Cerdas (Miocene of Bolivia)

Also known as Cerdas beds

Where: Bolivia (20.9° S, 66.3° W: paleocoordinates 21.3° S, 62.6° W)

• coordinate stated in text

When: Colloncuran (15.5 - 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.

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

Creative Commons license: CC BY (attribution)

Taxonomic list

Mammalia
 Notoungulata - Toxodontidae
Palyeidodon obtusum Roth 1898 notoungulate
 Notoungulata - Hegetotheriidae
Hegetotherium cerdasensis n. sp. Croft et al. 2016 notoungulate
Hegetotherium? sp. nov.
 Notoungulata - Mesotheriidae
Microtypotherium cf. choquecotense Villarroel 1974 notoungulate
 Rodentia - Chinchillidae
Lagostominae indet. Wiegmann 1832 chinchilid
Genus and species indeterminate
 Astrapotheria - Astrapotheriidae
Uruguaytheriinae sp. Kraglievich 1928 placental
Gen.? et sp. nov. "UATF-V-001981, many craniodental fragments."
 Xenarthra - Dasypodidae
Euphractini sp. Winge 1923 armadillo
 Xenarthra - Peltephilidae
Peltephilidae indet. edentate
Genus indeterminate, novel species
 Xenarthra - Nothrotheriidae
Xyophorus bondesioi Scillato-Yané 1979 edentate
 Xenarthra - Megatheriidae
Megatheriinae indet. Gill 1872 edentate
"UATF-V-001989, partial right dentary preserving the last molariform (m4) and the coronoid process."
 Litopterna - Macraucheniidae
Macraucheniidae indet. Ameghino 1889 eutherian
 Sparassodonta -
Borhyaenoidea sp. 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."