The Early Eocene Climatic Optimum at the Lower Section of the Lumbrera Formation (Ypresian, Salta Province, Northwestern Argentina): Origin and Early Diversification of the Cingulata
| Autor: | Laura Edith Cruz, Michelle Arnal, Mariano Bond, Laura Chornogubsky, Mercedes Fernández, Ana Natalia Zimicz, Mihai N. Ducea, Magalí Cárdenas, Juan Carlos Fernicola |
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| Rok vydání: | 2021 |
| Předmět: |
0106 biological sciences
Isochron 010506 paleontology biology National park Holocene climatic optimum Structural basin biology.organism_classification 010603 evolutionary biology 01 natural sciences Paleosol Paleontology Taxon Cingulata Paleogene Ecology Evolution Behavior and Systematics Geology 0105 earth and related environmental sciences |
| Zdroj: | Journal of Mammalian Evolution. 28:621-633 |
| ISSN: | 1573-7055 1064-7554 |
| DOI: | 10.1007/s10914-021-09545-w |
| Popis: | 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 238U-206Pb 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. |
| Databáze: | OpenAIRE |
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