Flora and dispersed cuticles from the coal seams in the Jan pit of the Šverma coal mine in Žacléř (Bashkirian, Intrasudetic Basin, Czech Republic)

Аннотация

The Lampertice Member in the Žacléř coalfield represents the long-term coal-bearing deposition of nearly all Upper Bashkitian (Namurian to Ducmantian). Nearly the whole thickness, more than 600 m was revealed during the construction of the Jan pit of the Jan Šverma coal mine during 1958–1962. Z. Rieger collected stratigraphically determined plant remains for later evaluation and he also sampled individual coal seams. The plant material was evaluated again and four coal samples were macerated for cuticles to expand our knowledge of Žacléř flora. The following local biozones are valid for the Lampertice Member. The Namutian (Yeadonian) Mariopteris glabra Zone lasts from the basal coal-barren rocks till lower coal seam 17 (there are 24 lower coal seams). The Langsettian is crowed by the LAD of Neuralethopteris schlehanii (Stur) Laveine at upper coal seam 20 (there are 32 upper coal seams). The Langsettian can be divided into the upper and lower parts by FAD of Lonchopteris Brongniart at about lower coal seam 8. The Upper Duckmantian is defined by the FAD of Linopteris neuropteroides Gutbier forma major Potonié from about upper coal seam 11 upwards. The results of cuticular analysis are as follows: Undeterminable cuticles with polygonal or tetragonal, randomly or parallel oriented cells dominate. Such cuticles predominantly belong to seeds. Cordaitalean cuticles are common in three of four samples. They are assigned to the genera Cordaites Unger, Cordaadaxicutis Šimůnek et Florjan, and Cordaabaxicutis Šimůnek et Florjan. Pteridosperm cuticles are very rare—Silesiacutis prosenchymatica Roselt et Schneider and undetermined cuticles with probably neuropterid cyclopterid affinity.