Abstract New palynological assemblages from the CBM-001-ST-RS borehole, drilled in the Santa Terezinha coalfield, Rio Grande do Sul State are presented. The studied section is composed of the Rio Bonito, Palermo, Irati and Serra Alta formations, Permian units of the Parana Basin. According to the stratigraphic distribution of guide-species and the general composition of the palynological associations, two palynozones are recognized, in ascending order: the Vittatina costabilis (VcZ) and the Lueckisporites virkkiae (LvZ) zones. Differences in the stratigraphic range of specific taxa are observed when compared to those proposed by former palynostratigraphic schemes. Subdivision of the Vittatina costabilis Zone into two subzones is not verified. Multivariate cluster analysis based on the studied material and two other sections from the Rio Grande do Sul State does not allow precise recognition of the aforementioned intervals, corroborating previous related efforts. Considering radiometric datings available for some equivalent levels within the Parana Basin, as well as correlations with other Gondwana palynological associations, an Asselian-Wordian age is suggested for the studied section.

中文翻译：

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巴西冈瓦纳西部巴拉那盆地南部二叠纪剖面的孢粉地层分析

摘要 介绍了在南里奥格兰德州 Santa Terezinha 煤田钻探的 CBM-001-ST-RS 钻孔的新孢粉组合。研究剖面由巴拉那盆地二叠纪单元 Rio Bonito、Palermo、Irati 和 Serra Alta 地层组成。根据引导物种的地层分布和孢粉学协会的一般组成，按升序识别出两个孢粉带：Vittatina costabilis (VcZ) 和 Lueckisporites virkkiae (LvZ) 带。与以前的孢粉地层计划提出的那些相比，可以观察到特定分类群的地层范围的差异。未验证将 Vittatina costabilis 区细分为两个子区。基于研究材料和南里奥格兰德州的另外两个部分的多元聚类分析不允许精确识别上述间隔，证实了以前的相关工作。考虑到巴拉那盆地内某些等效水平可用的辐射测年，以及与其他冈瓦纳孢粉学协会的相关性，建议研究部分采用 Asselian-Wordian 年龄。