Base of Cerro Cuadrado: Maastrichtian, Argentina
collected by Santiago Miner and Gerardo Álvarez-Herrera
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
|
Reptilia
- Sphenodontidae
|
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Alamitosphenos mineri n. gen., n. sp.
Agnolín et al. 2023
|
1 specimen | |||||||||
| MPMIK 1759/p/23 (holotype), incomplete left dentary with three preserved hatchling teeth | ||||||||||
|
? Sphenodontinae indet.
Cope 1871
|
1 specimen | |||||||||
| MPMIK 1760/p/23,incomplete right palatine bone having two teeth | ||||||||||
| see common names | ||||||||||
Geography
| Country: | Argentina | State/province: | Río Negro |
| Coordinates: | 42.0° South, 66.3° West (view map) | ||
| Paleocoordinates: | 44.3° South, 54.6° West | ||
| Basis of coordinate: | stated in text |
Time
| Period: | Cretaceous | Epoch: | Late/Upper Cretaceous |
| Stage: | Maastrichtian | 10 m.y. bin: | Cretaceous 8 |
| Key time interval: | Maastrichtian | ||
| Age range of interval: | 72.10000 - 66.00000 m.y. ago |
Stratigraphy
| Formation: | Los Alamitos | Member: | Lower |
Lithology and environment
| Primary lithology: | brown,yellow mudstone |
| Includes fossils? | Y |
| Lithology description: The specimens here described come from non-calcareous pelitic facies from the Lower Member of the Los Alamitos Formation. | |
| Environment: | terrestrial indet. |
Taphonomy
| Modes of preservation: | body |
| Size of fossils: | macrofossils |
| Preservation of anatomical detail: | medium |
| Abundance in sediment: | few |
| Fragmentation: | frequent |
| Bioerosion: | none |
| Encrustation: | none |
Collection methods and comments
| Collection excludes: | all macrofossils |
| Collection methods: | surface (in situ),field collection |
| Reason for describing collection: | taxonomic analysis |
| Collectors: | Santiago Miner and Gerardo Álvarez-Herrera |
| Collection method comments: MPMIK, Museo Provincial “María Inés Kopp”, Valcheta, Río Negro, Argentina. | |
| Taxonomic list comments:The specimens described here were found together with land snails and abundant microvertebrates, including percomorph and lepisosteioid fishes, pipoid and calyptocephalellid anurans, madtsoiid snakes, meiolaniid and chelid chelonians, sauropod, theropod and hadrosaurid teeth, abundant sauropod eggshells, and
mammals. | |
Metadata
| Also known as: | Nueva Poupée Farm (ex Los Alamitos Farm) | ||
| Database number: | 232186 | ||
| Authorizer: | E. Vlachos | Enterer: | F. Aspromonte |
| Modifier: | F. Aspromonte | Research group: | vertebrate |
| Created: | 2023-10-30 08:11:28 | Last modified: | 2023-10-30 08:35:53 |
| Access level: | the public | Released: | 2023-10-30 08:11:28 |
| Creative Commons license: | CC BY | ||
Reference information
Primary reference:
| 86208. | F. L. Agnolín, A. M. Aranciaga Rolando, N. R. Chimento and F. E. Novas. 2023. New small reptile remains from the Late Cretaceous of Patagonia increase morphological diversity of sphenodontids (Lepidosauria). Proceedings of the Geologists' Association 1-9 [E. Vlachos/F. Aspromonte] |