Agua de las Avispas, Cerro Cacheuta (MMHN collection): Carnian, Argentina
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Insecta
- Grylloblattodea
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Delopterum acostai n. sp.
Marquat 1991
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1 specimen | |||||||||
| recombined as Triasseuryptilon acostai | ||||||||||
| MMHN 1518 | ||||||||||
| see common names | ||||||||||
Geography
| Country: | Argentina |
| Coordinates: | 33.1° South, 69.1° West (view map) |
| Paleocoordinates: | 49.7° South, 34.8° West |
| Basis of coordinate: | stated in text |
| Geographic resolution: | outcrop |
Time
| Period: | Triassic | Epoch: | Late/Upper Triassic |
| Stage: | Carnian | 10 m.y. bin: | Triassic 3 |
| Key time interval: | Carnian | ||
| Age range of interval: | 237.00000 - 227.00000 m.y. ago |
Stratigraphy
| Geological group: | Uspallata | Formation: | Potrerillos | ||
| Stratigraphy comments: Upper Section of the Potrerillos Formation | |||||
Lithology and environment
| Primary lithology: | white "shale" | ||
| Lithology description: "The Potrerillos Formation is composed of thick, coarse conglomerates at its base and by thinner conglomerates, sandstones, bentonites, mudstones, and carbonaceous shales in the middle and upper part of the unit. It represents a mix of braided-river channels, floodplain deposits, and high-sinuosity meandering channels." Martins-Neto et al., 2007 Insects come from the upper part of the formation | |||
| Environment: | fluvial indet. | Tectonic setting: | rift |
| Geology comments: The Cuyo Basin may be characterised as a passive rift basin produced as a result of generalised extension induced by crustal thinning and collapse of the Upper Palaeozoic (Gondwana) orogen (Llambías and Sato, 1990, 1995; Spalletti, 1999). It can be defined as a half graben that shows strong asymmetric structural and depositional features, as well as intrabasinal highs or transference zones that delimit different depocentres (Kokogián et al., 1988, 1993; Ramos and Kay, 1991; López Gamundí, 1994; Spalletti, 1999, 2001). | |||
Taphonomy
| Modes of preservation: | mold/impression |
| Size of fossils: | macrofossils,mesofossils |
Collection methods and comments
| Reason for describing collection: | taxonomic analysis |
| Collection method comments: Repository: Museo Municipal de Historia Natural de San Rafael, Mendoza, Argentina (MMHN) | |
Metadata
| Database number: | 123021 | ||
| Authorizer: | M. Clapham | Enterer: | J. Karr |
| Modifier: | M. Clapham | Research group: | paleoentomology |
| Created: | 2012-01-10 10:09:16 | Last modified: | 2017-05-23 16:34:15 |
| Access level: | the public | Released: | 2012-01-10 10:09:16 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 53765. | F. J. Marquat. 1991. Ninfa de miomoptero (Insecta) del Triasico de Mendoza, Republica Argentina. Revista del Museo de Historia Natural de San Rafael-Mendoza 11:3-13 [M. Clapham/M. Clapham] |
Secondary references:
| 39201 | R. G. Martins-Neto, O. F. Gallego, and R. N. Melchor. 2003. The Triassic insect fauna from South America (Argentina, Brazil and Chile): a checklist (except Blattoptera and Coleoptera) and descriptions of new taxa. Acta Zoologica Cracoviensia 46(Suppl):229-256 [M. Clapham/J. Karr/M. Clapham] |