Abstract The Late Triassic radiation of cyst-forming dinoflagellates in the Southern Hemisphere is investigated in the Northern Carnarvon Basin, Western Australia. This major depocentre, situated on the southern margin of the Tethys Ocean, accumulated extensive deltaic and shallow marine successions at this time, that frequently host early dinoflagellate cyst assemblages. Numerous petroleum exploration wells in the basin have penetrated the fluvially dominated Mungaroo Formation and shallow marine Brigadier Formation, of Anisian–Norian and Rhaetian ages, respectively. Consequently, huge numbers of cuttings and sidewall core samples from these northwest prograding deltaic systems are available for study. Many of the dinoflagellate cysts from the Mungaroo and Brigadier formations have not been taxonomically formalised, including many forms that are used in open nomenclature within the oil and gas industry. This study formally documents these occasionally abundant and diverse dinoflagellate cyst assemblages with the aim of providing a consistent taxonomic framework for future work on the Upper Triassic successions of the Northern Carnarvon Basin. This will aid the recognition of individual flooding events via their characteristic palynomorph signatures and help to build on significant recent advances in regional sequence stratigraphy. One new genus, 14 new dinoflagellate cyst species and one new subspecies are described from the most diverse Late Triassic dinoflagellate assemblage yet published. A further nine genera and 15 dinoflagellate species are also recorded from the Carnian–Rhaetian R. wigginsii, W. listeri, H. balmei, R. rhaetica and D. priscum dinoflagellate zones. The documented assemblages are not only significant biostratigraphically, but it is also postulated that high diversity Triassic dinoflagellate cyst associations were paleoclimatically controlled, and were likely confined to the temperate and cool temperate paleolatitudes.

中文翻译：

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来自西澳大利亚卡那封盆地北部的晚三叠世甲藻囊肿

摘要 在西澳大利亚北部卡那封盆地调查了南半球形成包囊的甲藻的晚三叠世辐射。这个主要的沉积中心位于特提斯洋的南缘，此时积累了广泛的三角洲和浅海系列，经常容纳早期的甲藻囊肿组合。盆地内的许多石油勘探井分别钻入了以河流为主的 Mungaroo 组和浅海 Brigadier 组，分别属于 Anisian-Norian 和 Rhaetian 时代。因此，来自这些西北进积三角洲系统的大量岩屑和侧壁岩心样本可供研究。许多来自 Mungaroo 和 Brigadier 地层的甲藻囊肿尚未在分类学上正式化，包括在石油和天然气行业中用于开放命名法的许多形式。本研究正式记录了这些偶尔丰富多样的甲藻囊肿组合，目的是为未来对北卡那封盆地上三叠统系列的研究提供一致的分类框架。这将有助于通过其特征性的孢粉特征识别单个洪水事件，并有助于建立区域层序地层学的最新进展。从迄今发表的最多样化的晚三叠世甲藻组合中描述了一个新属、14 个新甲藻囊肿物种和一个新亚种。另外还记录了 Carnian-Rhaetian R. wigginsii、W. listeri、H. balmei、R. rhaetica 和 D. priscum 甲藻区。记录的组合不仅在生物地层学上具有重要意义，而且还假设高多样性的三叠纪甲藻囊肿组合受古气候控制，并且可能仅限于温带和冷温带古纬度。