The Meso-and Neoproterozoic section of Jixian in Tianjin, China is highly worthy of integrated re-search, in which the Yangzhuang Formation takes the role of linking the old and new strata.

• 摘要天津蓟县中、新元古界剖面具有极高的综合研究价值，而杨庄组在该剖面中居于承上启下的位置。