罗圈组主要分布在河南省内,其层位介于寒武系与晚前寒武系之间。罗圈组的冰碛成因,首先是杨志坚在一九五八年提出的,其后刘长安,林蔚兴将其命名为罗圈组。这套冰碛地层在华北其它地区多缺失,因此罗圈组成因和时代的研究对华南、华北晚前寒武纪地层的划分和对比有着重要意义。一、罗圈组冰碛岩剖面 The Luozha Formation is mainly distributed in Henan Province, and its horizon lies between Cambrian and Late Precambrian. The cause of the moraine in the circle was first raised by Yang Zhijian in 1958, after which Liu Chang’an and Lin Weixing named it the Luo circle. The moraine strata are often missing in other parts of North China. Therefore, the study on the composition and age of the Loess ring is of great significance to the division and contrast of the Precambrian Cambrian strata in South China and North China. First, the circle group moraine rock section