Gran Bajo de San Julian: Aquitanian, Argentina
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Gastropoda
- Epitoniidae
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Scalaria rugulosa
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Bravard 1858 | ||||||
Gastropoda
- Turritellidae
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Turritella ambulacrum
Sowerby 1846
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Bravard 1858 | ||||||
Gastropoda
- Struthiolariidae
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Struthiolaria ornata
Sowerby 1846
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Bravard 1858 | ||||||
Gastropoda
- Neogastropoda
- Nassariidae
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Fusus noachinus
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Bravard 1858 | ||||||
Gastropoda
- Neogastropoda
- Muricidae
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Fusus patagonicus
Sowerby 1846
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Bravard 1858 | ||||||
recombined as Trophon patagonicus | |||||||
Gastropoda
- Ficidae
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Pyrula ? ventricosa
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Bravard 1858 | ||||||
synonym of Ficus | |||||||
Bivalvia
- Pectinida
- Pectinidae
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Pecten geminatus
Sowerby 1846
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Bravard 1858 | ||||||
recombined as Zygochlamys geminata | |||||||
Pecten paranensis
d'Orbigny 1842
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Bravard 1858 | ||||||
recombined as Aequipecten paranensis | |||||||
Bivalvia
- Ostreida
- Ostreidae
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Ostrea patagonica
d'Orbigny 1842
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Bravard 1858 | ||||||
recombined as Crassostrea patagonica | |||||||
Rhynchonellata
- Terebratulida
- Terebratellidae
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Terebratula patagonica
Sowerby 1846
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Bravard 1858 | ||||||
recombined as Terebratella patagonica | |||||||
Thecostraca
- Balanomorpha
- Balanidae
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Balanus varians
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Bravard 1858 | ||||||
Echinoidea
- Clypeasteroida
- Scutellidae
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Scutella innominata
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Bravard 1858 | ||||||
Mammalia
- Cetacea
- Kentriodontidae
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Portheus patagonicus n. sp.
Ameghino 1901
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Ameghino 1901 | ||||||
= cf. Kentriodon sp.
Kellogg 1927
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Cione and Cozzuol 1990 | ||||||
Mammalia
- Cetacea
- Squalodelphinidae
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Notocetus vanbenedeni
(Moreno 1892)
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Mammalia
- Cetacea
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Prosqualodon australis
Lydekker 1894
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Reptilia
- Spheniscidae
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Isotremornis nordenskjoldi
Ameghino 1905
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Simpson 1946 | ||||||
synonym of Paraptenodytes robustus | |||||||
Metancylornis curtus
(Ameghino 1901)
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Simpson 1946 | ||||||
synonym of Paraptenodytes robustus | |||||||
Arthrodytes grandis
(Ameghino 1901)
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Simpson 1946 | ||||||
synonym of Paraptenodytes robustus | |||||||
Paraptenodytes brodkorbi n. sp.
Simpson 1972
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Simpson 1972 | ||||||
Arthrodytes andrewsi
(Ameghino 1901)
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Simpson 1946 | ||||||
Reptilia
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Pseudospheniscus concavus
Ameghino 1905
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Simpson 1946 | ||||||
synonym of Palaeospheniscus bergi | |||||||
see common names |
Geography
Country: | Argentina |
Coordinates: | 49.5° South, 68.4° West (view map) |
Paleocoordinates: | 50.4° South, 61.2° West |
Basis of coordinate: | estimated from map |
Time
Period: | Neogene | Epoch: | Miocene |
Stage: | Aquitanian | 10 m.y. bin: | Cenozoic 5 |
Key time interval: | Aquitanian | ||
Age range of interval: | 23.03000 - 20.44000 m.y. ago |
Stratigraphy
Formation: | Monte Leon | ||||
Stratigraphic resolution: | formation | ||||
Stratigraphy comments: Age after Parras et al 2008
Parras et al., 2008: No isotopic data are available on the lower part of the Monte León Formation, and the only radiometric 40Ar/39Ar age of 19.33 Ma is from the top of the unit (Fleagle et al., 1995). The 87Sr/86Sr age of 23.83 and 24.12 Ma (latest Oligocene) drawn from top of the San Julián Formation immediately be- low its contact with the overlying Monte León Formation at Cabo Curioso, suggest that the age of the latter at the localities along the coast should lie between 24.12 and 19.33 Ma, i.e., latest Oligo- cene or more probably early Miocene (see Fig. 8). |
Lithology and environment
Primary lithology: | tuffaceous,gray siltstone |
Secondary lithology: | tuffaceous,gray sandstone |
Includes fossils? | Y |
Lithology description: light gray tuffaceous siltsones and sandstones | |
Environment: | marginal marine indet. |
Taphonomy
Modes of preservation: | body,original phosphate |
Size of fossils: | macrofossils |
Collection methods and comments
Reason for describing collection: | taxonomic analysis |
Metadata
Database number: | 45887 | ||
Authorizer: | M. Uhen | Enterer: | M. Uhen |
Modifier: | M. Kouvari | Research group: | marine invertebrate,vertebrate |
Created: | 2004-12-12 08:39:34 | Last modified: | 2020-09-21 01:46:29 |
Access level: | the public | Released: | 2004-12-12 08:39:34 |
Creative Commons license: | CC BY |
Reference information
Primary reference:
12217. | A. L. Cione and M. A. Cozzuol. 1990. Reidentification of Portheus patagonicus Ameghino, 1901, a supposed fish from the Middle Tertiary of Patagonia as a delphinoid cetacean. Journal of Paleontology 64(3):451-453 [M. Uhen/M. Uhen/J. Alroy] |
Secondary references:
12218 | F. Ameghino. 1901. L' age des Formations sedimentaires de Patagonie. Anales de la Sociedad Cientifica Argentina 52:189-197 [M. Uhen/M. Uhen/M. Uhen] | |
14629 | A. Bravard. 1858. Monografia de los terrenos marinos terciarios, de las cercanias del Parana. Annales Museo Nacional de Buenos Aires 3:45-94 [M. Uhen/M. Uhen/M. Uhen] | |
25128 | G. G. Simpson. 1946. Fossil Penguins. Bulletin of the American Museum of Natural History 87(1):1-100 [M. Uhen/M. Uhen] | |
25177 | G. G. Simpson. 1972. Conspectus of Patagonian fossil penguins. American Museum Novitates 2488:1-37 [M. Uhen/M. Uhen] |