CTA-61: Late Oligocene, Peru

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
unclassified
Serrasalminae indet.
"pacu-like; numerous teeth"
Chondrichthyes - Myliobatiformes - Potamotrygonidae
Potamotrygon sp. Garman 1877
9 elements
teeth
Mammalia
Marsupialia indet. (Illiger 1811)
Mammalia - Panameriungulata
Litopterna indet. Ameghino 1889
1 element
p2
Mammalia - Primates - Homunculidae
Soriacebinae indet. Kay 2010
    = Canaanimico amazonensis n. gen., n. sp. Marivaux et al. 2016
Marivaux et al. 2016
MUSM-2499 - holotype; hypodigm: MUSM-2500
Mammalia - Rodentia
Caviomorpha indet. Wood and Patterson 1955
2 elements
MUSM 2896-2901
? Eoespina sp. Frailey and Campbell 2004
1 element
DP4
    = Octodontoidea indet. Waterhouse 1839
Boivin et al. 2017
MUSM 2892
Mammalia - Rodentia - Echimyidae
Adelphomyinae indet. Patterson and Pascual 1968
1 element
MUSM 2891
Mammalia - Rodentia
Deseadomys sp. Wood and Patterson 1959
1 element
M2
    = Deseadomys cf. arambourgi Wood and Patterson 1959
Boivin et al. 2017
MUSM 2574 and 2890
cf. Eoincamys sp. Frailey and Campbell 2004
17 elements
teeth
    = Chambiramys sylvaticus n. gen., n. sp. Boivin et al. 2017
Boivin et al. 2017
MUSM 2885 - holotype; hypodigm: MUSM 2573, 2874–2886
? Erethizontoidea indet. Bonaparte 1845
1 element
MUSM 2894
Erethizontidae informal n. sp. 2
1 element
M2
    = Plesiosteiromys newelli n. gen., n. sp. Boivin et al. 2017
Boivin et al. 2017
MUSM 2893 - holotype
? Chinchilloidea informal n. sp. 1
2 elements
upper molars
Chinchilloidea indet. Bennett 1833
1 fragment
"fragmentary upper molar"
    = Scleromys praecursor n. sp. Boivin et al. 2017
Boivin et al. 2017
MUSM 2888 - type; hypodigm: MUSM 2887, 2889 and 2895
Mammalia
Mylodontoidea indet. Gill 1872
1 fragment
"fragmentary molariform"
Mammalia - Mylodontidae
Mylodontidae indet. Ameghino 1889
1 fragment
"fragmentary molariform, large size"
Mammalia - Cingulata - Pampatheriidae
Pampatheriidae indet. Paula Couto 1954
1 element
"cephalic scute?"
Mammalia - Astrapotheria - Astrapotheriidae
Astrapotheriidae indet. Ameghino 1887
1 fragment
"fragmentary lower tooth"
Mammalia - Notoungulata - Toxodontidae
Toxodontidae indet. Scott 1873
1 fragment
"molar fragment"
Mammalia - Notoungulata
Typotheria indet. Zittel 1892
1 fragment
"Hegetotheriidae/Archaeohyracidae indet. (fragmentary upper cheek tooth)"
Mammalia - Notoungulata - Interatheriidae
Interatheriinae indet. Simpson 1945
1 element
"left M1/2"
Mammalia - Paucituberculata - Abderitidae
cf. Abderites indet. Ameghino 1887
2 elements
"plagiaulacoid P3s"
Mammalia - Paucituberculata - Caenolestidae
? Caenolestidae indet. Trouessart 1898
1 element
"fragmentary m1"
Mammalia - Microbiotheria - Microbiotheriidae
Microbiotheriidae indet. (Ameghino 1887)
1 fragment
"upper molar fragment"
Reptilia - Sebecidae
cf. Sebecus sp. Stirton 1953
"numerous tooth fragments"
Reptilia
Caimaninae indet. Brochu 1999
"teeth & fragments"
cf. Purussaurus sp. Barbosa Rodrigues 1892
3 elements
"one worn tooth, another fresh one; osteoderm"
Gavialoidea indet. Brochu 1997
"several teeth & fragments"
Reptilia - Theropoda
Aves indet. Linnaeus 1758
2 elements
"radius, diaphysis fragment"
Reptilia - Serpentes
Serpentes indet. Linnaeus 1758
1 element
vertebra
Reptilia - Testudines - Podocnemididae
Podocnemis sp. Wagler 1830
"plate fragments"
Amphibia - Temnospondyli
Anura informal indet., non-Pipidae
postcrania
Anura indet. (Fischer von Waldheim 1813)
postcrania
Actinopteri - Characiformes
Characiformes informal dome-like tooth
1 element
Characiformes informal pad-like teeth
11 elements
Characiformes informal tricuspid teeth
2 elements
Actinopteri - Characiformes - Anostomidae
Leporinus sp. Lundberg 1997
"large-sized (numerous teeth)"
Actinopteri - Characiformes - Cynodontidae
cf. Hydrolycus sp. Lundberg 1997
20 elements
Actinopteri - Siluriformes - Pimelodidae
cf. Phractocephalus sp. Spix and Agassiz 1829
1 element
"pectoral spine"
see common names

