marl slate
... 泥灰土；泥灰岩；灰泥 marl 泥灰板岩 marl slate 泥灰土 marl(y) soil ...
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泥灰板岩层 marl slate
板状泥灰岩 slate marl
上段以黑灰色（风化后为浅灰色）含硅炭板岩和泥灰质含炭板岩为主。
The upper member of the Lujiaping Formation is mainly dark slate, light gray-green (after weathering) sericitized slate, and silt slate.
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