Numerous new records of Ferganiella, Podozamites, and Schidolepium, including a new species, Ferganiella ivantsovii sp. nov., are described from the Early Jurassic(Toarcian) Middle Subformation of the Prisayan Formati...Numerous new records of Ferganiella, Podozamites, and Schidolepium, including a new species, Ferganiella ivantsovii sp. nov., are described from the Early Jurassic(Toarcian) Middle Subformation of the Prisayan Formation from the Euro-Sinian paleofloristic region in the Irkutsk Basin, Eastern Siberia, Russia. An analysis of the paleogeographic distribution of Ferganiella and Podozamites shows that both genera were the most diverse and numerous in the East Asian province of the Euro-Sinian region and in the Northern Chinese province of the Siberian region during the Early and Middle Jurassic. These phytochoria were located in the subtropical and temperate subtropical climate zones, which allows us to consider Ferganiella and Podozamites as thermophilic plants, which are important indicators of the Early Toarcian climatic optimum. Their abundance in the Irkutsk Basin thus may indicate Early Toarcian warming;further abundant Schidolepium cones, which produced Araucariacites pollen, typical for Euro-Sinian flora complement the scenario. Thus, the new finds are the first macrofloristic indicators of the Toarcian climatic optimum in the Irkutsk Basin.展开更多
Two new species of Eretmophyllum Thomas are described from the lower(Toarcian)and upper(Aalenian)Prisayan Formation of the Irkutsk Basin,Eastern Siberia,Russia based on distinct morphological and cuticular features of...Two new species of Eretmophyllum Thomas are described from the lower(Toarcian)and upper(Aalenian)Prisayan Formation of the Irkutsk Basin,Eastern Siberia,Russia based on distinct morphological and cuticular features of the leaves that distinguish them from other species of the genus.Eretmophyllum polypapillosum sp.nov.is characterized by the presence of 2-3 papillae on the lower and upper epidermis of ordinary cells.Taphonomically,the leaf burials of E.polypapillosum sp.nov.indicate that it preferred mesophilic forests developed on river terraces and/or low watersheds.Eretmophyllum yershowskiensis sp.nov.is represented exclusively by leaf cuticles extracted by coal maceration,and it probably inhabited the low banks of peat bogs.The presence of the genus Eretmophyllum in the Early Jurassic of France and Eastern Siberia shows that it was already widespread in the territory of Eurasia,distributed from Western Europe to Eastern Siberia.This indicates the possible existence of Eretmophyllum species elsewhere in the Early Jurassic such as Central Asia and Northwest China.展开更多
Leaf fragments of Herbifolia antiqua A.Frolov et Enushchenko gen.et sp.nov.from the Middle Jurassic(Aalenian)of the Irkutsk Coal Basin(Eastern Siberia,Russia)are reported.The following features are characteristic of H...Leaf fragments of Herbifolia antiqua A.Frolov et Enushchenko gen.et sp.nov.from the Middle Jurassic(Aalenian)of the Irkutsk Coal Basin(Eastern Siberia,Russia)are reported.The following features are characteristic of H.antiqua gen.et sp.nov.:the presence of leaf sheaths,linear smooth-edged leaves with parallel venation,anastomoses between the veins,anomocytic stomata,rhomb-shaped ordinary epidermal cells.Such a combination of characters is widespread in modern monocotyledonous plants and is absent in fossil and modern cryptogam and gymnosperms.Due to the lack of evidence of an enclosed ovule in H.antiqua gen.et sp.nov.,we attribute it to a typological angiosperm,based on its unique leaf structure characteristic of monocotyledons.The leaf epidermal structure of Herbifolia gen.nov.is most similar to those of modern Asparagales and Liliales.展开更多
Back in 1980-a lifetime ago now-graduated from universityand took position at the Sputnik Intermational Tourism Bureau in the then Soviet city of Irkutsk.
文摘Numerous new records of Ferganiella, Podozamites, and Schidolepium, including a new species, Ferganiella ivantsovii sp. nov., are described from the Early Jurassic(Toarcian) Middle Subformation of the Prisayan Formation from the Euro-Sinian paleofloristic region in the Irkutsk Basin, Eastern Siberia, Russia. An analysis of the paleogeographic distribution of Ferganiella and Podozamites shows that both genera were the most diverse and numerous in the East Asian province of the Euro-Sinian region and in the Northern Chinese province of the Siberian region during the Early and Middle Jurassic. These phytochoria were located in the subtropical and temperate subtropical climate zones, which allows us to consider Ferganiella and Podozamites as thermophilic plants, which are important indicators of the Early Toarcian climatic optimum. Their abundance in the Irkutsk Basin thus may indicate Early Toarcian warming;further abundant Schidolepium cones, which produced Araucariacites pollen, typical for Euro-Sinian flora complement the scenario. Thus, the new finds are the first macrofloristic indicators of the Toarcian climatic optimum in the Irkutsk Basin.
基金carried out in the framework of the topic of the state task of the Institute of the Earth's Crust,Siberian Branch of the Russian Academy of Sciences(Project No.121042700218-2)this work involved the Centre of Geodynamics and Geochronology equipment at the Institute of the Earth's Crust(Grant No.075-15-2021682)。
文摘Two new species of Eretmophyllum Thomas are described from the lower(Toarcian)and upper(Aalenian)Prisayan Formation of the Irkutsk Basin,Eastern Siberia,Russia based on distinct morphological and cuticular features of the leaves that distinguish them from other species of the genus.Eretmophyllum polypapillosum sp.nov.is characterized by the presence of 2-3 papillae on the lower and upper epidermis of ordinary cells.Taphonomically,the leaf burials of E.polypapillosum sp.nov.indicate that it preferred mesophilic forests developed on river terraces and/or low watersheds.Eretmophyllum yershowskiensis sp.nov.is represented exclusively by leaf cuticles extracted by coal maceration,and it probably inhabited the low banks of peat bogs.The presence of the genus Eretmophyllum in the Early Jurassic of France and Eastern Siberia shows that it was already widespread in the territory of Eurasia,distributed from Western Europe to Eastern Siberia.This indicates the possible existence of Eretmophyllum species elsewhere in the Early Jurassic such as Central Asia and Northwest China.
基金carried out in the framework of the state task topic of the Institute of the Earth’s Crust,Siberian Branch of the Russian Academy of Sciences(Project No.0346-2018-0004)involved the Centre of Geodynamics and Geochronology equipment at the Institute of the Earth’s Crust,Siberian Branch of the Russian Academy of Sciences(Grant No.075-15-2021-682)
文摘Leaf fragments of Herbifolia antiqua A.Frolov et Enushchenko gen.et sp.nov.from the Middle Jurassic(Aalenian)of the Irkutsk Coal Basin(Eastern Siberia,Russia)are reported.The following features are characteristic of H.antiqua gen.et sp.nov.:the presence of leaf sheaths,linear smooth-edged leaves with parallel venation,anastomoses between the veins,anomocytic stomata,rhomb-shaped ordinary epidermal cells.Such a combination of characters is widespread in modern monocotyledonous plants and is absent in fossil and modern cryptogam and gymnosperms.Due to the lack of evidence of an enclosed ovule in H.antiqua gen.et sp.nov.,we attribute it to a typological angiosperm,based on its unique leaf structure characteristic of monocotyledons.The leaf epidermal structure of Herbifolia gen.nov.is most similar to those of modern Asparagales and Liliales.
文摘Back in 1980-a lifetime ago now-graduated from universityand took position at the Sputnik Intermational Tourism Bureau in the then Soviet city of Irkutsk.
