The Yuzhou Flora of the southern North China Platform possesses the typical regional features of the Middle and Late Cathaysian Flora.For a long time during the Permian,this area was located on shoreline marine tidal ...The Yuzhou Flora of the southern North China Platform possesses the typical regional features of the Middle and Late Cathaysian Flora.For a long time during the Permian,this area was located on shoreline marine tidal flats and deltas at low latitudes with a warm and humid climate.Consequently,many successive layers with abundant well-preserved plant fossils and a complete evolutionary sequence were developed.This is a unique and ideal place to study the Middle and Late Cathaysian Flora.We have recognized 111 genera and 307 species from this flora.The rapid morphological evolution and uninterrupted stratigraphic succession of Lobatannularia(Sphenophytes) make this group one of the bases for biostratigraphic divisions of the Permian System of the North China Platform.Ninety percent of Pteridophytes belong to the order Marattiales,which are well developed during the early and middle stages of the Yuzhou Flora but experience a sudden decline during the late stage.Ancient Pteridospermatophytes only flourished during the Middle Permian whereas advanced Peltaspermales are extremely well developed at the end of the early Late Permian.Among them Shenzhouphyllum is one of characteristic elements in the late stage of the Yuzhou Flora.The Cycadophytes evolved relatively early in this area and they differentiated and proliferated during the late Middle to early Late Permian.The number of species of Ginkgophytes is small but this group is extremely abundant,especially in the early Late Permian.The Gigantopteridales(preangiosperms) is a very important and unique group in the Yuzhou Flora.Based upon their venation and leaf architecture,this group can be divided into three evolutionary stages,i.e.,appearance and differentiation,first flourishing,and second flourishing and sudden disappearance,which form the basis for biostratigraphic division and correlation of the Permian System of the North China Platform.Based upon the evolutionary trend of venation pattern and leaf architecture,we propose some taxonomic changes at the generic level.The Yuzhou Flora emerged at the middle Early Permian(Zisongian) and suddenly disappeared at the early Late Permian(Wujiapingian).It is later replaced by the Euro-American Zechstein flora in the late Late Permian.The Yuzhou Flora is divided into three(early,middle and late) stages based upon the cyclic development of its plant groups.Five fossil plant assemblage zones are recognized from the Yuzhou Flora based upon the succession of each group and their combined characters in different layers.展开更多
Roof shale floras help understand the transition of vegetational landscapes from a peat–forming environment to a clastic one, but are seldom investigated in the Cathaysian province（typical present day China and East...Roof shale floras help understand the transition of vegetational landscapes from a peat–forming environment to a clastic one, but are seldom investigated in the Cathaysian province（typical present day China and East Asia）. Here the roof shale flora of Coal Seam 6 from the lower Permian Taiyuan Formation of the Wuda Coalfield, Inner Mongolia, is systematically described and its ecostratigraphic and phytogeographic implications are discussed. The flora is composed of seven plant groups, including Lepidodendrales, Medullosales, Gigantopteridales, Peltaspermales, Noeggerathiales, Cordaitales and Cycadales. Many of these taxa are also documented in Euramerica, and the floral composition indicates a more intimate relationship between Cathaysia and Euramerica during the Cisuralian than previously thought. However, there are few genera and species in common with those of the underlying peat–forming flora. Moreover, the flora is hardly comparable with the commonly known flora of the Taiyuan Formation. Such assemblage differences are very likely due to changes of taphonomic and environmental phases, rather than evolutionary floral succession. For a full and more precise understanding of the floral composition, succession and the floristic discrepancy in different depositional environments, an ecostratigraphic investigation on the Late Palaeozoic of Cathaysia is advocated.展开更多
A lot of well-preserved plants from the Linxi Formation are collected in the Soron area,Inner Mongolia,consisting of 34 species of 16 genera. They are Late Permian in age. The flora is characterized by a lot of Angara...A lot of well-preserved plants from the Linxi Formation are collected in the Soron area,Inner Mongolia,consisting of 34 species of 16 genera. They are Late Permian in age. The flora is characterized by a lot of Angaran plants,such as Paracalamites,Comia,Rhachiphyllum,Iniopteris,Rufloria,etc. Some Cathaysian elements,such as Lobatannularia lingulata,L. multifolia,Fascipteris Cathaysiantus,F. densata,Taeniopteris szei,Cladophlebis liulinensis and C. permica,are also mixed within the present flora. This indicates that the Soron of Inner Mongolia was located in the sector between the Angaran and Cathysian floristic provinces in Lopingian. It is beneficial for depicting the location and the evolution of the Solenker--Xar Moron suture zone in the phytogeographic view. The transmigration of tropical and subtropical Cathaysian plants to the north indicates that the Paleoasian Ocean was closed during the late Permian along the suture zone.展开更多
