The detailed record of diagnostic acritarchs from the volcanosedimentary Vallehondo and Playón formations, bracketed between Cambrian Stage 4 strata bearing the trilobite Serrodiscus and Guzhangian (Miaolingian) beds with Sao aff. Hirsuta, allows the establishment of a fine acritarch-based chronostratigraphy. Seven interval zones are defined by the first successive appearances of cosmopolitan index acritarchs, two in Cambrian Series 2 (Skiagia ciliosa and Heliosphaeridium notatum zones) and five in the Miaolingian (Eliasum llaniscum, Cristallinium cambriense, Adara alea, Timofeevia lancarae and Cristallinium dubium zones). The base of the E. llaniscum Zone, which approximates the first appearance of Acadoparadoxides cf. mureroensis, marks a bioevent close to the base of the Wuliuan Stage, and includes an episode of felsic volcanism in the upper member of the Vallehondo Formation. The Cristallinium cambriense Zone is underlain by rhyolites and ignimbrites previously dated at ca. 505 Ma. The base of the Adara alea Zone concurs with the last felsic volcanic episodes in the Vallehondo Formation here dated at 500. 9 ± 0.9 Ma. The maximum diversification of acritarchs (A. alea–T. lancarae zones) coincides with the onset of basaltic pillow lava flows in the Playón Formation reflecting a major rifting episode. The recognized acritarch-based zonation is applicable to the Acado-Baltic (biogeographic) Province, and reinforces the great value of acritarchs in Miaolingian chronostratigaphy. The new biostratigraphic data confirm the absence of a Furongian record in the study area and the late Drumian–Guzhangian age (A. alea to C. dubium zones) for one of the main syn-rift episodes recorded in the Ossa-Morena Rift.

来自火山沉积的Vallehondo和Playón地层的诊断专家的详细记录，记录在寒武纪第4层地层之间，该地层带有三叶虫Serrodiscus层和具Sao aff的Guzhangian（苗岭）层。Hirsuta允许建立精细的基于准将的年代地层。七个间隔区由世界性指数疑源类，两个寒武纪系列2（第一连续出现定义Skiagia ciliosa和Heliosphaeridium喜草区）和五个在Miaolingian（Eliasum llaniscum，Cristallinium cambriense，阿达拉ALEA，Timofeevia lancarae和Cristallinium柱木区域）。所述的基E. llaniscum区，近似于的第一外观Acadoparadoxides比照 mureroensis，标志着一个接近五六阶段的底部的生物事件，并且在Vallehondo组的上半部包括一次长英质火山活动。该Cristallinium cambriense区由流纹岩和伏之前熔结凝灰岩在约约会 505毫安。阿达拉（Adara）游乐区的底部与这里的Vallehondo组中的最后一次长英质火山相一致，日期为500. 9±0.9 Ma。最大的多元化形式（A. alea – T. lancarae区域）与Playón组中玄武质枕头熔岩流的爆发相吻合，反映出主要的裂谷事件。公认的基于族长的区划适用于阿卡多-波罗的海（生物地理）省，并增强了苗族年代学中族长的巨大价值。新的生物地层数据确认缺席，在研究区芙蓉记录和后期Drumian-Guzhangian年龄（的A. ALEA到C.柱木区）为主体的一个SYN记录在奥萨-莫雷纳裂谷-rift发作。