元古界（the Proterozoic Erathem）是指元古代形成的地层，属年代地层单位，符号Pt。
n. Proterozoic ; Algonkian
本文进一步提出了蓟县地区中元古界雾迷山组中存在着风暴沉积的证据。
This paper, however, presents evidence of the presence of storm deposits in the middle Proterozoic Wumishan Formation in the Jixian area.
杨庄组在整个中、新元古界剖面中厚度不大，但其岩石类型多样且成因特殊。
The thickness of Yangzhuang Formation is small compared with the whole Proterozoic section, but it has multiple types of rocks with special origins.
燕山地区是中国北方中—上元古界地层最为发育的地区，整个地区露头连续、地层齐全、沉积稳定。
The Yanshan area is the most developed region of the Meso - and Neoproterozoic stratum in north China, the whole area has continuous outcrops, complete stratum and steady deposition.
应用推荐