Publisher © Czech Geological Survey, ISSN: 2336-5757 (online), 0514-8057 (print)
Chronostratigraphic revision and paleoclimatic significance of the talus deposit at the foot of the Martinka cliff in the Protected landscape area and Biosphere reserve Pálava (S Moravia)
Abstract
At the foot of the Jurassic limestone cliff a huge talus accumulation has been exposed by erosion. Its sedimentary sequence as well as the incorporated molluscan succession clearly reflexes the paleoclimatic and local environmental development since the Last Glacial maximum. The column of the excavation is apparently divisible into three main sections: 1) the basal loess-like loam with scattered boulders (layer 9), including Pupilla loessica -index fossil of the pleniglacial loess steppe; 2) the middle komplex (laeyers 8-5) of pale greyisch brown loam rich in fine rubble contains predominantly tolerant snail assemblages of the Late Glacial, whereas 3) the upper scree layers with humic matrix are characterized by mass occurrence of a number of forest species indicating the Holocene Climatic Optimum. Early and Late Holocene strata have been removed by erosion. The following events based on malacologic evidence may be stressed: 1) erosional phase between the Early and Middle Holocene - and 2) an impressive moist phase in the early Climatic Optimum documented by such elements as Carychium tridentatum, Vitrea crystallina or Macrogastra ventricosa in an actually xerothermic habitat.
