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Under the control of alluvial-proluvial deposition, Jiujialu Formation consisting of claystone (mudstone) , bauxitic rock, bauxite, ferruginous rock formed in it. 負地形中沉積了由粘土巖、鋁土巖、鋁土鑛、鉄質巖及赤鉄鑛等組成的九架爐組。