PBDB Collection

Cerdas (Miocene to of Bolivia)

Also known as Cerdas beds

Where: Bolivia (20.9° S, 66.3° W: paleocoordinates 21.4° S, 62.1° W)

• coordinate stated in text

• outcrop-level geographic resolution

When: Burdigalian to Burdigalian (20.4 - 13.8 Ma)

• The stratigraphic section is exposed on both sides of the road between Cerdas and Atocha and is about 250 m thick (Fig. 2), spanning ca. 3800–4050 m elevation.

•There are multiple fossiliferous levels shown in fig. 2.

•This collection had been assigned to the Langhian, but the dates also fall within the Burdigalian.

•

•Townsend and Croft 2010: Friasian?

• group of beds-level stratigraphic resolution

Environment/lithology: terrestrial; silty sandstone and mudstone

• The lower third of the section mainly consists of siliciclastic channel and overbank deposits, including thick paleosols (Garzione et al., 2014), whereas the upper two- thirds is mainly composed of volcaniclastic sediments deposited by debris flows (lahars) (see Croft et al., 2009, for details.

Size classes: macrofossils, mesofossils

Collected in 2012-2014

Primary reference: D. A. Croft, F. Anaya, D. Auerbach, C. Garzione, and B. J. MacFadden. 2009. New Data on Miocene Neotropical Provinciality from Cerdas, Bolivia. Journal of Mammal Evolution 16:175-198 [D. Croft/M. Sameh/M. Sameh]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 91435: authorized by Darin Croft, entered by Melissa Sameh on 26.09.2009, edited by Jelle Zijlstra, Grace Varnham, Miranta Kouvari and Philip Mannion

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names

Mammalia
Cingulata - Peltephilidae	Peltephilidae indet. Peltephilidae indet. edentate Genus uncertain, novel species; UF 225047
Cingulata - Dasypodidae	Euphractini sp.² Euphractini sp.² Winge 1923 armadillo
Megatherioidea - Megatheriidae	Megatheriinae indet.² Megatheriinae indet.² Gill 1872 edentate "UATF-V-001989, partial right dentary preserving the last molariform (m4) and the coronoid process."
Megatherioidea - Nothrotheriidae	"Xyophorus cf. bondesioi" = Mcdonaldocnus bondesioi "Xyophorus cf. bondesioi" = Mcdonaldocnus bondesioi Scillato-Yané 1979 edentate UATF-V-000871, partial right mandible, UATF-V-0008850, manual ungual phalanx, UATF- V-0008825, pedal ungual phalanx
Astrapotheria - Astrapotheriidae	Uruguaytheriinae sp.² Uruguaytheriinae sp.² Kraglievich 1928 placental Gen.? et sp. nov. "UATF-V-001981, many craniodental fragments."
Notoungulata - Mesotheriidae	Mesotheriinae indet.⁴, "Plesiotypotherium" minus⁴ Mesotheriinae indet.⁴ Alston 1876 notoungulate the smaller specimens UF 225707, UATF- V-000840 "Plesiotypotherium" minus⁴ Croft 2007 notoungulate Plesiotypotherium minus and "Plesiotypotherium" minus. But they say that none of P. minus from Cerdas are actually partaining in the genus. So both are "P". minus
Notoungulata - Interatheriidae	Juchuysillu arenalesensis¹, "Protypotherium cf. attenuatum" = Protypotherium praerutilum Juchuysillu arenalesensis¹ Croft and Anaya 2020 notoungulate UATF-V-000861 "Protypotherium cf. attenuatum" = Protypotherium praerutilum Ameghino 1887 notoungulate UATF-V-000860
Notoungulata - Hegetotheriidae	Hegetotherium cerdasensis n. sp.² Hegetotherium cerdasensis n. sp.² Croft et al. 2016 notoungulate Hegetotherium? sp. nov.
Notoungulata - Toxodontidae	Palyeidodon obtusum Palyeidodon obtusum Roth 1898 notoungulate UATF-V-000870
Panameriungulata - Macraucheniidae	Macraucheniidae indet., Llullataruca cf. shockeyi³ Macraucheniidae indet. Ameghino 1889 placental UATF-V-000881 Llullataruca cf. shockeyi³ McGrath et al. 2018 placental MNHN BLV 148, UATF-V-000881, UF 225719
Rodentia - Chinchillidae	Lagostominae indet. Lagostominae indet. Wiegmann 1832 chinchilid UATF-V-000851 and UATF-V-000864
Sparassodonta -	Borhyaenoidea sp.² Borhyaenoidea sp.² Ameghino 1894 metatherian Gen. et sp. nov. "UATF-V-001984, associated cranial and postcranial bones including a partial basicranium; partial ante- rior palate preserving several alveoli; partial mandible in several pieces preserving the symphysis, p1–m4 alveoli on both sides, partial Lp3–m3, complete Lm4, partial Rp3, complete Rm3, par- tial Rm4; several partial vertebrae (articulated); other unpre- pared postcranial fragments."

¹Croft and Anaya 2020; ²Croft et al. 2016; ³McGrath et al. 2018; ⁴Townsend and Croft 2010