Cachapoal: Early Oligocene, Chile
collected 1996
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
|
Mammalia
- Notoungulata
- Interatheriidae
|
||||||||||
|
Johnbell hatcheri
Hitz et al. 2006
|
Hitz et al. 2006 | |||||||||
| SGOPV 3451 | ||||||||||
|
Mammalia
- Notoungulata
- Archaeohyracidae
|
||||||||||
|
Archaeotypotherium sp.
Roth 1903
|
Engelman et al. 2020 | |||||||||
|
Mammalia
- Sparassodonta
|
||||||||||
|
Eomakhaira molossus n. gen., n. sp.
Engelman et al. 2020
|
Engelman et al. 2020 | |||||||||
| SGOPV 3490 - holotype | ||||||||||
|
Mammalia
- Polydolopidae
|
||||||||||
|
Polydolops mckennai n. sp.
Flynn and Wyss 2004
|
1 specimen | |||||||||
| SGOPV 3476, partial skull | ||||||||||
| see common names | ||||||||||
Geography
| Country: | Chile |
| Coordinates: | 34.4° South, 70.8° West (view map) |
| Paleocoordinates: | 34.3° South, 63.8° West (Wright 2013) |
| Basis of coordinate: | based on political unit |
| Geographic resolution: | outcrop |
Time
| Period: | Paleogene | Epoch: | Oligocene |
| Stage: | Rupelian | 10 m.y. bin: | Cenozoic 4 |
| Key time interval: | Early Oligocene | ||
| Age range of interval: | 33.9 - 27.82 m.y. ago | ||
| Age estimate: | 29.3 ± 0.1 Ma (Ar/Ar) |
Stratigraphy
| Formation: | Abanico | ||||
| Stratigraphic resolution: | bed | ||||
| Stratigraphy comments: 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 Fossils from the Cachapoal locality are likely at least 29.3 ± 0.1 million years old (at least in part), based on an unpublished date for a volcanic tuff that is thought to either correlate with or overlie the fossil-producing horizons at Los Llanos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with or underlie a sequence in the next drainage south (Rı´o Las Len˜as), preliminarily dated at 29.3 6 0.1 Ma (unpublished 40Ar/39Ar, C.C. Swisher III, personal commun.; Charrier et al., 1997).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’’). | |||||
Lithology and environment
| Primary lithology: | not reported |
| Environment: | terrestrial indet. |
Taphonomy
| Modes of preservation: | body |
| Size of fossils: | macrofossils |
Collection methods and comments
| Reason for describing collection: | taxonomic analysis | Collection dates: | 1996 |
Metadata
| Also known as: | West side of Estero Los Llanos | ||
| Database number: | 176207 | ||
| Authorizer: | J. Zijlstra, P. Mannion | Enterer: | J. Zijlstra, P. Mannion |
| Modifier: | M. Kouvari | Research group: | vertebrate |
| Created: | 2016-01-31 23:14:11 | Last modified: | 2025-02-22 15:12:02 |
| Access level: | the public | Released: | 2016-01-31 23:14:11 |
| Creative Commons license: | CC0 | ||
Reference information
Primary reference:
| 57848. | 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] |
Secondary references:
| 73106 | R. K. Engelman, J. J. Flynn, A. R. Wyss and D. A. Croft. 2020. Eomakhaira molossus, A New Saber-Toothed Sparassodont (Metatheria: Thylacosmilinae) from the Early Oligocene (?Tinguirirican) Cachapoal Locality, Andean Main Range, Chile. American Museum Novitates 3957:1-75 [P. Mannion/P. Mannion] | |
| 62629 | R. B. Hitz, J. J. Flynn, and A. R. Wyss. 2006. New Basal Interatheriidae (Typotheria, Notoungulata, Mammalia) from the Paleogene of Central Chile. American Museum Novitates 3520:1-32 [P. Mannion/P. Mannion] |