Análisis Paleoflorístico de la Formación Río Guillermo (Eoceno Tardío-Oligoceno Temprano?), Santa Cruz, Argentina
Análisis Paleoflorístico de la Formación Río Guillermo (Eoceno Tardío-Oligoceno Temprano?), Santa Cruz, Argentina
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Análisis Paleoflorístico de la Formación Río Guillermo（Eoceno Tardío-Oligoceno Temprano？），圣克鲁斯，阿根廷
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发表时间：
2011
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通讯作者：
Carolina Panti
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作者：
Carolina Panti
摘要
阿根廷圣克鲁斯里奥吉列尔莫组(晚始新世-早渐新世？)的古化石分析巴塔哥尼亚最南端的古近纪大型植物群单位的古植物学研究很少。本文从Río Guillermo组(晚始新世-早渐新世？)中发现了一个新的叶化石标本。并对其进行了分析。古植物学分析表明，发现了10个化石种，其中大部分与Nothofagus Blume(Nothofagus Blume)有关，是标本中含量最丰富的“没药”(Myrcia)Bagualensis(Myrtaceae)。标本涉及蔷薇科、腰果科、樟科和壳斗科。Río Guillermo组的古植物群组合以寒温带植物群为主，表明该地区存在亚南极古植物群。Río Guillermo植物群与渐新世Loreto组植物群的巨大相似性，再加上古气候推断，可能表明Río Guillermo组的年龄比以前提出的更早。
Abstract
PALAEOFLORISTIC ANALYSIS OF THE RIO GUILLERMO FORMATION (LATE EOCENE-EARLY OLIGOCENE?), SANTA CRUZ, ARGENTINA. Macrofloristic Paleogene units of southernmost Patagonia have few palaeobotanical studies. In this paper a new fossil leaf collection recovered from the Río Guillermo Formation (late Eocene—early Oligocene?) is analyzed. The palaeobotanical analysis reveals the presence of 10 fossil species, most of them related to Nothofagus Blume (Nothofagaceae), being the specimens of “Myrcia” bagualensis (Myrtaceae) the most abundant in the collection. Specimens referred to the families Rosaceae, Anacardiaceae, Lauraceae and Fagaceae were also recognized. The palaeofloristic assemblage from the Río Guillermo Formation is dominated by cold temperate taxa suggesting the presence of subantarctic paleofloras in this area. The great similarities between the Río Guillermo flora and that of the Oligocene Loreto Formation, coupled with the palaeoclimatic inferences, might indicate a younger age than previously suggested for the Río Guillermo Formation.