中文摘要：

河南汝州罗圈村白草坪组微体化石丰度大，但分异度低，仅包括具细网状纹饰的Dictyosphaera delicata和具刺饰的Shuiyousphaeridium pilatumsp．nov．以及少量的带藻Taeniatum sp．。虽然化石组成单调，但总体上与山西永济水幽沟剖面和河南渑池麦尽沟剖面白草坪组的疑源类组合面貌一致。目前，此套化石组合的地质时代有中元古代和新元古代早期两种不同的认识，通过对化石形态特征分析以及与苏格兰西北部早新元古代Torridon群中发现的一个微体化石组合的对比，文中暂将汝阳群地质时代置于新元古代早期。

英文摘要：

Large numbers of microfossils -including acritarchs and filamentous algae-have been found recently in Baicaoping Formation shales at the Luoquancun section in Ruzhou, Henan Province, obtained from palynologieal macerations and petrological thin sections. This discovery expands the range of their distribution and has provided new material for detailed study. Although abundant, diversity is low with only three taxa occurring in the material： the reticulate acritarch Dictyosphaera delicata, the spinose acritarch Shuiyousphaeridium pilatum sp. nov. , and an alga-Taeniatum sp. They are similar to acritarch assemblages previously reported from the Shuiyougou and Maijingou sections in the Baieaoping （and Beidajian） formations of the Ruyang Group in Yongji county of Shanxi and Mianchi county of Henan, respectively. Generally the microfossil assemblages have been considered to indicate a Mesoproterozoie or early Neoproterozoic age for the Ruyang Group. According to our morphological analysis and comparison with assemblages from the Torridon Group of northwestern Scotland, we support an early Neoproterozoic rather than Mesoproterozoic age assignment.