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xin jiang nan bu zao shi tan shi ceng kong chong xin zi liao ji qi gu di li yi yi
Pages: 395-402+455-456
Year: Issue:  4
Journal: Acta Micropalaeontologica Sinica

Keyword:  层孔虫晚泥盆世一早石炭世泡沫板古地理意义四射珊瑚床板珊瑚腕足类新疆南部上泥盆统和下石炭统早石炭世早期;
Abstract: This paper deals with the genus Platiferostroma collected for the first time from the Kushanhe Formation of the lower Lower Carboniferous in the southern part of Xinjiang. Here described and figured are 4 species (including 3 new species), namely, Platiferostroma longtangshanense Wang, P. microcystosum Wang sp. nov., P. multibrachiatum Wang sp. nov. and P. xinjiangense Wang sp.nov. Associated with the Platiferostroma are the rugose corals, tabulate corals, bra- chiopods, bivalves and cephalopods, all being members characteristic of lower Lower Carboniferous in Southwest China.On the basis of lithological characteristics and fossil assemblages, the Kushanhe Formation can be subdivided into two subformations.The Lower Subformation mainly consists of greyish-green light grey feld-spar-quartzose sandstone, calcareous sandstone,intercalated with bioclastic limestone, with a thickness of 742 m, yielding abundant brachiopods (Schuchertella ualentinae, S. cf. globosa, Composita megala, C. communis, Cyrtospirifer el. arohiaei, Pty chomaletoechia sp., Leioproauctus? sp., Auonia semicostata, A. inflata, Brachythyris ovalis, etc.), all representing important elements of upper Upper Devonian—lower Lower Carboniferous in Southwest China, together with a few tabulate corals (Kueichowpora sp.).The Upper Subformation is chiefly composed of greyish-black thin-to mo-derately thick-bedded bioclastic limestone, intercalated with muddy, calcareous siltstone as well as carbonaceous sediment, with a thickness of 756 m, yielding rich rugose corals (Neobeichuanophyllum xinjiangense, Beichuanophyllum kushan- heense, B. xinjiangense, B. rhopaloense, B. sp., Pseudouralinia xinjiangensis, P. kushanheensis, Diphyphyllum kushanheense, Dematophyllum xinjiangense,etc.), tabulate corals (Michelinia,Protomichelinia,Cystomichelinia, Syringopora,Kueichowpora, and Chin), bivalves(Sanguinolites), brachiopods(Composita megala, Tenticospirifer sp., Cyrtospirifer sp., C. chaoi vat. kueichowensis, Rugauris inica, Spirifer sp., Neospirifer sp.,Schuchertella sp., Semiproauctus sp., Auonia sp. and Martinia sp. ) and cephalopods (Neocycloceras sp. ). The Stromatoporoids described in this paper all occur in the lower Upper Subformation, among which many members are fossils characteristic of the lower Lower Carboniferous in Guangxi, Guizhou, Sichuan, Hunan, and Gansu as well as in the Newland island of USSR.At present, the Platiferostroma contains 7 species, namely, Platiferostroma hybridium (Dong), P. baijinense Wang, P.longtangshanense Wang, P. magnum Wang, P. gansuense Dong, P. sinense (Dong), and P. yizangense Li. They are mainly distributed in the lower part of the Shizixu and Mengkungao Formations in Guangxi and Hunan, the lower part of the Kolaoho member and the Changtangzi member of the Aikuan stage and the Yiwa Formation in the Diebu Region of Gansu, representing a special type of Labechiida widely developed in the Lower Carboniferous. Therefore, the Kushanhe Formation may belong to early Early Carboniferous in age and its sedimentary environment may be analogous to that of the platform facies.Based on the. distribution of Platiferostroma, rugose corals, tabulate corals and brachiopods, the author infers that the sea water once communicated with each other between the sea area of southern Xinjiang and that of Southwest China, with the transgression direction from east to west, and the sea water passage could be through the Longmenshan of Sichuan and Qilianshan of Gansu to the northern border of the Kunlun mountains.
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