Turtle Tuff: Middle Eocene, Argentina
collected by P. Puerta, and other teams from MEF 2001, 2010, 2012
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
|
Reptilia
- Testudines
- Chelidae
|
|||||||
|
Hydromedusa casamayorensis
de la Fuente and Bona 2002
|
|||||||
| see common names | |||||||
Geography
| Country: | Argentina | State/province: | Chubut |
| Coordinates: | 45.4° South, 67.6° West (view map) | ||
| Paleocoordinates: | 47.8° South, 57.8° West | ||
| Basis of coordinate: | estimated from map | ||
| Geographic resolution: | small collection |
Time
| Period: | Paleogene | Epoch: | Eocene |
| 10 m.y. bin: | Cenozoic 2-3 | ||
| Key time interval: | Middle Eocene | Mammal zone: | Casamayoran |
| Age range of interval: | 47.80000 - 37.71000 m.y. ago |
Stratigraphy
| Formation: | Sarmiento |
| Stratigraphic resolution: | bed |
Lithology and environment
| Primary lithology: | massive sandy tuff |
| Includes fossils? | Y |
| Lithology description: It is composed of massive and laminated, fine to very fine tuffs and massive mudstones. The geometry of the beds is exclusively tabular, and tractive structures are absent. The only sedimentary structure recognized consists of parallel lamination, strictly associated with fine to very fine tuffaceous beds. Pedogenic features such as iron and manganese nodules, rhizoliths and burrows are common within the massive beds. The fossiliferous bed located in the middle section is constituted by a massive sandy tuff, 1.3 m thick, with rhizoliths at the top. | |
| Environment: | wet floodplain |
| Geology comments: Sedimentary facies recorded in the Turtle Tuff suggest low energy conditions of deposition, and frequent periods of subaerial exposure. These facies are interpreted as having developed in the floodplain setting of a mixed load fluvial channel (e.g. meandering fluvial system), as in the Cerro Verde – Rocas Gemelas composite section (Pol et al. 2012; Sterli et al. 2015). | |
Taphonomy
| Modes of preservation: | body |
| Size of fossils: | macrofossils |
Collection methods and comments
| Collection methods: | field collection | ||
| Reason for describing collection: | taxonomic analysis | ||
| Museum repositories: | MEF | ||
| Collectors: | P. Puerta, and other teams from MEF | Collection dates: | 2001, 2010, 2012 |
Metadata
| Also known as: | Western margin of Cañadon Hondo; near the 'Bird Clay' | ||
| Database number: | 193010 | ||
| Authorizer: | E. Vlachos | Enterer: | E. Vlachos | Research group: | vertebrate |
| Created: | 2018-05-03 08:16:05 | Last modified: | 2018-05-03 08:16:05 |
| Access level: | the public | Released: | 2018-05-03 08:16:05 |
| Creative Commons license: | CC BY | ||
Reference information
Primary reference:
| 65631. | I. J. Maniel, M. S. de la Fuente, J. Sterli, J. M. Jannello, and J. M. Krause. 2018. New remains of the aquatic turtle Hydromedusa casamayorensis (Pleurodira, Chelidae) from the middle Eocene of Patagonia: taxonomic validation and phylogenetic relationships. Papers in Palaeontology 1-29 [E. Vlachos/E. Vlachos/P. Mannion] |