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"
Amphibia
 Salientia -
Anura "indet., non-Pipidae", Anura indet.
Anura indet. frog
postcrania
Mammalia
 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"
 Placentalia -
Litopterna indet.
Litopterna indet. placental
p2
 Rodentia -
Caviomorpha indet., ? Erethizontoidea indet., Plesiosteiromys newelli n. gen. n. sp.1, Chambiramys sylvaticus n. gen. n. sp.1, ? Chinchilloidea "n. sp. 1", "Scleromys praecursor n. sp." = Maquiamys praecursor1, Octodontoidea indet.1, Deseadomys cf. arambourgi1
Caviomorpha indet. caviomorph
MUSM 2896-2901
? Erethizontoidea indet. Bonaparte 1845 caviomorph
MUSM 2894
Plesiosteiromys newelli n. gen. n. sp.1 Boivin et al. 2017 caviomorph
M2
Chambiramys sylvaticus n. gen. n. sp.1 Boivin et al. 2017 caviomorph
teeth
? Chinchilloidea "n. sp. 1" Bennett 1833 caviomorph
upper molars
"Scleromys praecursor n. sp." = Maquiamys praecursor1 Boivin et al. 2019 caviomorph
"fragmentary upper molar"
Octodontoidea indet.1 Waterhouse 1839 caviomorph
DP4
Deseadomys cf. arambourgi1 Wood and Patterson 1959 caviomorph
M2
 Rodentia - Echimyidae
Adelphomyinae indet.
Adelphomyinae indet. Patterson and Pascual 1968 spiny rat
MUSM 2891
 Primates - Homunculidae
Canaanimico amazonensis n. gen. n. sp.2
Canaanimico amazonensis n. gen. n. sp.2 Marivaux et al. 2016 monkey
 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?"
 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"
 Astrapotheria - Astrapotheriidae
Astrapotheriidae indet.
Astrapotheriidae indet. Ameghino 1887 placental
"fragmentary lower tooth"
 Marsupialia -
Marsupialia indet.
Marsupialia indet. Illiger 1811 marsupial
Reptilia
 Loricata - Sebecidae
cf. Sebecus sp.
cf. Sebecus sp. Stirton 1953 crocodilian
"numerous tooth fragments"
 Crocodylia -
Gavialoidea indet.
Gavialoidea indet. Brochu 1997 crocodilian
"several teeth & 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"
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"
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"
Chondrichthyes
 Myliobatiformes - Potamotrygonidae
Potamotrygon sp.
Potamotrygon sp. Garman 1877 stingray
teeth
1Boivin et al. 2017; 2Marivaux et al. 2016