Late Triassic coniferous species of silicified woods are described from the Tronquimalal Group, Llantenes Depocenter of the Neuquén Basin, southern Mendoza Province, Argentina. The new species Agathoxylon cozzoi and Agathoxylon lamaibandianus Crisafulli and Herbst, 2011 described in this study were found in proximal volcaniclastic facies deposited in alluvial fans and proximal braided river plains of the Chihuido Formation, which is the basal unit of the Group. The species A. lamaibandianus Crisafulli and Herbst, Protojuniperoxylon ischigualastense (Bonetti, 1966) Bodnar and Artabe, 2007, and the new species Cupressinoxylon llantenesense also described in this study were collected from the upper fluvio-deltaic plain and delta-plain deposits that prograded into a large, meromictic and wedge-shaped lake of the overlying Llantenes Formation. The Tronquimalal Group yields abundant and well-known Triassic plant remains of the Southern Gondwana “Dicroidium Flora,” although it also contains typical early Jurassic taxa displaying age affinities with other Argentinean “Florian Stage” communities of Late Triassic (Norian–?Rhaetian). The lignotaxa described from both units of the Tronquimalal Group may all together represent coniferous forests of the extratropical area of the Southwestern Province of Gondwana. Deciduous conifer forests associated with herbaceous and shrub communities dominated by ferns and smaller corystosperms, and other taxa including the Linguifolium leaves within the Llantenes Depocenter environments, were developed on the western margin of the continent under seasonal temperate-warm and humid to sub-humid climate with a marine influence from the west.

中文翻译：

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阿根廷门多萨省内乌肯盆地 Tronquimalal 群冈瓦纳西南部上三叠统的针叶林

晚三叠世针叶树种的硅化木材来自阿根廷门多萨省南部内乌肯盆地的 Llantenes 沉积中心的 Tronquimalal 群。新物种鱼腥草和龙舌兰本研究中 Crisafulli 和 Herbst，2011 年描述的发现于该群基底单元 Chihuido 组的冲积扇和近端辫状河平原沉积的近端火山碎屑相。物种一种.拉迈班迪亚努斯Crisafulli 和 Herbst，原桧木过氧木(Bonetti, 1966) Bodnar 和 Artabe, 2007，以及新物种柏木木兰本研究还描述了从上游河流三角洲平原和三角洲平原沉积物收集到的沉积物，这些沉积物前进到上覆 Llantenes 组的一个大的、meromictic 和楔形湖。Tronquimalal Group 出产丰富且著名的南冈瓦纳三叠纪植物遗骸“二环菌属Flora”，尽管它也包含典型的侏罗纪早期分类群，显示出与晚三叠世（Norian-?Rhaetian）的其他阿根廷“弗洛里安阶段”群落的年龄相似性。来自 Tronquimalal 组的两个单位所描述的 lignotaxa 可能都代表了冈瓦纳省西南部温带地区的针叶林。落叶针叶林与草本和灌木群落相关，以蕨类植物和较小的紫花属植物为主，其他分类群包括灵桂Llantenes Depocenter 环境中的叶片发育于大陆西部边缘，处于季节性温带温暖湿润至半湿润气候，受西部海洋影响。