Geography
Country:Peru State/province:Loreto
Coordinates: 7.4° South, 75.0° West (view map)
Paleocoordinates:8.9° South, 69.4° West
Basis of coordinate:stated in text
Geographic resolution:small collection
Time
Period: Paleogene Epoch: Oligocene
Stage: Chattian 10 m.y. bin: Cenozoic 4
Key time interval: Late Oligocene
Age range of interval: 27.82 - 23.03 m.y. ago
Age estimate: maximum 26.56 ± 0.07 Ma (U/Pb)
Stratigraphy
Formation:Chambira Member:base
Stratigraphic resolution:bed
Stratigraphy comments: 15 m above the base of the Chambira Formation; 4 m above a tuffaceous bed (CTA-08SA), dated at 26.56 +- 0.07 Ma (Late Oligocene; Deseadan SALMA) by radiometric U–Pb analyses performed on detrital zircon grains
Lithology and environment
Primary lithology:pebbly,intraclastic sandy conglomerate
Includes fossils?Y
Lithology description: channelized conglomerate characterized by sharp quartz pebbles and multicoloured volcanic/metamorphic clasts included in a sandy matrix
Environment:"channel"
Taphonomy
Modes of preservation:body
Size of fossils:mesofossils
Collection methods and comments
Reason for describing collection:general faunal/floral analysis
Metadata
Also known as:Contamana; CTA 61
Database number:176147
Authorizer:J. Zijlstra, P. Mannion Enterer:J. Zijlstra, P. Mannion
Modifier:K. Pino Research group:vertebrate
Created:2016-01-29 23:41:26 Last modified:2023-07-21 08:26:07
Access level:the public Released:2016-01-29 23:41:26
Creative Commons license:CC BY
Reference information

Primary reference:
57830. P. Antoine, M. A. Abello, S. Adnet, A. J. A. Sierra, P. Baby, G. Billet, M. Boivin, Y. Calderón, A. Candela, J. Chabain, and F. Corfu. 2016. A 60-million-year Cenozoic history of western Amazonian ecosystems in Contamana, eastern Peru. Gondwana Research 31:30-59 [J. Zijlstra/J. Zijlstra/P. Wagner]

Secondary references:

62623 M. Boivin, L. Marivaux, A. M. Candela, M. J. Orliac, F. Pujos, R. Salas-Gismondi, J. V. Tejada-Lara and P.-O. Antoine. 2017. Late Oligocene caviomorph rodents from Contamana, Peruvian Amazonia. Papers in Palaeontology 3(1):69-109 [P. Mannion/P. Mannion]
85343 K. E. Campbell, P. B. O'Sullivan, J. G. Fleagle, D. Vries, and E. R. Seiffert. 2021. An Early Oligocene age for the oldest known monkeys and rodents of South America. Proceedings of the National Academy of Sciences 118(37):1-8 [J. Carrillo/K. Pino]
59886 L. Marivaux, S. Adnet, A. J. Altamirano-Sierra, M. Boivin, F. Pujos, A. Ramdarshan, R. Salas-Gismondi, J. V. Tejada-Lara, and P.-O. Antoine. 2016. Neotropics provide insights into the emergence of New World monkeys: New dental evidence from the late Oligocene of Peruvian Amazonia. Journal of Human Evolution 97:159-175 [P. Mannion/P. Mannion]