Publisher © Czech Geological Survey, ISSN: 2336-5757 (online), 0514-8057 (print)
Micropalaeontological (palynomorphs) investigation of the upper coal seam in the Bílina delta area (North Bohemia, Miocene)
AbstractUpper part of the mined coal seam (mine Bílina) has been examined in its palynonomorph components and microdebris in both qualitative and quantitative analyses. The results have shown the swamp coniferous group of the Taxodiaceae-Cupressaceae (including Glyptostrobus) as dominating autochthonous element of the basin. The deciduous trees of Ulmus, Zelkova and Alnus occur frequently, with prevalence of Alnus represented by four- to six-porate pollen. Tiliaceae occur as single finds only, in contrast to the other sites/profiles in the basin. Palms of Arecipites-type are still present in the assemblage but rather infrequently. Single finds of the other taxa are involved separately in the text. They comprise Magnolia, Carpinus, Ostrya, Carya, cf. Carya, Juglandaceae (coryphaeus-types), Celtis, aff. Myrica, Symplocos, Cercidiphyllum, cf. Platanaceae (Tricolporopollenites ipelensis-type), Nyssa, Fagus, Castanea, Castaneoideae, Tricolporopollenites cf. cingulum, Tricolpopollenites liblarensis, Hamamelidaceae, Salix, Salicaceae-Oleaceae, cf. Parthenocissus - Tricolporopollenites marcodurensis, Ilex, ?Mahonia, Ericaceae, Chenopodipollis multiplex, Gramineae, Potamogeton, Sparganiaceae-Potamogetonaceae, cf. Trapa, Ephedra, ferns of Polypodiaceae, Lygodium and Osmunda. Among pollen, partisles the higher occurrence of the Platycarya and Engelhardia can be mentioned, in relation to the previous research of the seam profile. Symplocos is represented by the low and stable occurrence as in the other parts of the basin (Konzalová 1976). Different pollen of Fagaceae grouped partly under the Rhoipites -Tricolporopollenites pseudocingulum - types have been numerous at several levels and testify the widespread fagaceous elements with predomination of non Fagus types. The Pseudocingulum group comprises probably the deciduous and evergreen trees of both, the humid and dryer habitats of different environments as indicate the accompanying taxa. Gramineae - Graminidites sp., cf. Umbellifereae, hydrophytes with floating leaves, Botryoccocus coenobia, algal colonies, cyanobacterial and algal cysts and different invertebrate remains were revealed. Some of the planktonic organisms display tolerance to the higher Na+ environment. This matched with the occurrence of Ephedra in the assemblage. Very remarkable phenomenon are the zoo-microremains involving different fragments and even the whole microorganisms of invertebrates.