ArticleProceedings of the National Academy of Sciences of the United States of America2021
An Early Oligocene age for the oldest known monkeys and rodents of South America.
Article in Proceedings of the National Academy of Sciences of the United States of America, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 7 papers.
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7 citing papers in PubMed.
- The fate of South America's endemic mammalian fauna in response to the most dramatic Cenozoic climate disruption.Proceedings of the National Academy of Sciences of the United States of America · 2025Article
- The Earliest Known Radiation of Pitheciine Primates.American journal of primatology · 2025Review
- An eosimiid primate of South Asian affinities in the Paleogene of Western Amazonia and the origin of New World monkeys.Proceedings of the National Academy of Sciences of the United States of America · 2023Article
- Caviomorph rodents from the Pampean region (Argentina) in the historical Santiago Roth Collection in Switzerland.Swiss journal of palaeontology · 2023Article
- Article
- An Early Oligocene age for the oldest known monkeys and rodents of South America.Proceedings of the National Academy of Sciences of the United States of America · 2021Article
- New phiocricetomyine rodents (Hystricognathi) from the Jebel Qatrani Formation, Fayum Depression, Egypt.PeerJ · 2021Article
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5 authors.
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Abstract
The Santa Rosa fossil locality in eastern Perú produced the first Paleogene vertebrate fauna from the Amazon Basin, including the oldest known monkeys from South America. This diverse paleofauna was originally assigned an Eocene age based largely on the stage of evolution of the site's caviomorph rodents and marsupials. Here, we present detrital zircon dates that indicate that the maximum composite age of Santa Rosa is 29.6 ± 0.08 Ma (Lower Oligocene), although several zircons from Santa Rosa date to the Upper Oligocene. The first appearance datum for Caviomorpha in South America is purported to be the CTA-27 site in the Contamana region of Perú, which is hypothesized to be ∼41 Ma (Middle Eocene) in age. However, the presence of the same caviomorph species and/or genera at both CTA-27 and at Santa Rosa is now difficult to reconcile with a >11-My age difference. To further test the Middle Eocene age estimate for CTA-27, we ran multiple Bayesian tip-dating analyses of Caviomorpha, treating the ages of all Paleogene species from Perú as unknown. These analyses produced mean age estimates for Santa Rosa that closely approximate the maximum 29.6 ± 0.08 Ma composite date provided by detrital zircons, but predict that CTA-27 is much younger than currently thought (∼30 Ma). We conclude that the ∼41 Ma age proposed for CTA-27 is incorrect, and that there are currently no compelling Eocene records of either rodents or primates in the known fossil record of South America.
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