The indicative significance of each cluster of V/I ratios and TPI values was specifically elaborated (Fig. 6 ).
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Sequence division and coal facies research methods of the deep No. 8 coal seam in the Daning-Jixian Block, eastern margin of Ordos basin.
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The sentences
The V/I ratios of the MSQ3 show a decreasing trend, which implies that the MSQ3 formed in a sedimentary setting of falling sea level (shallowing water).