CTA-61 (Oligocene of Peru)

Also known as Contamana; CTA 61

Where: Loreto, Peru (7.4° S, 75.0° W: paleocoordinates 8.9° S, 69.4° W)

• coordinate stated in text

• small collection-level geographic resolution

When: base Member (Chambira Formation), Late/Upper Oligocene (28.4 - 23.0 Ma)

• 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

• bed-level stratigraphic resolution

Environment/lithology: "channel"; pebbly, intraclastic, sandy conglomerate

• channelized conglomerate characterized by sharp quartz pebbles and multicoloured volcanic/metamorphic clasts included in a sandy matrix

Size class: mesofossils

Primary reference: 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]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 176147: authorized by Jelle Zijlstra, entered by Jelle Zijlstra on 29.01.2016, edited by Philip Mannion

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
unclassified
  -
Serrasalminae indet.
Serrasalminae indet.
"pacu-like; numerous teeth"
Chondrichthyes
 Myliobatiformes - Potamotrygonidae
Potamotrygon sp.
Potamotrygon sp. Garman 1877 stingray
teeth
Mammalia
 Marsupialia -
Marsupialia indet.
Marsupialia indet. Illiger 1811 marsupial
 Placentalia -
Litopterna indet.
Litopterna indet. placental
p2
 Primates - Homunculidae
Canaanimico amazonensis n. gen. n. sp.2
Canaanimico amazonensis n. gen. n. sp.2 Marivaux et al. 2016 monkey
 Rodentia -
Caviomorpha indet., Octodontoidea indet.1
Caviomorpha indet. caviomorph
MUSM 2896-2901
Octodontoidea indet.1 Waterhouse 1839 caviomorph
DP4
 Rodentia - Echimyidae
Adelphomyinae indet.
Adelphomyinae indet. Patterson and Pascual 1968 spiny rat
MUSM 2891
 Rodentia -
Deseadomys cf. arambourgi1, Chambiramys sylvaticus n. gen. n. sp.1, ? Erethizontoidea indet., Plesiosteiromys newelli n. gen. n. sp.1, ? Chinchilloidea "n. sp. 1", "Scleromys praecursor n. sp." = Maquiamys praecursor1
Deseadomys cf. arambourgi1 Wood and Patterson 1959 caviomorph
M2
Chambiramys sylvaticus n. gen. n. sp.1 Boivin et al. 2017 caviomorph
teeth
? Erethizontoidea indet. Bonaparte 1845 caviomorph
MUSM 2894
Plesiosteiromys newelli n. gen. n. sp.1 Boivin et al. 2017 caviomorph
M2
? Chinchilloidea "n. sp. 1" Bennett 1833 caviomorph
upper molars
"Scleromys praecursor n. sp." = Maquiamys praecursor1 Boivin et al. 2019 caviomorph
"fragmentary upper molar"
 Xenarthra -
Mylodontoidea indet.
Mylodontoidea indet. Gill 1872 edentate
"fragmentary molariform"
  - Mylodontidae
Mylodontidae indet.
Mylodontidae indet. Ameghino 1889 edentate
"fragmentary molariform, large size"
 Cingulata - Pampatheriidae
Pampatheriidae indet.
Pampatheriidae indet. Paula Couto 1954 edentate
"cephalic scute?"
 Astrapotheria - Astrapotheriidae
Astrapotheriidae indet.
Astrapotheriidae indet. Ameghino 1887 placental
"fragmentary lower tooth"
 Notoungulata - Toxodontidae
Toxodontidae indet.
Toxodontidae indet. Scott 1873 notoungulate
"molar fragment"
 Notoungulata -
Typotheria indet.
Typotheria indet. Zittel 1892 notoungulate
"Hegetotheriidae/Archaeohyracidae indet. (fragmentary upper cheek tooth)"
 Notoungulata - Interatheriidae
Interatheriinae indet.
Interatheriinae indet. Simpson 1945 notoungulate
"left M1/2"
 Paucituberculata - Abderitidae
cf. Abderites indet.
cf. Abderites indet. Ameghino 1887 marsupial
"plagiaulacoid P3s"
 Paucituberculata - Caenolestidae
? Caenolestidae indet.
? Caenolestidae indet. Trouessart 1898 marsupial
"fragmentary m1"
 Microbiotheria - Microbiotheriidae
Microbiotheriidae indet.
Microbiotheriidae indet. Ameghino 1887 marsupial
"upper molar fragment"
Reptilia
 Loricata - Sebecidae
cf. Sebecus sp.
cf. Sebecus sp. Stirton 1953 crocodilian
"numerous tooth fragments"
 Crocodylia - Alligatoridae
Caimaninae indet., cf. Purussaurus sp.
Caimaninae indet. Brochu 1999 crocodilian
"teeth & fragments"
cf. Purussaurus sp. Barbosa Rodrigues 1892 crocodilian
"one worn tooth, another fresh one; osteoderm"
 Crocodylia -
Gavialoidea indet.
Gavialoidea indet. Brochu 1997 crocodilian
"several teeth & fragments"
Aves
  -
Aves indet.
Aves indet. Linnaeus 1758 bird
"radius, diaphysis fragment"
Reptilia
 Serpentes -
Serpentes indet.
Serpentes indet. snake
vertebra
 Testudines - Podocnemididae
Podocnemis sp.
Podocnemis sp. Wagler 1830 river turtle
"plate fragments"
Amphibia
 Salientia -
Anura "indet., non-Pipidae", Anura indet.
Anura indet. frog
postcrania
Actinopteri
 Teleostei -
Characiformes "dome-like tooth", Characiformes "pad-like teeth", Characiformes "tricuspid teeth"
 Characiformes - Anostomidae
Leporinus sp.
Leporinus sp. Lundberg 1997
"large-sized (numerous teeth)"
 Characiformes - Cynodontidae
cf. Hydrolycus sp.
cf. Hydrolycus sp. Lundberg 1997
 Siluriformes - Pimelodidae
cf. Phractocephalus sp.
cf. Phractocephalus sp. Spix and Agassiz 1829 cajaro
"pectoral spine"
1Boivin et al. 2017; 2Marivaux et al. 2016