A structure of the ecozone Quadrocladus pachyphyllus... Prilukiella tomiensis of Vyatka stage of Upper Permian

• Main Author: G. N. Sadovnikov
• Format: Article
• Language: Russian
• Published: Sergo Ordzhonikidze Russian State University for Geological Prospecting 2015-08-01
• Series: Известия высших учебных заведений: Геология и разведка
• Subjects: volcanic plateau; trap rocks; vyatka stage; non-marine permian; siberia; ecozone; ecostratigraphic method
• Online Access: https://geology.mgri-rggru.ru/jour/article/view/52
• ISSN: 0016-7762; 2618-8708

An ecozone Quadrocladus pachyphyllus ... Prilukiella (?) tomiensis has been described in the lower part of the Middle Siberia trap volcanics. It differs very much from the underlying coal-bearing deposits with so called “furrowed” Cordaites and significantly differs from the overlying rocks. On the Russian platform it corresponds to the topmost (Chernigov) floristic complex of the Upper Permian Tatarian series. It is not identified reliably in the unsatisfactory chosen standard section of the non-marine GSSP of Triassic. The units of mountain, plain and seaside sedimentation levels are distinguished as coenozones - separate, independent spatial parts of the ecozone. The woody layer is prevailed with: Quadrocladus pachyphyllus, Elatocladus linearis (mountain), Voltzia (?) avamica, Elatocladus linearis, Quadrocladus pachyphyllus (plain), Pseudovoltzia, Quadrocladus borealis, Q. dvinensis, Geinitzia subangarica (seaside). The grassy level of damp slopes is formed by: Acrostichides linnaeaefolius, Cladophlebis lobifera, Madygenia borealis (mountain), Acrostichides linnaeaefolius, А. tunguskanus, Cladophlebis kaoiana, Madygenia borealis, Pursongia beloussovae, Lepidopteris arctica (plain), Schvedopteris lobata, Madygenia, borealis, Phylladoderma aequalis, Р. annulata, Р. rastorguevii, Fefilopteris pilosa (seaside). Dominants of grassy cover of lowlands are Arthropitys prynadae (plain), Pursongia beloussovae, Tatarina (seaside), Paracalamites triassicum.