摘要
据对大豁落山群的叠层石组合特征,及其与国内外相应层位的对比研究,提出将北山地区大豁落山群上岩组置于我国震旦系冰碛层之下部层位,时代相当于1978年苏联在里菲界顶部建立的库达什系,同位素年龄上界为650-680±20 Ma,下界为700-720 Ma。其下岩组属青白口系。
The stromatolites studied here are collected from the Dahuoluoshan Group in Beishan district, Gansu Province. According to the feature of the stromatotite assemblage in this region and vertical distribution in the world,middle and upper lithostrate units of the Dahuoluoshan Group can be assigned to the horizon lying under the Sinian moraine in China,approximately corresponding to the Kudashi system of Riphean in USSR(about 650-720Ma in age).
