CTA-61: Late Oligocene, Peru

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Chondrichthyes - Myliobatiformes - Potamotrygonidae
Potamotrygon sp. Garman 1877
9 elements
teeth
unclassified
"pacu-like; numerous teeth"
Amphibia - Temnospondyli
postcrania
postcrania
Reptilia - Serpentes
Serpentes indet. Linnaeus 1758
1 element
vertebra
Reptilia - Testudines - Podocnemididae
Podocnemis sp. Wagler 1830
"plate fragments"
Reptilia
2 elements
"radius, diaphysis fragment"
"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 - Sebecidae
"numerous tooth fragments"
Mammalia
Mammalia - Cingulata - Pampatheriidae
Pampatheriidae indet. Paula Couto 1954
1 element
"cephalic scute?"
Mammalia - Mylodontidae
Mylodontidae indet. Ameghino 1889
1 fragment
"fragmentary molariform, large size"
Mammalia
1 fragment
"fragmentary molariform"
Mammalia - Astrapotheria - Astrapotheriidae
1 fragment
"fragmentary lower tooth"
Mammalia - Notoungulata - Toxodontidae
1 fragment
"molar fragment"
Mammalia - Notoungulata
Typotheria indet. Zittel 1892
1 fragment
"Hegetotheriidae/Archaeohyracidae indet. (fragmentary upper cheek tooth)"
Mammalia - Notoungulata - Interatheriidae
1 element
"left M1/2"
Mammalia - Primates - Homunculidae
Marivaux et al. 2016
MUSM-2499 - holotype; hypodigm: MUSM-2500
Mammalia - Rodentia
Caviomorpha indet. Wood and Patterson 1955
2 elements
MUSM 2896-2901
1 element
DP4
    = Octodontoidea indet. Waterhouse 1839
Boivin et al. 2017
MUSM 2892
1 element
M2
Boivin et al. 2017
MUSM 2574 and 2890
Mammalia - Rodentia - Echimyidae
1 element
MUSM 2891
Mammalia - Rodentia
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
1 element
MUSM 2894
1 element
M2
    = Plesiosteiromys newelli n. gen., n. sp. Boivin et al. 2017
Boivin et al. 2017
MUSM 2893 - holotype
2 elements
upper molars
1 fragment
"fragmentary upper molar"
Boivin et al. 2017
MUSM 2888 - type; hypodigm: MUSM 2887, 2889 and 2895
Mammalia - Panameriungulata
Litopterna indet. Ameghino 1889
1 element
p2
Mammalia - Microbiotheria - Microbiotheriidae
Microbiotheriidae indet. (Ameghino 1887)
1 fragment
"upper molar fragment"
Mammalia - Paucituberculata - Abderitidae
cf. Abderites indet. Ameghino 1887
2 elements
"plagiaulacoid P3s"
Mammalia - Paucituberculata - Caenolestidae
? Caenolestidae indet. Trouessart 1898
1 element
"fragmentary m1"
Actinopteri - Characiformes
1 element
11 elements
2 elements
Actinopteri - Characiformes - Anostomidae
"large-sized (numerous teeth)"
Actinopteri - Characiformes - Cynodontidae
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:6.8° South, 67.5° West (Wright 2013)
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: 27.3 - 23.04 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:2025-02-22 15:12:02
Access level:the public Released:2016-01-29 23:41:26
Creative Commons license:CC0
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]