内蒙古苏尼特左旗泥鳅河组一段下部产Caudicriodus woschmidti hesperius等牙形刺,时代为Lochkovian(洛赫考夫期)期最早期。泥鳅河组二段最下部产牙形刺Masaraella pandora W new morph,Pandorinellinacf.miae等,时代为Pragian(布拉格期...内蒙古苏尼特左旗泥鳅河组一段下部产Caudicriodus woschmidti hesperius等牙形刺,时代为Lochkovian(洛赫考夫期)期最早期。泥鳅河组二段最下部产牙形刺Masaraella pandora W new morph,Pandorinellinacf.miae等,时代为Pragian(布拉格期)期最早期,或由Lochkovian晚期pandora beta-gilberti带到Pragian期早期的steinachensis带。依据牙形刺确定的泥鳅河组一段—二段的时代为早泥盆世早、中期,即Lochkovian期到Pragian期的沉积。本文还首次确认了Masaraella属在中国的存在,并描述了Masaraella pandora W新的形态型。展开更多
世界泥盆系洛霍考夫阶和布拉格阶牙形刺生物地层有较明显的地理分区性,区域对比较困难,中国缺少连续的布拉格阶与洛霍考夫阶灰岩相剖面,牙形刺生物地层的研究,仍很不完善。广西南宁大沙田剖面是目前所知布拉格阶灰岩最多的剖面,在其下...世界泥盆系洛霍考夫阶和布拉格阶牙形刺生物地层有较明显的地理分区性,区域对比较困难,中国缺少连续的布拉格阶与洛霍考夫阶灰岩相剖面,牙形刺生物地层的研究,仍很不完善。广西南宁大沙田剖面是目前所知布拉格阶灰岩最多的剖面,在其下部发现了牙形刺Eognathodus irregularis,E.nagaolingensis,E.sulcatus mu morphs,Masaraella pandora(Murphy,Matti et Walliser,1981)W morphotype P element,其时代为布拉格期早期,大致相当于北美的Eognathodus irregularis-Gondwania profunda带和欧洲的E.sulcatus带。中布拉格期牙形刺Pseudogondwania kindlei带,还没有确立。晚布拉格期的牙形刺Polygnathus pirenniae带的存在和时限范围也没有在大沙田剖面得到确定。但大沙田剖面那高岭组的时代属布拉格期早期是肯定的。展开更多
A new plant, Zhenglia radiata gen. et sp. nov., from the Posongchong Formation （Early Devonian, Pragian age） of the Wenshan District of southeastern Yunnan Province, China is a small herbaceous lycopsid. The aerial ...A new plant, Zhenglia radiata gen. et sp. nov., from the Posongchong Formation （Early Devonian, Pragian age） of the Wenshan District of southeastern Yunnan Province, China is a small herbaceous lycopsid. The aerial branches divide into foliar and fertile stems. The arrangement of the leaf bases on the stem shows lepidodendroid-like phyllotaxy. Possibly the leaf base bears a ligulate pit. The microphyll consists of a swollen, decurrent base, and an entire, linear lamina. The fertile axis is composed of sporophylls arranged helically, forming a compact area similar to cone-like structure. Each sporophyll consists of a widened lateral extension and a distal lamina. The ovoid-elongate sporangia are attached adaxially on the surface of sporophylls. Based on morphological similarities, especially the undivided microphylls, the style of phyllotaxy, the form of the cone-like structures and sporangia, the new lycopsid Zhenglia radiata is placed in the order Protolepidodendrales and a possible evolutionary relationship with the arborescent lycopsids of the Late Devonian and Carboniferous is considered.展开更多
Fossil plants Hedeia sinica Hao et Gensel 1998, Huia gracilis Wang Ct Hao2001 and Guangnania cuneata Wang et Hao are described from the Lower Devonian Xujiachong Formation,the Qujing district, eastern Yunnan, China. T...Fossil plants Hedeia sinica Hao et Gensel 1998, Huia gracilis Wang Ct Hao2001 and Guangnania cuneata Wang et Hao are described from the Lower Devonian Xujiachong Formation,the Qujing district, eastern Yunnan, China. They contribute to our knowledge of the flora in thisdistrict. Based on the occurrence of common plants (Hedeia, Huia, Guangnania and Zosterophyllumaustralianum) and their horizons, it is proved for the first time that the mid-lower assemblage ofthe Xujiachong flora is comparable with the Early Devonian ((late) Pragian) Posongchong flora ofsoutheastern Yunnan and the upper Baragwanathia flora of Australia. In view of this fact and thestratigraphic sequence, the mid-lower part of the