limestone concretions
... 灰岩坑：doline 灰岩结核：limestone concretions 灰岩沟：karren ...
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结核灰岩 kankar
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太原群灰岩中的燧石结核或条带是在成岩作用阶段经硅质交代成因的。
In limestone of Taiyuan Group, Origin of nodular chert and banded chert is that they had been replaced in diagenesis phase.
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