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

IF 1.7 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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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.