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DOI | 10.1073/pnas.2105956118 |
An Early Oligocene age for the oldest known monkeys and rodents of South America | |
Kenneth E. Campbell; Paul B. O’Sullivan; John G. Fleagle; Dorien de Vries; Erik R. Seiffert | |
2021-09-14 | |
发表期刊 | Proceedings of the National Academy of Science |
出版年 | 2021 |
英文摘要 | 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. |
领域 | 地球科学 |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/337627 |
专题 | 地球科学 |
推荐引用方式 GB/T 7714 | Kenneth E. Campbell,Paul B. O’Sullivan,John G. Fleagle,et al. An Early Oligocene age for the oldest known monkeys and rodents of South America[J]. Proceedings of the National Academy of Science,2021. |
APA | Kenneth E. Campbell,Paul B. O’Sullivan,John G. Fleagle,Dorien de Vries,&Erik R. Seiffert.(2021).An Early Oligocene age for the oldest known monkeys and rodents of South America.Proceedings of the National Academy of Science. |
MLA | Kenneth E. Campbell,et al."An Early Oligocene age for the oldest known monkeys and rodents of South America".Proceedings of the National Academy of Science (2021). |
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