骆家门组砾岩具有冰成特征,如巨大的厚度,无分选的岩性,复杂的砾石成份,具有坠石特征的砾石,以及砾石中的压裂等。砾岩基质中以伊利石为主的粘土矿物组合为寒冷气候带的标志,而粒度参数判别表明该砾岩形成于冰筏—海洋相,地层对比及年代学资料表明它是早震旦世长安冰期的产物。据此对浙北晚前寒武纪地层提出了新的划分方案。 The Luojiamen Formation conglomerates have ice-forming features such as massive thickness, unscreened lithology, complex gravel components, pebbles with pendant features, and fractures in gravel. The illite-dominated clay mineral assemblage in conglomerate matrix is ​​a sign of the cold climatic zone, while the granulometry parameter identification indicates that the conglomerate is formed in the ice-raft-oceanic facies. The stratigraphic correlation and chronological data indicate that it is the early Sinian Chang’an The product of the ice age. Based on this, a new division scheme was proposed for the late Precambrian stratigraphy in northern Zhejiang.