The Jixian Group is the thickest and the most extensive exposed stratigraphic unit of Paleoproterozoic-Mesoproterozoic.
蓟县系是中—上元古界厚度最大、出露最广的地层单位。
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Sandstone is a persistent stratigraphic unit.
海绿石砂岩是一个稳定的地层单元。
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The glauconite sandstone is a persistent stratigraphic unit.
The Precambrian stratigraphic unit has been found and mapped.
发现并填绘出前寒武纪地层单元。
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