... 城郊经济 suburb economy 中晚泥盆世 middle and upper devonian 中晚泥盆世 middle-late devonian ...
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The lead-zinc deposits occur in the Lower Silurian Meiziya Formation, Middle Silurian Shuanghezhen Formation, Middle Devonian Dafenggou Formation and Upper Devonian Nanyangshan Formation.
铅锌矿赋存于下志留统梅子垭组、中志留统双河镇组及中泥盆统大枫沟组、上泥盆统南羊山组；
The iron bearing formations mainly occur in the Middle and , especially, Upper Devonian strata.
含矿建造主要赋存于中上泥盆统 ，而以上泥盆统为主。
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