Also known as CTA 27; Contamana
Where: Loreto, Peru (7.3° S, 74.9° W: paleocoordinates 9.5° S, 68.2° W)
• coordinate stated in text
• small collection-level geographic resolution
When: Gran Barranca Member (Pozo Formation), Priabonian to Priabonian (38.0 - 28.1 Ma)
• Campbell et al. (2021). 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.
• bed-level stratigraphic resolution
Environment/lithology: terrestrial; lithified, muddy claystone
Size classes: mesofossils, microfossils
Preservation: original phosphate
Collection methods: Museum repository: Museum of Natural Hisotory in Lima, Peru
Primary reference: P. O. Antoine, L. Marivaux, D. A. Croft, G. Billet, M. Ganerod, C. Jaramillo, T. Martin, M. Orliac, J. Tejada, A. J. Altamirano, F. Duranthon, G. Fanjat, S. Rousse and R. Salas-Gismondi. 2011. Middle Eocene rodents from Peruvian Amazonia reveal the pattern and timing of caviomorph origins and biogeography. Proceedings of The Royal Society B 279:1319-1326 [C. Jaramillo/A. Cardenas ]more details
Purpose of describing collection: taxonomic analysis
PaleoDB collection 144474: authorized by Carlos Jaramillo, entered by Andrés Cárdenas on 08.05.2013, edited by Jelle Zijlstra, Mark Uhen and Philip Mannion
Creative Commons license: CC BY (attribution)
Taxonomic list
unclassified | |
Scabratriletes | |
Scabratriletes sp. Van der Hammen | |
Striatriletes | |
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Psilatriporites | |
Psilatriporites sp. Van der Hammen | |
Striatricolpites | |
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Lycopodiopsida | |
Retitriletes sp. Pierce 1961 clubmoss | |
Equisetopsida | |
Inaperturopollenites sp. Potonié 1966 | |
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Retistephanocolpites | |
Retistephanocolpites sp. Leidelmeyer 1966 | |
Scabratriporites | |
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Psilastephanoporites | |
Psilastephanoporites sp. Regali et al. 1974 | |
Psilastephanocolpites | |
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Foveotricolpites | |
Foveotricolpites sp. Pierce 1961 | |
Foveomonocolpites | |
Foveomonocolpites sp. Wijmstra 1971 | |
Retibrevitricolporites | |
Retibrevitricolporites sp. Legoux 1978 | |
Psilatricolpites | |
Psilatricolpites sp. Van der Hammen and Wijmstra 1964 | |
Retipollenites | |
Retipollenites sp. González-Guzmán 1967 | |
Retitricolpites | |
Retitricolpites sp. Van der Hammen 1956
Retitricolpites simplex González-Guzmán 1967 | |
Psilamonocolpites | |
Psilamonocolpites sp. Van der Hammen and Garcia de Mutis 1966 | |
Retitrescolpites | |
Retitrescolpites sp. Sah 1967
Retitrescolpites magnus Jaramillo and Dilcher 2001 | |
Monocolpites | |
Monocolpites sp. Van der Hammen 1954 | |
Magnoliopsida | |
Gemmamonocolpites sp., Striatricolporites porolalongatus, Striatricolporites reticulatus, Striatricolporites sp., Striatricolporites digitatus, Foveotricolporites porololongatus, Striatopollis sp., Striatopollis catatumbus, Psilatricolporites pseudomarginatus, Psilatricolporites sp., Retitricolporites colpotransversalis, Retitricolporites porolalongatus, Retitricolporites pseudorhoipites, Retitricolporites sp., Rhoipites prolatus
Gemmamonocolpites sp. Van der Hammen and Garcia 1966
Striatricolporites sp. Leidelmeyer 1966
Striatricolporites digitatus Jaramillo and Dilcher 2001
Striatopollis sp. Krutzsch 1959
Striatopollis catatumbus Gonzalez-Guzman 1967
Psilatricolporites sp. Pierce 1961
Retitricolporites sp. Van der Hammen and Wymstra 1964 | |
Dicotyledoneae | |
Stephanocolpites sp. Van der Hammen 1954 | |
Corsinipollenites psilatus Jaramillo and Dilcher 2001 willowherb | |
Angiospermae | |
Cricotriporites macroporus Jaramillo and Dilcher 2001 dogbane | |
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Perfotricolpites digitatus González-Guzmán 1967 bindweed | |
Proxapertites psilatus Sarmiento 1992 | |
Retimonocolpites sp. Pierce 1961 | |
Margocolporites vanwijhei Germeraad et al. 1968 legume
Polyadopollenites sp. Pflug and Thomson 1953 legume
Spirosyncolpites spiralis González-Guzmán 1967 legume | |
Perisyncolporites pokornyi Germeraad et al. 1968 | |
Echiperiporites sp. Anzotegui and Cuadrado 1996
Echiperiporites cf. estelae Germeraad et al. 1968
Echiperiporites estelae Germeraad et al. 1968 | |
Tetraporopollenites sp. Frantz 1960 | |
Podocarpidites sp. Cookson 1947 podocarp | |
Scabratricolporites | |
Scabratricolpites sp. Van der Hammen 1956 | |
Lycopsida | |
Foveotriletes sp. Van der Hammen and Potonié 1956 | |
Psilatriletes | |
Psilatriletes sp. Potonié 1956 | |
Pteridopsida | |
Echinatisporis sp. Krutzsch 1959
? Polypodiaceoisporites fossulatus Jaramillo and Dilcher 2001 | |
Polypodiopsida | |
Trichotomosulcites sp. Couper 1953
Laevigatosporites sp. Ibrahim 1933 | |
Polypodiisporites sp. Potonié 1931 | |
Echimonoletes | |
Echimonoletes sp. der Hammen | |
Ostracoda | |
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Malacostraca | |
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Bivalvia | |
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Gastropoda | |
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Reptilia | |
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"Chelonia indet." = Testudines2
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Mammalia | |
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"Stegosimpsonia cf. chubutana" = Pseudostegotherium chubutanum2
"Stegosimpsonia cf. chubutana" = Pseudostegotherium chubutanum2 Ameghino 1902 armadillo one perforated scute
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"Phyllostomatidae indet." = Phyllostomidae2
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Canaanimys maquiensis n. gen. n. sp., cf. Eoespina sp., Chachapoyamys cf. kathetos4, Eobranisamys javierpradoi n. sp.3, Cachiyacuy kummeli n. sp., Cachiyacuy contamanensis n. gen. n. sp.
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? Sudamericidae indet.2 Scillato-Yané and Pascual 1984 mammal "probable sudamericid", two fragmentary teeth
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Amphibia | |
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Gnathostomata | |
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Actinopteri | |
Characiformes "croc-like teeth"2, Characiformes "hook-like teeth"2, Characiformes "pad-like teeth"2, Characiformes "acuminate teeth"2
Characiformes "croc-like teeth"2 Regan 1911
Characiformes "hook-like teeth"2 Regan 1911
Characiformes "pad-like teeth"2 Regan 1911
Characiformes "acuminate teeth"2 Regan 1911 | |
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Chondrichthyes | |
Potamotrygon ucayalensis n. sp.1
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unclassified | |
Fungi indet. Jahn and Jahn 1959 | |
Dinophyceae | |
Lingulodinium sp. Wall 1967 | |
Tetracolporopollenites | |
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Psilaperiporites | |
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