This contribution aims to describe the first palaeobotanical record of the Late Pleistocene in the Salto Ander Egg Formation (SAEF) through the analysis of phytolith assemblages. The microremains association allowed us to characterise the palaeoenvironmental conditions for these deposits and to complete the palaeobotanical record for the stratigraphic sequence of the Late Pleistocene in southwestern Entre Ríos province, Argentina. The Salto Ander Egg Formation is composed of fluvial deposits with a well-defined floodplain and channel facies dated at ages ranging from 120 to 60 ky. The phytolith content of the unit was analysed along two stratigraphic sections in outcrops exposed on the cliffs of the fluvial valleys located in the drainage basin of La Ensenada creek. The vegetation composition was interpreted principally from the proportions of very frequent and frequent morphotypes in the phytolith assemblages and was grouped in plant functional group affinities: “non-GSSCPs” (diagnostic grass phytoliths); “GSSCPs” (grass silica short cell phytoliths); “Woody dicots” and “Palms”. The phytolith assemblages describe a palaeoflora composed of a continuous herbaceous stratum of C₃/C₄ grasses, although C₃ might have been more significant accompanied by isolated trees and palms in an open savanna physiognomy, probably with a temperate/warm climate with low rainfall and average to high temperatures.

这项贡献旨在通过分析植硅体组合来描述 Salto Ander Egg 组 (SAEF) 中晚更新世的第一个古植物学记录。微遗迹协会使我们能够描述这些矿床的古环境条件，并完成阿根廷恩特雷里奥斯省西南部晚更新世地层序列的古植物学记录。Salto Ander Egg 组由河流沉积物组成，具有明确的洪泛平原和河道相年代从 120 到 60 ky 不等。该单元的植硅体含量是在位于 La Ensenada 小溪流域的河流山谷悬崖上暴露的露头的两个地层剖面上分析的。植被组成主要从植硅体组合中非常频繁和频繁的形态类型的比例来解释，并按植物功能组亲和力分组：“非 GSSCPs”（诊断草植硅体）；“GSSCPs”（草二氧化硅短细胞植硅体）；“木质双子叶植物”和“棕榈树”。_{植硅体组合描述了由 C 3}/C₄草的连续草本层组成的古植物群，尽管 C₃在开阔的稀树草原地貌中，可能伴随着孤立的树木和棕榈树，可能更显着，可能是温带/温暖的气候，降雨量少，平均到高温。