Late Pennsylvanian vegetation changes in the Donets Basin: syndynamic aspect

The purpose of the article. article is devoted to study one from forms syndynamics in Late Pennsylvanian time, namely phytocoenogenesis. phytocoenogenesis ancient plant communities, i.e., formation new types palaeophytocoenoses, based on research vegetation diversity that reflected ecological-floristic classification phytocoenoses Donets Basin by Brown-Blanquet method. Material and methods. phytocoenogenetic researches consisted analysis changes species syntaxonomic composition cover throughout Pennsylvanian. peculiarities main factors have been identified palaeosyntaxa rank orders following types: wetland forests woodlands coastal lowlands, deltaic plains, seasonally dry river valleys lagoon coasts. palaeophytocoenotic data are fossil assemblages lacustrine, lacustrine-swamp, lacustrine-deltaic, floodplain-lacustrine, floodplain lacustrine-lagoon deposits more than 17 localities 11 boreholes located within Bakhmutska Kalmius-Toretska troughs. Research results. Based processes (progressive regressive development communities) manifestations (formation communities loss old vegetation, three models model proposed. Each reveals relationship between environmental changes. evolution-progression reflects progressive palaeophytocoenoses expressed appearance evolutionary coenopopulations conditions expansion landscape (expanding biotopes). migration-progression conforms as a result migration plants decreasing expanding ones substitution-regression consistent with along structure simplification dominant substitution due contraction certain (decreasing elision-regression decrease number individuals remaining some scientific novelty. For first dynamics (syndynamic) studied. proposed reveal directions evolution give ideas about late Palaeozoic times.