期刊
JOURNAL OF MAMMALIAN EVOLUTION
卷 28, 期 3, 页码 621-633出版社
SPRINGER
DOI: 10.1007/s10914-021-09545-w
关键词
Mammals; Cingulates; Lower section of the Lumbrera formation; Northwestern Argentina; Paleogene; Eocene
资金
- Agencia Nacional de Promocion Cientifica y Tecnologica (ANPYCT) [PICT 201-0508]
- Romanian Executive Agency for Higher Education, Research, Development and Innovation Funding project [PN-III-P4-ID-PCCF-2016-0014]
- CONICET-MACN grant [PUE22920160100098]
Recent research has identified the basal beds of the lower section of the Lumbrera Formation as early Eocene deposits dating between 55-46.2 Ma, based on a succession of hyperthermal events. The study also presents one of the oldest cingulate assemblages in America from the early Eocene hyperthermal period, indicating an early diversification of the Cingulata during the Paleocene.
Recently, the basal beds of the lower section of the Lumbrera Formation have been referred to the early Eocene (Ypresian) based on the identification of a succession of hyperthermal events globally dated between 52 and 55 Ma. Nevertheless, this section have also been referred to the middle Eocene (Lutetian) based on the 'evolutionary stage' of its fossil mammals. In this contribution, we present a new U-238-Pb-206 isochron age (46.2 Ma) obtained from samples taken on various independent points across paleosol and matrix positioned at the top of the lower section of the Lumbrera Formation. The new age is consistent with the hyperthermal scheme and constrains the deposition of the lower section of the Lumbrera Fm. between 55-46.2 Ma. In this new geochronological framework, we present one of the most ancient cingulate assemblages from America, recorded during the early Eocene hyperthermal. The specimens involved were recovered from the lowest levels of the lower section of the Lumbrera Formation at Los Cardones National Park, Calchaqui Valleys, Salta Province, Argentina. This cingulate assemblage is formed by the armadillos Pucatherium parvum, a species widely distributed in the Eocene of northwestern Argentina and a new taxon, Noatherium emilioi, gen. et sp. nov. In this new geochronological framework, the taxonomic composition and morphological variations observed in the two species described here and their probably contemporaneous Riostegotherium yanei from the Itaborai basin (Brazil) support an early diversification of the Cingulata during the Paleocene, and reinforce an intertropical origin for the group.
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