Xujiachong Formation is considered to be of (late)Pragian age. Through comprehensive analyses of plant, bivalve and fish assemblages and thelithology, the upper part of the Xujiachong Formation is dated to he of early Emsian age. TheXujiachong flora belonged to the northeastern Gondwana palaeophytogeographic unit during the EarlyDevonian. The early Emsian assemblage of this flora inherited the characters of the Posongchongflora and also exhibited the endemic elements. Belonging to different phytogeographic units, theXujiachong and Posongchong floras differ from the coeval flora of the Laurussian palaeocontinent.The Xujiachong flora is comparatively simple in composition, while the Posongchong flora hasabundant and highly diversified endemics. The disparity between them has resulted from the differentenvironments.展开更多
The age of the Yukiang （Yujiang） Formation has been shrouded in controversy for more than 75 years. New investigation at the Liujing section, Hengxian County, Guangxi, has revealed a conodont sequence assignable to ...The age of the Yukiang （Yujiang） Formation has been shrouded in controversy for more than 75 years. New investigation at the Liujing section, Hengxian County, Guangxi, has revealed a conodont sequence assignable to two Early Devonian conodont zonations： the Eognathodus kindlei？-Polygnathus pireneae Zone and the Polygnathus nothoperbonus Zone from oldest to youngest. The Gaoling and Mahuangling members of the Nahkaoling （Nagaoling） Formation and the overlying Xiayiling Member and lower part of the Shizhou Member of the Yukiang Formation are proven to belong to the Pragian Eognathodus kindlei？-Polygnathus pireneae Zone. The co-occurrence of Polygnathus pireneae and Pol. sokolovi in the lower part of the Shizhou Member demonstrates that this interval can be approximately correlated with the uppermost part of the Polygnathus pireneae Zone. However, precise level identification of the Pragian-Emsian Boundary （PEB） in the Liujing section remains dfficult due to the scarcity of suitable limestone samples for conodont analysis from the middle and upper parts of the Shizhou Member. The Daliancun and Liujing members of the Yukiang Formation and the lower part of the overlying Moding Formation are assigned to the Polygnathus nothoperbonus Zone with the nominal species of this biozone ranging from the bottom of the Daliancun Member to the lower part of the Moding Formation.展开更多
文摘内蒙古苏尼特左旗泥鳅河组一段下部产Caudicriodus woschmidti hesperius等牙形刺,时代为Lochkovian(洛赫考夫期)期最早期。泥鳅河组二段最下部产牙形刺Masaraella pandora W new morph,Pandorinellinacf.miae等,时代为Pragian(布拉格期)期最早期,或由Lochkovian晚期pandora beta-gilberti带到Pragian期早期的steinachensis带。依据牙形刺确定的泥鳅河组一段—二段的时代为早泥盆世早、中期,即Lochkovian期到Pragian期的沉积。本文还首次确认了Masaraella属在中国的存在,并描述了Masaraella pandora W新的形态型。
文摘世界泥盆系洛霍考夫阶和布拉格阶牙形刺生物地层有较明显的地理分区性,区域对比较困难,中国缺少连续的布拉格阶与洛霍考夫阶灰岩相剖面,牙形刺生物地层的研究,仍很不完善。广西南宁大沙田剖面是目前所知布拉格阶灰岩最多的剖面,在其下部发现了牙形刺Eognathodus irregularis,E.nagaolingensis,E.sulcatus mu morphs,Masaraella pandora(Murphy,Matti et Walliser,1981)W morphotype P element,其时代为布拉格期早期,大致相当于北美的Eognathodus irregularis-Gondwania profunda带和欧洲的E.sulcatus带。中布拉格期牙形刺Pseudogondwania kindlei带,还没有确立。晚布拉格期的牙形刺Polygnathus pirenniae带的存在和时限范围也没有在大沙田剖面得到确定。但大沙田剖面那高岭组的时代属布拉格期早期是肯定的。
基金This work was supported by the National Natural Science Foundation of China （No. 40232019 No. 40302001）.
