A new terrestrial vertebrate from the Río Nío Formation (Eocene) of northwestern Argentina

IF 1.5 4区地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY Journal of South American Earth Sciences Pub Date : 2025-02-08 DOI:10.1016/j.jsames.2025.105410

Pablo J. Gaudioso , Juan C. Fernicola , Raúl I. Vezzosi , C.D. Corro , Claudia M. Muruaga

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Abstract

Northwestern Argentina exhibits numerous Paleogene fossiliferous localities. However, in Tucuman Province, this period is represented by a few fossiliferous localities of the Rio Loro Formation (early Paleocene-early Eocene?). In this context, the Río Nío Formation (Eocene) is restricted to that province and no fossiliferous locality has been reported since its formal description in 1973. Recent geo-paleontological field trips in a new locality of the Río Nío Formation in Tucumán province, have revealed new fossil remains. Here we present the first fossil records from the Río Nío Formation, based on several disarticulated osteoderms of a cingulate mammal species, exclusive to northwestern Argentina, Pucatherium parvum (Xenarthra, Dasypodidae). This finding provides new morphological and biogeographical information for this taxon, increasing our current knowledge. The sedimentological analysis conducted at the new locality provides valuable paleoenvironmental and stratigraphic information on the Eocene and Miocene successions in this area.

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阿根廷西北部Río Nío组（始新世）一种新的陆生脊椎动物

阿根廷西北部展示了许多古近系化石的地方。然而，在图库曼省，这一时期以里约热内卢Loro组（早古新世-早始新世？）的几个化石点为代表。在这种情况下，Río Nío组（始新世）仅限于该省，自1973年正式描述以来，没有报道过有化石的地方。最近在Tucumán省Río Nío组的一个新地点进行的地质古生物学实地考察发现了新的化石遗骸。在这里，我们提出了来自Río Nío组的第一个化石记录，基于阿根廷西北部独有的一种扣带哺乳动物的几个脱落的骨皮，Pucatherium parvum （Xenarthra, Dasypodidae）。这一发现为该分类群提供了新的形态和生物地理信息，增加了我们现有的知识。在新址进行的沉积学分析为该区始新统和中新统的古环境和地层资料提供了宝贵的资料。

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来源期刊

Journal of South American Earth Sciences 地学-地球科学综合

CiteScore

3.70

自引率

22.20%

发文量

364

审稿时长

6-12 weeks

期刊介绍： Papers must have a regional appeal and should present work of more than local significance. Research papers dealing with the regional geology of South American cratons and mobile belts, within the following research fields: -Economic geology, metallogenesis and hydrocarbon genesis and reservoirs. -Geophysics, geochemistry, volcanology, igneous and metamorphic petrology. -Tectonics, neo- and seismotectonics and geodynamic modeling. -Geomorphology, geological hazards, environmental geology, climate change in America and Antarctica, and soil research. -Stratigraphy, sedimentology, structure and basin evolution. -Paleontology, paleoecology, paleoclimatology and Quaternary geology. New developments in already established regional projects and new initiatives dealing with the geology of the continent will be summarized and presented on a regular basis. Short notes, discussions, book reviews and conference and workshop reports will also be included when relevant.