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The upper member of the Lujiaping Formation is mainly dark slate, light gray-green (after weathering) sericitized slate, and silt slate. 上段以黑灰色（風(fēng)化後爲(wèi)淺灰色）含矽炭板巖和泥灰質(zhì)含炭板巖爲(wèi)主。