Premise of research. The early Eocene Laguna del Hunco (LH) fossil site, northwestern Chubut Province, Argentina, holds one of the best-preserved and most diverse paleofloras worldwide. The paleoflora comprises ferns, gymnosperms, and flowering plants. Despite the rapidly growing knowledge of its macrofossil record, little is known about the site’s palynological content. Herein, we present the first dispersed spore-pollen assemblages recovered from LH. Methodology. Palynological samples were collected from seven stratigraphic levels of the Tufolitas de LH (Huitrera Formation), of which six yielded palynomorphs. We determine the botanical affinities of fossil morphotypes and provide systematic descriptions of some taxa. In addition, we establish similarities between LH and other Patagonian Eocene localities, and we compare palynological and prior megafloral records from LH. Pivotal results. We identify 56 spore and pollen species and 28 plant families, of which eight (Cyatheaceae, Schizaeaceae, Polypodiaceae, Asteraceae, Chloranthaceae, Nothofagaceae, Rubiaceae, and Ulmaceae) are reliably reported from the site for the first time. Among other Eocene Patagonian palynofloras, the LH assemblage is similar to Pampa de Jones/Nahuel Huapi Este and Confluencia. Conclusions. The LH spore-pollen assemblages augment the plant fossil record for this significant Eocene locality by incorporating new taxa (e.g., Asteraceae, with one morphotype that represents the oldest record of the family in Patagonia). The new data also reinforce the presence of plant families previously reported from macrofossils, such as Juglandaceae, with pollen grains similar to those of the Engelhardia-Alfaroa group, and Fagaceae (Castaneoideae), complementing the macrofossil record of leaves and reproductive structures.

中文翻译：

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来自阿根廷巴塔哥尼亚 Laguna del Hunco Fossil 湖床的早始新世孢子和花粉组合

研究的前提。早始新世 Laguna del Hunco (LH) 化石遗址位于阿根廷丘布特省西北部，拥有世界上保存最完好、最多样化的古植物群之一。古植物群包括蕨类植物、裸子植物和开花植物。尽管对其大型化石记录的了解迅速增加，但对该网站的孢粉学内容知之甚少。在此，我们展示了从 LH 中回收的第一个分散的孢粉组合。方法。从 Tufolitas de LH（Huitrera 组）的七个地层水平收集孢粉学样品，其中六个产生孢粉形。我们确定化石形态类型的植物学亲和力并提供一些分类群的系统描述。此外，我们建立了 LH 和其他巴塔哥尼亚始新世地区之间的相似性，我们比较了 LH 的孢粉记录和先前的巨花记录。关键结果。我们确定了 56 种孢子和花粉以及 28 个植物科，其中 8 个（茶树科、五花科、息肉科、菊科、金菊科、紫草科、茜草科和榆科）是首次从现场可靠地报道。在其他始新世巴塔哥尼亚孢粉植物群中，LH 组合类似于 Pampa de Jones/Nahuel Huapi Este 和 Confluencia。结论。LH 孢子-花粉组合通过合并新的分类群（例如菊科，具有代表巴塔哥尼亚最古老记录的一种形态类型）增加了这一重要始新世地区的植物化石记录。新数据还强化了先前从大型化石中报道的植物科的存在，例如胡桃科、