The lower Cambrian succession in the Jiaobang section, Jianhe County, eastern Guizhou, China, includes, in ascending order, the Bianmachong, Balang, and Tsinghsutung formations, with a total thickness of about 645 m. Twenty-six morphological genera (including one new genus) are identified from the Balang and the underlying Bianmachong formations, many of which are common and widely distributed. Six acritarch assemblages are discerned in the Balang Formation. They are, in ascending order, the Adara alea‒Skiagia ornata, the Acrum radiale‒Pterospermella velata, the Comasphaeridium molliculum‒Solisphaeridium baltoscandium, the Corrugasphaera perfecta n. sp.‒Pterospermella vinctusa n. sp., the Acrum novum‒Heliosphaeridium oligum, and the Acrum membranosum‒Adarve diafanum acritarch assemblages. An obvious change of organic-walled microfossil assemblages occurred in the interval between 84 m and 98 m from the bottom of the Balang Formation which roughly corresponds to the boundary between the Oryctacarella duyunensis trilobite Zone and the overlying Arthricocephalus chauveaui trilobite Zone. In addition, organic-walled microfossils are scarce in about 24 m thick from the bottom of the Balang Formation. One new genus and five new species including Plagasphaera balangensis n. gen. n. sp., Asteridium tubulus n. sp., Cymatiosphaera spina n. sp., Corrugasphaera perfecta n. sp., and Pterospermella vinctusa n. sp. are described.

贵州省东部剑河县交浜剖面下寒武统层序依次为扁马冲组、巴朗组和清苏通组，总厚度约645 m。从巴朗及其下伏变马冲组中鉴定出26个形态属（包括1个新属），其中许多属常见且分布广泛。在巴朗组中发现了六个 acritarch 组合。它们按升序依次为Adara alea-Skiagia ornata、Acrum Radie-Pterospermella velata、Comasphaeridium molliculum-Solisphaeridium baltoscandium、Corrugasphaera perfecta n。sp. ‒Pterospermella vinctusa n. sp.，Acrum novum ‒ Heliosphaeridium oligum和Acrum membranosum ‒ Adarve diafanum acritarch 组合。距巴朗组底部84 m～98 m的有机壁微化石组合发生了明显的变化，大致对应于Oryctacarella duyunensis三叶虫带与上覆的Arthricocephalus chauveaui三叶虫带的边界。此外，距巴朗组底部约 24 m 厚的有机壁微化石稀少。Plagasphaera balangensis n.等1个新属和5个新种。将军 n. sp., Asteridium tubulus n. sp., Cymatiosphaera spina n. sp.,Corrugasphaera Perfecta n. sp., 和Pterospermella vinctusa n. sp. 被描述。