Abstract The Cacheuta Hill (Precordillera, Mendoza province, Argentina) is a classic locality of the Gondwanan Triassic. In this contribution, new fossil plant records in the Uspallata Group are described, the systematic palaeontology of previously described taxa is revised, and a comprehensive analysis of the Triassic palaeoflora from Cacheuta Hill is undertaken. The studied unit was correlated with other Triassic formations of Gondwana. Our revision of the plant-fossil record from the Uspallata Group provides the first record of the genus Androstrobus (Cycadales) and Odyssianthus (Voltziales) in the Argentinean Triassic; the description of Rissikianthus as a new element of the Cacheuta palaeoflora; the transfer of Baiera rollerii to Rochipteris rollerii; and the presence of Hamshawvia and Stachyopitys in the Argentinean Triassic, confirming the record of these reproductive structures as related to the ginkgoalean lineage. The Potrerillos Formation shows greater similarities with the Carrizal Formation (Argentina) and the Molteno Formation (South Africa). The palaeoflora of the Cacheuta Formation is correlated with that of the Ischigualasto Formation (Argentina) and the Molteno Formation (South Africa). The plant fossil assemblages present in the Uspallata Group at Cacheuta Hill indicate a Late Triassic (Carnian–Norian) age for the unit.

中文翻译：

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阿根廷中西部库约盆地 Cacheuta 山 Uspallata 群（晚三叠世）的新植物化石记录和生物地层分析

摘要 Cacheuta Hill（阿根廷门多萨省Precordillera）是冈瓦南三叠纪的典型产地。在这篇文章中，描述了 Uspallata Group 中新的植物化石记录，修订了先前描述的分类群的系统古生物学，并对来自 Cacheuta Hill 的三叠纪古植物群进行了综合分析。研究的单元与冈瓦纳纪的其他三叠纪地层相关。我们对 Uspallata Group 植物化石记录的修订提供了阿根廷三叠纪 Androstrobus（Cycadales）和 Odyssianthus（Voltziales）属的第一个记录；将 Rissikianthus 描述为 Cacheuta palaeoflora 的一个新元素；Baiera rollii 向 Rochipteris rollii 的转移；以及在阿根廷三叠纪存在 Hamshawvia 和 Stachyopitys，确认这些生殖结构的记录与银杏谱系有关。Potrerillos 组与 Carrizal 组（阿根廷）和 Molteno 组（南非）有更大的相似性。Cacheuta 组的古植物群与 Ischigualasto 组（阿根廷）和 Molteno 组（南非）的相关。Cacheuta Hill 的 Uspallata Group 中存在的植物化石组合表明该单元为晚三叠世（Carnian-Norian）时代。Cacheuta 组的古植物群与 Ischigualasto 组（阿根廷）和 Molteno 组（南非）的相关。Cacheuta Hill 的 Uspallata Group 中存在的植物化石组合表明该单元为晚三叠世（Carnian-Norian）时代。Cacheuta 组的古植物群与 Ischigualasto 组（阿根廷）和 Molteno 组（南非）的相关。Cacheuta Hill 的 Uspallata Group 中存在的植物化石组合表明该单元为晚三叠世（Carnian-Norian）时代。