文摘A new plant, Zhenglia radiata gen. et sp. nov., from the Posongchong Formation （Early Devonian, Pragian age） of the Wenshan District of southeastern Yunnan Province, China is a small herbaceous lycopsid. The aerial branches divide into foliar and fertile stems. The arrangement of the leaf bases on the stem shows lepidodendroid-like phyllotaxy. Possibly the leaf base bears a ligulate pit. The microphyll consists of a swollen, decurrent base, and an entire, linear lamina. The fertile axis is composed of sporophylls arranged helically, forming a compact area similar to cone-like structure. Each sporophyll consists of a widened lateral extension and a distal lamina. The ovoid-elongate sporangia are attached adaxially on the surface of sporophylls. Based on morphological similarities, especially the undivided microphylls, the style of phyllotaxy, the form of the cone-like structures and sporangia, the new lycopsid Zhenglia radiata is placed in the order Protolepidodendrales and a possible evolutionary relationship with the arborescent lycopsids of the Late Devonian and Carboniferous is considered.
基金the Chinese Strafigraphy Project of the Ministry of Science and Technology,China(2001DEA20020-5) the National Natural Science Foundation of China(Grant 49972009).
文摘Fossil plants Hedeia sinica Hao et Gensel 1998, Huia gracilis Wang Ct Hao2001 and Guangnania cuneata Wang et Hao are described from the Lower Devonian Xujiachong Formation,the Qujing district, eastern Yunnan, China. They contribute to our knowledge of the flora in thisdistrict. Based on the occurrence of common plants (Hedeia, Huia, Guangnania and Zosterophyllumaustralianum) and their horizons, it is proved for the first time that the mid-lower assemblage ofthe Xujiachong flora is comparable with the Early Devonian ((late) Pragian) Posongchong flora ofsoutheastern Yunnan and the upper Baragwanathia flora of Australia. In view of this fact and thestratigraphic sequence, the mid-lower part of the Xujiachong Formation is considered to be of (late)Pragian age. Through comprehensive analyses of plant, bivalve and fish assemblages and thelithology, the upper part of the Xujiachong Formation is dated to he of early Emsian age. TheXujiachong flora belonged to the northeastern Gondwana palaeophytogeographic unit during the EarlyDevonian. The early Emsian assemblage of this flora inherited the characters of the Posongchongflora and also exhibited the endemic elements. Belonging to different phytogeographic units, theXujiachong and Posongchong floras differ from the coeval flora of the Laurussian palaeocontinent.The Xujiachong flora is comparatively simple in composition, while the Posongchong flora hasabundant and highly diversified endemics. The disparity between them has resulted from the differentenvironments.
基金funded by the National Natural Science Foundation of China(40872009,41272009,41290260,41303001 and J1210006)
文摘The age of the Yukiang （Yujiang） Formation has been shrouded in controversy for more than 75 years. New investigation at the Liujing section, Hengxian County, Guangxi, has revealed a conodont sequence assignable to two Early Devonian conodont zonations： the Eognathodus kindlei？-Polygnathus pireneae Zone and the Polygnathus nothoperbonus Zone from oldest to youngest. The Gaoling and Mahuangling members of the Nahkaoling （Nagaoling） Formation and the overlying Xiayiling Member and lower part of the Shizhou Member of the Yukiang Formation are proven to belong to the Pragian Eognathodus kindlei？-Polygnathus pireneae Zone. The co-occurrence of Polygnathus pireneae and Pol. sokolovi in the lower part of the Shizhou Member demonstrates that this interval can be approximately correlated with the uppermost part of the Polygnathus pireneae Zone. However, precise level identification of the Pragian-Emsian Boundary （PEB） in the Liujing section remains dfficult due to the scarcity of suitable limestone samples for conodont analysis from the middle and upper parts of the Shizhou Member. The Daliancun and Liujing members of the Yukiang Formation and the lower part of the overlying Moding Formation are assigned to the Polygnathus nothoperbonus Zone with the nominal species of this biozone ranging from the bottom of the Daliancun Member to the lower part of the Moding Formation.
