmental factors and sedimentary setting. These changes can imitate climatic oscillation because swamp, fluvial and upland facies represented within this site have different vegetation-palaeoclimatic aspects. On the other hand, if one compares two assemblages originating from the same sedimentary and environmental setting (preferably mesophytic conditions), the resulting palaeoclimatic changes can be estimated more safely.
   two local assemblages from the Oligocene volcanic area of the České středohoří Mts in North Bohemia are of mesophytic character. Both are embedded in diatomites deposited in crater-maar lakes. the assemblages of Suletice (20-29 Ma), with prevailing thermophilous elements, indicates more warm-temperature conditions, whereas the assemblage of Bechlejovice (27 Ma), composed mostly of deciduous broadleaved trees and shrubs, corresponds to a temperate climate. Thus, together, these two floral assemblages suggest that a climatic oscillation occurred within Late Oligocene time in Central Europe
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
Entered date
    28. 3. 2008
Import date
    8. 8. 2012