Sedimentary environment of the Lubná coal seam and new palaeobotanical collection from the quarry of the RAKO a.s. company at Lubná near Rakovník (Carboniferous, Kladno-Rakovník Basin)
Abstract
Section of the Lubná coal seam exposed in the quarry near Lubná shows close linkage between peat swamp and lake environment affected by volcanic activity. Lake-swamp environment was replaced by fluvial system with rather shallow perennial meandering channels of generally north direction. Floral assemblage from the new quarry near Rakovník is very poor. It comprise from lycophytes (Lepidodendron acutum and L. worthenii), sphenophytes (Calamites sp.), ferns (Pecopteris aspidioides), pteridosperms (?Dicksoniites irregularis) and cordaitaleans (Cordaites sp. Cardiocarpus sp.). Ferns (Pecopteris aspidioides) are the most common, whereas other groups are rare. The most common are undeterminable plant remains such as fern or pteridosperm rachises and roots of arborescent lycophytes Stigmaria ficoides. Presence of Stigmaria ficoides in many intercalations within the Lubná Coal seem demonstrates numerous hiatuses within this coal seam.