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NEW SPECIES OF THE LOWER—MIDDLE ORDOVICIAN CONODONTS FROM THE TARIM BASIN IN XINJIANG

Zhao Zhixin, Zhibin Huang, Du Pinde, Zhang Gui-zhi, Jinan Xiao, Tan Ze-jin

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Abstract

Ordovician sediments in Tarim Basin can be devided into platform, basin and slope sedimentary facies. Platform facies crop out partly along the north-western margin of Tarim Basin, including Keping and Bachu area, but most of them are covered by the Taklamagan desert in Xinjiang, China. The subsurface sequences have been penetrated by numerous petroleum drill holes, such as North Tarim Basin (LN, YM), central Tarim Basin (TZ), Mazhatag area and so on. The lower Lower—Middle Ordovician consists of limestone alternating with dolomite, the middle-upper Lower—Middle Ordovician consists of limestone and argillaceus limestone containing chert gravel with abundant conodont fossils (11 conodont zones). This article restudies previously described conodont fossils and establishes three new species: Cornuodus ani sp. nov., Erraticodon tarimensis sp. nov. and Trigonodus barnesi sp. nov.

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What this paper is about

Ordovician sediments in Tarim Basin can be devided into platform, basin and slope sedimentary facies. Platform facies crop out partly along the north-western margin of Tarim Basin, including Keping and Bachu area, but most of them are covered by the Taklamagan desert in Xinjiang, China. The subsurface sequences have been penetrated by numerous petroleum drill holes, such as North Tarim Basin (LN, YM), central Tarim Basin (TZ), Mazhatag area and so on. The lower Lower—Middle Ordovician consists of limestone alternating with dolomite, the middle-upper Lower—Middle Ordovician consists of limestone and argillaceus limestone containing chert gravel with abundant conodont fossils (11 conodont zones). This article restudies previously described conodont fossils and establishes three new species: Cornuodus ani sp. nov., Erraticodon tarimensis sp. nov. and Trigonodus barnesi sp. nov.

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Available abstract

Ordovician sediments in Tarim Basin can be devided into platform, basin and slope sedimentary facies. Platform facies crop out partly along the north-western margin of Tarim Basin, including Keping and Bachu area, but most of them are covered by the Taklamagan desert in Xinjiang, China. The subsurface sequences have been penetrated by numerous petroleum drill holes, such as North Tarim Basin (LN, YM), central Tarim Basin (TZ), Mazhatag area and so on. The lower Lower—Middle Ordovician consists of limestone alternating with dolomite, the middle-upper Lower—Middle Ordovician consists of limestone and argillaceus limestone containing chert gravel with abundant conodont fossils (11 conodont zones). This article restudies previously described conodont fossils and establishes three new species: Cornuodus ani sp. nov., Erraticodon tarimensis sp. nov. and Trigonodus barnesi sp. nov.

Key concepts: Ordovician, Conodont, Geology, Tarim basin, Facies, Paleontology, Structural basin, Dolomite

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