Arroyo Los Paisanos: Cenomanian, Argentina
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Reptilia
- Testudines
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Testudines informal gen. et sp. nov.
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1 specimen | |||||||||
| MSV103, posterior part of the carapace (costals 3 to 8 from both sides, three right peripherals and one left peripheral) | ||||||||||
| see common names | ||||||||||
Geography
| Country: | Argentina | State/province: | Santa Cruz |
| Coordinates: | 49.6° South, 71.5° West (view map) | ||
| Paleocoordinates: | 56.6° South, 48.8° West | ||
| Basis of coordinate: | estimated from map |
Time
| Period: | Cretaceous | Epoch: | Late/Upper Cretaceous |
| Stage: | Cenomanian | 10 m.y. bin: | Cretaceous 5 |
| Key time interval: | Cenomanian | ||
| Age range of interval: | 100.50000 - 93.90000 m.y. ago | ||
| Age estimate: | 100.05 ± 0.06 Ma (U/Pb) |
Stratigraphy
| Formation: | Piedra Clavada | ||||
| Local section: | Arroyo Los Paisanos | Local bed: | 49 m | ||
| Local order: | bottom to top | ||||
| Stratigraphy comments: Recently, Poiré et al. (2017) dated U-Pb zircons from two volcanic ash beds of the upper interval of the Piedra Clavada Formation, obtaining ages of 101.6 ± 0.9 Ma and 99 ± 2.8 Ma, confirming a latest Albian–earliest Cenomanian ages for the top of the unit. Those zircons were recently investigated using thermal ionization mass spectrometry (TIMS), and they provided an age of 100.16 ± 0.06 Ma (PG-2) and 100.05 ± 0.04 Ma (Arg-14-13) (Poiré, unpublished), confirming an early Cenomanian age for the uppermost interval of this unit. | |||||
Lithology and environment
| Primary lithology: | not reported |
| Lithology description: small/medium sized coquina bed outcropping as a hardground lens-shaped bank at the top of the section, representing shorelines facies at the upper interval of the Piedra Clavada Formation | |
| Environment: | shoreface |
Taphonomy
| Modes of preservation: | body |
| Size of fossils: | macrofossils |
Collection methods and comments
| Reason for describing collection: | taxonomic analysis |
Metadata
| Database number: | 233975 | ||
| Authorizer: | E. Vlachos | Enterer: | E. Vlachos |
| Created: | 2024-03-11 08:16:37 | Last modified: | 2024-03-11 08:16:37 |
| Access level: | the public | Released: | 2024-03-11 08:16:37 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 87789. | J. Sterli, D. Moyano-Paz, A. Varela, D. G. Poiré, and A. Iglesias. 2024. An unusual circumpolar turtle (Testudinata: Testudines) from the Earliest Late Cretaceous of Patagonia, Argentina. Ameghiniana 61(1):34-44 [E. Vlachos/E. Vlachos] |