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Analysiss on Palaeocurrent in the Xujiajuan Formation, Xiangshan Group,   Middle Ordovician, in Southern hemas-microsoft-com:office:smarttags" />Helan Mountains hemas-microsoft-com:office:office" />

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In this paper, the palaeocurrent data recorded in directional sedimentary structure were collected for determining the direction of turbidity currents,   the dip of regional slopes in the study area, and the direction of internal wave and internal tide current. The result shows that the palaeocurrent direction of flutes presents a slightly fan-shaped from the north to the south and suggests the direction of turbidity currents, while the palaeocurrent direction of cross beddings are mainly restricted within an elongated zone extending in a NWW—NE direction suggest the direction of internal-wave and internal-tide current.
    

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