Seymour Island, locality 4: Ypresian, Antarctica
collected by Prof. Andrzej Gazdzicki 1988
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
|
Rhynchonellata
- Terebratulida
- Terebratellidae
|
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Terebratella sp.
d'Orbigny 1847
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2 specimens | ||||||
| see common names | |||||||
Geography
| Country: | Antarctica |
| Coordinates: | 64.2° South, 56.7° West (view map) |
| Paleocoordinates: | 63.4° South, 63.8° West |
| Basis of coordinate: | estimated from map |
| Geographic resolution: | outcrop |
Time
| Period: | Paleogene | Epoch: | Eocene |
| Stage: | Ypresian | 10 m.y. bin: | Cenozoic 2 |
| Key time interval: | Ypresian | ||
| Age range of interval: | 56 - 47.8 m.y. ago |
Stratigraphy
| Geological group: | Seymour Island | Formation: | La Meseta | ||
| Stratigraphic resolution: | group of beds | ||||
| Stratigraphy comments: Unit II of the La Meseta Formation (Elliot and Trautman 1982) | |||||
Lithology and environment
| Primary lithology: | massive,lenticular,deformed bedding,bioturbation,pebbly unlithified silty sandstone |
| Secondary lithology: | massive,lenticular,deformed bedding,bioturbation,pebbly unlithified muddy siltstone |
| Includes fossils? | Y |
| Includes fossils? | Y |
| Lithology description: The La Meseta Formation is an upward-coarsening sequence of unconsolidated fine-grained sands, silts, and muds. Unit II, 89 meters thick, is lithologically similar to unit I but also contains both lenticular bodies of unconsolidated massive sand and consolidated sand beds with both pebbles and Cucullea bivalves. Soft sediment slumping and folding are observed within unit II. (Pezzetti and Krissek 1986) | |
| Environment: | delta front |
| Geology comments: The La Meseta Formation is interpreted as a relatively shallow water deposit, based on both fossil content and sedimentary structures. Elliot and Trautman (1982) originally proposed that the La Meseta was deposited as a prograding tidally dominated delta, with unit I representing the prodelta, unit II the deltafront, and unit III the lagoonal (or delta-plain) sequence. Although Woodburne and Zinsmeister (1984) interpreted accumulations of arthropods, mammal teeth, whale and penguin bones, and other fossil remains in unit II as beach deposits,sedimentary structures in unit II do not indicate an active beach-front environment. Our data suggest that a deltaic environment provides one reasonable hypothesis for La Meseta deposition but that a complete deltaic sequence is not present. If the La Meseta Formation does represent a deltaic deposit, only the delta-front is preserved. In addition, lateral changes in lithology have not been completely analyzed, without which distinction between a tidally influenced coastline and a delta cannot be made. | |
Taphonomy
| Modes of preservation: | body |
| Size of fossils: | macrofossils |
Collection methods and comments
| Collection excludes: | some macrofossils | ||
| Collection methods: | survey of museum collection | ||
| Reason for describing collection: | taxonomic analysis | ||
| Collectors: | Prof. Andrzej Gazdzicki | Collection dates: | 1988 |
| Collection method comments: Collected during the Argentine-Polish Field Party of 1988.
Repository: Institue of Paleobiology of the Polish Academy of Sciences (ZPAL Bp.XXXIV) | |||
Metadata
| Database number: | 152834 | ||
| Authorizer: | M. Clapham | Enterer: | M. Manojlovic |
| Modifier: | M. Clapham | Research group: | marine invertebrate |
| Created: | 2013-12-01 15:34:30 | Last modified: | 2019-08-17 20:02:01 |
| Access level: | the public | Released: | 2013-12-01 15:34:30 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 49259. | M. A. Bitner. 1991. A supposedly new brachiopod from the Paleogene of Seymour Island, West Antarctica. Polish Polar Research 12(2):243-246 [M. Clapham/M. Manojlovic] |