Cachapoal (Oligocene of Chile)

Also known as West side of Estero Los Llanos

Where: Chile (34.4° S, 70.8° W: paleocoordinates 36.3° S, 63.0° W)

• coordinate based on political unit

• outcrop-level geographic resolution

When: Abanico Formation, Early/Lower Oligocene (33.9 - 28.4 Ma)

• Exact stratigraphic provenance uncertain; probably early Oligocene, ?Tinguirirican SALMA. Fossils from the Cachapoal locality are likely at least 29.3 ± 0.1 million years old (at least in part), based on an unpublished date for a volcanic tuff that is thought to either correlate with or overlie the fossil-producing horizons at Los Llanos

•Abanico (Coya-Machalı´) Formation, Chile. The precise stratigraphic provenance of the holotype is uncertain, as it was recovered from an automobile-sized block on a talus slope below steeply dipping cliff exposures. Part or all of this stratigraphic interval, however, appears to correlate with or underlie a sequence in the next drainage south (Rı´o Las Len˜as), preliminarily dated at 29.3 6 0.1 Ma (unpublished 40Ar/39Ar, C.C. Swisher III, personal commun.; Charrier et al., 1997). In addition, the source strata certainly predate stratigraphically higher levels in the Rı´o Las Lenas drainage that have been dated at 16.1 and 20.09 Ma (Flynn et al., 1995; Charrier et al., 2002). AGE: Indefinite but possibly correlative with, or older than, levels dated elsewhere at ca. 29.3 6 0.1 Ma (see ‘‘Stratigraphic Occurrence’’).

• bed-level stratigraphic resolution

Environment/lithology: terrestrial; lithology not reported

Size class: macrofossils

Collected in 1996

Primary reference: J. J. Flynn and A. R. Wyss. 2004. A polydolopine marsupial skull from the Cachapoal Valley, Andean Main Range, Chile. Bulletin of the American Museum of Natural History 285:80-92 [J. Zijlstra/J. Zijlstra]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 176207: authorized by Jelle Zijlstra, entered by Jelle Zijlstra on 31.01.2016, edited by Philip Mannion

Creative Commons license: CC BY (attribution)

Taxonomic list

Mammalia
 Notoungulata - Archaeohyracidae
Archaeotypotherium sp.1 Roth 1903 notoungulate
 Notoungulata - Interatheriidae
Johnbell hatcheri2 Hitz et al. 2006 notoungulate
SGOPV 3451
 Polydolopimorphia - Polydolopidae
"Polydolops mckennai n. sp." = Kramadolops mckennai
"Polydolops mckennai n. sp." = Kramadolops mckennai Flynn and Wyss 2004 metatherian
SGOPV 3476, partial skull
 Sparassodonta - Proborhyaenidae
Eomakhaira molossus n. gen. n. sp.1
Eomakhaira molossus n. gen. n. sp.1 Engelman et al. 2020 metatherian
SGOPV 3490 - holotype