Assoc. I (200-205 m) [Alfa Mbr, Santa Marta Fm]: Santonian, Antarctica
collected by Olivero
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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unclassified
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Natalites rossensis
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Cephalopoda
- Ammonitida
- Tetragonitidae
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Gaudryceras sp.
de Grossouvre 1894
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Cephalopoda
- Ammonitida
- Baculitidae
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Baculites aff. kirki
Matsumoto 1959
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| see common names | |||||||
Geography
| Country: | Antarctica |
| Coordinates: | 63.8° South, 58.0° West (view map) |
| Paleocoordinates: | 63.9° South, 64.8° West |
| Basis of coordinate: | estimated from map |
| Geographic resolution: | outcrop |
Time
| Period: | Cretaceous | Epoch: | Late/Upper Cretaceous |
| Stage: | Santonian | 10 m.y. bin: | Cretaceous 6 |
| Key time interval: | Santonian | ||
| Age range of interval: | 86.30000 - 83.60000 m.y. ago |
Stratigraphy
| Formation: | Santa Marta | ||||
| Stratigraphic resolution: | bed | ||||
| Stratigraphy comments: STRATIGRAPHIC RELATIONS: From the informal Alfa (Alpha) Mbr of the Santa Marta Fm, which regionally overlies the Hidden Lake Fm (Coniacian), and is overlain by the López de Bertodano Fm (Campanian-Maastrichtian). AGE: Santonian, on the basis of ammonite biostratigraphy. STRATIGRAPHIC POSITION: From near the base of the regional section, between 200-205 m. | |||||
Lithology and environment
| Primary lithology: | lithified silty sandstone |
| Includes fossils? | Y |
| Includes fossils? | Y |
| Lithology description: SPECIFIC LITHOLOGY: Sandy siltstone according to Fig. 2 of Olivero (1992). LITHIFICATION: Lithified, on the basis of figured specimens. | |
| Environment: | offshore |
| Geology comments: ENVIRONMENT: Shallow siliciclastic marine setting. | |
Taphonomy
| Modes of preservation: | cast,mold/impression |
| Size of fossils: | macrofossils |
Collection methods and comments
| Collection excludes: | some macrofossils |
| Collection methods: | surface (in situ),field collection |
| Reason for describing collection: | biostratigraphic analysis |
| Collectors: | Olivero |
| Collection method comments: COLLECTOR: E. B. Olivero. REPOSITORY: Centro de Investigaciones en Recurso Geologicos (CIRGEO). | |
| Taxonomic list comments:COVERAGE: Exhaustive for ammonoidea. Other taxa may be present, but were not listed in present biostratigraphic treatment. NOMENCLATURE: Not an authoritative publication, but with fairly modern nomenclature and species-resolution identifications where listed. | |
Metadata
| Database number: | 83374 | ||
| Authorizer: | A. Hendy | Enterer: | A. Hendy | Research group: | marine invertebrate |
| Created: | 2008-08-19 12:55:26 | Last modified: | 2013-11-25 13:37:23 |
| Access level: | the public | Released: | 2008-08-19 12:55:26 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 27994. | E. B. Olivero. 1992. Asociaciones de amonites de la formacion Santa Marta (Cretacio Tardio), Isla James Ross, Antartida. Geologia de la Isla James Ross 47-75 [A. Hendy/A. Hendy] |