基金supported by the 2012 National Rock,Mineral and Fossil Specimen Resource Sharing Program of National Science & Technology Infrastructure of ChinaNational Natural Science Foundation of China(Grant Nos. 48970070 and 49472075)
文摘The Yuzhou Flora of the southern North China Platform possesses the typical regional features of the Middle and Late Cathaysian Flora.For a long time during the Permian,this area was located on shoreline marine tidal flats and deltas at low latitudes with a warm and humid climate.Consequently,many successive layers with abundant well-preserved plant fossils and a complete evolutionary sequence were developed.This is a unique and ideal place to study the Middle and Late Cathaysian Flora.We have recognized 111 genera and 307 species from this flora.The rapid morphological evolution and uninterrupted stratigraphic succession of Lobatannularia(Sphenophytes) make this group one of the bases for biostratigraphic divisions of the Permian System of the North China Platform.Ninety percent of Pteridophytes belong to the order Marattiales,which are well developed during the early and middle stages of the Yuzhou Flora but experience a sudden decline during the late stage.Ancient Pteridospermatophytes only flourished during the Middle Permian whereas advanced Peltaspermales are extremely well developed at the end of the early Late Permian.Among them Shenzhouphyllum is one of characteristic elements in the late stage of the Yuzhou Flora.The Cycadophytes evolved relatively early in this area and they differentiated and proliferated during the late Middle to early Late Permian.The number of species of Ginkgophytes is small but this group is extremely abundant,especially in the early Late Permian.The Gigantopteridales(preangiosperms) is a very important and unique group in the Yuzhou Flora.Based upon their venation and leaf architecture,this group can be divided into three evolutionary stages,i.e.,appearance and differentiation,first flourishing,and second flourishing and sudden disappearance,which form the basis for biostratigraphic division and correlation of the Permian System of the North China Platform.Based upon the evolutionary trend of venation pattern and leaf architecture,we propose some taxonomic changes at the generic level.The Yuzhou Flora emerged at the middle Early Permian(Zisongian) and suddenly disappeared at the early Late Permian(Wujiapingian).It is later replaced by the Euro-American Zechstein flora in the late Late Permian.The Yuzhou Flora is divided into three(early,middle and late) stages based upon the cyclic development of its plant groups.Five fossil plant assemblage zones are recognized from the Yuzhou Flora based upon the succession of each group and their combined characters in different layers.
基金supported jointly by the Strategic Priority Research Program (B) of of Chinese Academy of Sciences (XDB18000000)the National Natural Science Foundation of China (Grant Nos.41372011,41472005 and 41530101)
文摘Roof shale floras help understand the transition of vegetational landscapes from a peat–forming environment to a clastic one, but are seldom investigated in the Cathaysian province（typical present day China and East Asia）. Here the roof shale flora of Coal Seam 6 from the lower Permian Taiyuan Formation of the Wuda Coalfield, Inner Mongolia, is systematically described and its ecostratigraphic and phytogeographic implications are discussed. The flora is composed of seven plant groups, including Lepidodendrales, Medullosales, Gigantopteridales, Peltaspermales, Noeggerathiales, Cordaitales and Cycadales. Many of these taxa are also documented in Euramerica, and the floral composition indicates a more intimate relationship between Cathaysia and Euramerica during the Cisuralian than previously thought. However, there are few genera and species in common with those of the underlying peat–forming flora. Moreover, the flora is hardly comparable with the commonly known flora of the Taiyuan Formation. Such assemblage differences are very likely due to changes of taphonomic and environmental phases, rather than evolutionary floral succession. For a full and more precise understanding of the floral composition, succession and the floristic discrepancy in different depositional environments, an ecostratigraphic investigation on the Late Palaeozoic of Cathaysia is advocated.
基金Supported by China Geological Survey ( Grant Nos. 1212011120966,1212011121086)the Key Lab for Evolution of Past Life and Environment in NE Asia,Ministry of Education,China( Jilin Univ. )
文摘A lot of well-preserved plants from the Linxi Formation are collected in the Soron area,Inner Mongolia,consisting of 34 species of 16 genera. They are Late Permian in age. The flora is characterized by a lot of Angaran plants,such as Paracalamites,Comia,Rhachiphyllum,Iniopteris,Rufloria,etc. Some Cathaysian elements,such as Lobatannularia lingulata,L. multifolia,Fascipteris Cathaysiantus,F. densata,Taeniopteris szei,Cladophlebis liulinensis and C. permica,are also mixed within the present flora. This indicates that the Soron of Inner Mongolia was located in the sector between the Angaran and Cathysian floristic provinces in Lopingian. It is beneficial for depicting the location and the evolution of the Solenker--Xar Moron suture zone in the phytogeographic view. The transmigration of tropical and subtropical Cathaysian plants to the north indicates that the Paleoasian Ocean was closed during the late Permian along the suture zone.
基金This project is supported by the National Foundation of Natural Science and the doctoral degree division foundation from the State Commission of Education
