1.5 leagues northeast of Cabeza Blanca (Eocene of Argentina)

Also known as Rio Chico 1er. yac. Pyroth.

Where: Chubut, Argentina (44.9° S, 67.2° W: paleocoordinates 47.4° S, 57.2° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Casamayoran zone, Casamayoran (55.8 - 48.0 Ma)

• group of beds-level stratigraphic resolution

Environment/lithology: terrestrial; lithology not reported

Size class: mesofossils

Collected by Carlos Ameghino, Scarritt Expedition in c. 1900, 1931; reposited in the AMNH

Primary reference: L. G. Marshall. 1982. Systematics of the extinct South American marsupial family Polydolopidae. Fieldiana Geology 12:1-109 [R. Butler/R. Butler]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 175738: authorized by Richard Butler, entered by Richard Butler on 08.01.2016, edited by Jelle Zijlstra and Philip Mannion

Creative Commons license: CC BY (attribution)

Taxonomic list

Mammalia
 Panameriungulata - Proterotheriidae
Josepholeidya adunca2 Ameghino 1901 placental
upper molar
 Notoungulata - Archaeopithecidae
Archaeopithecus rogeri3 Ameghino 1897 notoungulate
AMNH FM 28824, 28871, 28872; MLP 79-I-17-10, 12, 20, 22, 36, 37, 41, 48 and 50
 Notoungulata - Notostylopidae
"Entelostylops appressus n. sp." = Notostylops2
"Entelostylops appressus n. sp." = Notostylops2 notoungulate
MACN 10489, P2, P3, M1, M2 (lectotype), m3.
 Notoungulata - Notopithecidae
Notopithecus sp.1 Ameghino 1897 notoungulate
 Didelphimorphia - Didelphidae
Didelphidae indet.2 opossum
AMNH 28410
 Polydolopimorphia - Polydolopidae
Polydolops serra Ameghino 1902 metatherian
AMNH 28408, 28409, 28412