Rio Mayer Fm (55-90 m) - Estancia La Federica: Late Aptian, Argentina
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Cephalopoda
- Ammonitida
- Neocomitidae
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Favrella americana
(Favre 1908)
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Cephalopoda
- Belemnitida
- Belemnopseidae
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Belemnopsis patagoniensis
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| see common names | |||||||
Geography
| Country: | Argentina |
| Coordinates: | 49.0° South, 72.0° West (view map) |
| Paleocoordinates: | 45.2° South, 30.4° West (Wright 2013) |
| Geographic resolution: | outcrop |
Time
| Period: | Cretaceous | Epoch: | Early Cretaceous |
| 10 m.y. bin: | Cretaceous 2-3 | ||
| Key time interval: | Late Aptian | ||
| Age range of interval: | 119.5 - 113 m.y. ago |
Stratigraphy
| Formation: | Rio Mayer | ||||
| Local section: | Estancia La Federica | Local bed: | 72 m | ||
| Local order: | bottom to top | ||||
| Stratigraphic resolution: | bed | ||||
| Stratigraphy comments: STRATIGRAPHIC RELATIONS: Lower Rio Mayer Fm, overlying Springhill Fm (unknown age) and underylying Kachaike Fm (Early Albian?). AGE: Aptian on basis of higher occurrences of N. patagonica and P. russoi. STRATIGRAPHIC POSITION: 35 m thick unit (presumably shale) of Rio Mayer Fm, underlying 45 m thick unit (PBDB# 63992) and overlying 35 m thick unit (PBDB# 63989) near base of section. | |||||
Lithology and environment
| Primary lithology: | lithified "shale" |
| Includes fossils? | Y |
| Includes fossils? | Y |
| Lithology description: SPECIFIC LITHOLOGY: Lithology not stated, but presumed to be shale (like other units from same formation and section). LITHIFICATION: Lithified, assumed on the basis of age and figured specimens. | |
| Environment: | marine indet. |
| Geology comments: ENVIRONMENT: No environmental data reported in text. | |
Taphonomy
| Modes of preservation: | body |
| Size of fossils: | macrofossils |
| Preservation of anatomical detail: | medium |
Collection methods and comments
| Collection methods: | field collection |
| Reason for describing collection: | taxonomic analysis |
| Museum repositories: | MLP |
| Collection method comments: COLLECTOR: Unknown collector. Reported previously by Piantnizky (1938), Feruglio (1949), Ramos (1982), Leanza (1970), Aguirre Urreta (1985), Riccardi et al. (1987) and Riccardi and Medina (2002). REPOSITORY: MLP (Museo de la Plata, Argentina). | |
| Taxonomic list comments:IDENTIFIER: F.A. Medina and A.C. Riccardi. NOMENCLATURE: Authoritative publication, using modern nomenclature, with species-level assignments. COMPLETENESS: Limited to Ammonitida. Other groups not mentioned in text. | |
Metadata
| Database number: | 63990 | ||
| Authorizer: | A. Hendy | Enterer: | A. Hendy |
| Modifier: | A. Hendy | Research group: | marine invertebrate |
| Created: | 2006-08-29 03:38:57 | Last modified: | 2025-02-22 15:12:02 |
| Access level: | the public | Released: | 2006-08-29 03:38:57 |
| Creative Commons license: | CC0 |
Reference information
Primary reference:
| 18443. | F. A. Medina and A.C. Riccardi. 2005. Desmoceratidae, Silesitidae and Kossmaticeratidae (Ammonitida) from the Upper Aptian-Albian of Patagonia (Argentina). Revue de Paleobiologie, Geneve 24(1):251-286 [A. Miller/A. Hendy] |