原石是黑色、灰黑色薄层条带灰岩，与白色、灰白色条带白云岩形成互层的岩石，黑白相间，俗称“黑白道”。
The original stone is black, colored limestone, thin strip with alternating layers of white, gray stripe dolomite rock, black and white alternate with, commonly known as "dao" black and white.
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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