Perfil de Rebasa (1982), Muestra#106: Late/Upper Aptian - Early/Lower Albian, Argentina
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Pteridopsida
- Marsileales
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Arcellites santacrucensis megaspore
Baldoni 1987
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unclassified
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Paxillitriletes kachaikense megaspore
Baldoni 1987
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| see common names | |||||||
Geography
| Country: | Argentina | State/province: | Santa Cruz |
| Coordinates: | 49.2° South, 72.1° West (view map) | ||
| Paleocoordinates: | 51.4° South, 39.6° West | ||
| Basis of coordinate: | based on nearby landmark | ||
| Geographic resolution: | small collection |
Time
| Period: | Cretaceous | Epoch: | Early/Lower Cretaceous |
| *Period: | Cretaceous - Cretaceous | *Epoch: | Early - Early |
| *International age/stage: | Late/Upper Aptian - Early/Lower Albian | ||
| Key time interval: | Late/Upper Aptian - Early/Lower Albian | ||
| Age range of interval: | 119.50000 - 109.90000 m.y. ago | ||
| * legacy (obsolete) database fields | |||
Stratigraphy
| Formation: | Kachaike | ||||
| Stratigraphy comments: Reported as "una antiguedad Cretacico inferior (Aptiano-Albiano) o mas precisamente Aptiano superior-Albiano inferior (p. 676)" based on pollen and spores and megaspores. |
Lithology and environment
| Primary lithology: | "shale" |
| Lithology description: "fangolita" probably translated loosely as mudstone [fango = mud], but entered as "shale" to be conservative | |
| Geology comments: "Las evidencias litologicas y paleontologicas han manifestado un ambiente continental, la presencia de restos algales como Dictythylakos y Botryococcus acompanadas de megasporas con fuertes engrosamientos ecuatoriales y apendices diversos, la abundancia de granos de polen y esporas y grandes restos to cuticula indicarian posibles cuerpos de agua de poca profundidad con 'dos breves episodios marinos' debido (Gamerro 1982), a la escasa presencia de dinoflagelados en dos de las muestras estudiadas (p. 675)."?Continental environment with occasional shallow bodies of water and two marine incursions. However, she mentions dinoflagellates in two studied samples but does not say which so environment is uncertain. | |
Taphonomy
| Modes of preservation: | original sporopollenin |
| Size of fossils: | microfossils |
Collection methods and comments
| Collection excludes: | some genera,some microfossils,species names |
| Collection methods: | surface (in situ),chemical,sieve,field collection |
| Minimum sieve size: | 0.150 |
| Reason for describing collection: | taxonomic analysis |
| Taxonomic list comments:Information given about other genera, and some species, present in samples, but not for each sample individually. (see Collection# 32199) | |
Metadata
| Database number: | 32203 | ||
| Authorizer: | R. Lupia | Enterer: | R. Lupia |
| Modifier: | R. Lupia | Research group: | paleobotany |
| Created: | 2003-06-10 14:28:04 | Last modified: | 2003-06-10 17:28:11 |
| Access level: | group members | Released: | 2003-06-10 14:28:04 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 8631. | A. M. Baldoni. 1987. Dos nuevas especies de megasporas de la Formacion Kachaike, Cretacico Inferior de Santa Cruz, Argentina. Anais do X Congreso Brasileiro de Paleontologia, Sociedade Brasileira de Paleontologia 2:669-689 [R. Lupia/R. Lupia/R. Lupia] |