Nazareno (area 1) (Miocene of Bolivia)

Also known as 2 km west of Arenales

Where: Potosí, Bolivia (21.7° S, 65.6° W: paleocoordinates 22.1° S, 61.9° W)

• coordinate stated in text

• local area-level geographic resolution

When: Nazareno Formation, Langhian (16.0 - 13.8 Ma)

• Probably Langhian based on Croft and Anaya (2020); Townsend and Croft 2010: 9.58 ± 0.11 Ma to 20.9 ± 0.6 Ma? Colloncuran Oiso 1991; Héail et al. 1996; Horton 1998

•

•middle and upper members of the Nazareno Formation

• group of beds-level stratigraphic resolution

Environment/lithology: fluvial-lacustrine; poorly lithified mudstone and conglomerate

• fossils derive from braided stream deposits (primarily mudstones)
• conglomerates, mudstones, and sandstones (Hérail et al. 1996; Horton 1998).

Size classes: macrofossils, mesofossils

Preservation: permineralized

Reposited in the MNHN (La Paz)

Collection methods: surface (float), surface (in situ), mechanical,

Primary reference: L. G. Marshall and T. Sempere. 1991. The Eocene to Pleistocene vertebrates of Bolivia and their stratigraphic context: a review. In R. Suárez-Soruco (ed.), Fósiles y Facies de Bolivia - Vol. 1 Vertebrados (Revista Ténica de YPFB) 12(3-4):631-652 [D. Croft/D. Weinstein/S. Bruning]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 68402: authorized by Darin Croft, entered by Deborah Weinstein on 19.01.2007, edited by Philip Mannion and Jelle Zijlstra

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
unclassified
  -
Chinchillinae "gen. et sp. nov."1
Aves
 Gruiformes - Phorusrhacidae
? Phorusrhacidae indet.1
? Phorusrhacidae indet.1 Ameghino 1889 terror bird
Reptilia
 Testudines - Testudinidae
? Testudinidae indet.1
? Testudinidae indet.1 Batsch 1788 turtle
Mammalia
 Sparassodonta - Borhyaenidae
? Borhyaenidae indet.1
? Borhyaenidae indet.1 metatherian
2 canine teeth
 Notoungulata - Mesotheriidae
"Plesiotypotherium" minus1
"Plesiotypotherium" minus1 Croft 2007 notoungulate
Lots of specimens
 Notoungulata - Interatheriidae
Interatheriinae indet.1, Juchuysillu arenalesensis n. gen. n. sp.1
Interatheriinae indet.1 Simpson 1945 notoungulate
UATF-V-001077, 001084, 002020
Juchuysillu arenalesensis n. gen. n. sp.1 Croft and Anaya 2020 notoungulate
UATF-V-002075 - holotype
 Notoungulata - Hegetotheriidae
Hegetotherium cerdasensis2
Hegetotherium cerdasensis2 Croft et al. 2016 notoungulate
Dentary
 Notoungulata - Toxodontidae
Toxodontidae indet.1
Toxodontidae indet.1 Ameghino 1889 notoungulate
 Astrapotheria - Astrapotheriidae
? Astrapotheriidae indet.1
? Astrapotheriidae indet.1 Ameghino 1887 placental
 Panameriungulata - Proterotheriidae
cf. Thoatherium sp.1
cf. Thoatherium sp.1 Ameghino 1887 placental
Dentary
 Panameriungulata - Macraucheniidae
Macraucheniidae indet.1
Macraucheniidae indet.1 Ameghino 1889 placental
 Rodentia - Chinchillidae
Prolagostomus sp.3
Prolagostomus sp.3 Ameghino 1887 chinchilid
Dentary
 Rodentia -
Octodontoidea indet.1, Acarechimys sp.1
Octodontoidea indet.1 Waterhouse 1839 caviomorph
Dentary
Acarechimys sp.1 Patterson 1965 caviomorph
 Cingulata - Dasypodidae
Euphractini indet.1, Eutatini indet.1
Euphractini indet.1 Winge 1923 armadillo
Scutes
Eutatini indet.1 armadillo
 Megatherioidea - Nothrotheriidae
cf. Xyophorus sp.1
cf. Xyophorus sp.1 Ameghino 1887 edentate
 Megatherioidea - Megatheriidae
Megatheriinae indet.1
Megatheriinae indet.1 Gill 1872 edentate
1Croft and Anaya 2020; 2Croft et al. 2016; 3Oiso 1991