Isla Grande de Tierra del Fuego (Early Oligocene): Early/Lower Oligocene, Argentina
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
unclassified
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Pachymagus cf. venter
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Anthozoa
- Scleractinia
- Flabellidae
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Flabellum cf. cuneiforme
(Lonsdale 1845)
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Subspecies: F. cf. cuneiforme wailesi | ||||||||||
Gastropoda
- Neotaenioglossa
- Calyptraeidae
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Calyptraea sp.
Lamarck 1799
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Calyptraea cf. merriami
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Gastropoda
- Turritellidae
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Turritella ambulacrum
Sowerby 1846
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Subspecies: T. ambulacrum sylva | ||||||||||
Gastropoda
- Aporrhaidae
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"Chenopus" santacruzensis
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Gastropoda
- Struthiolariidae
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Struthiolarella densestriata
(Ihering 1897)
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Gastropoda
- Neogastropoda
- Buccinidae
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"Nassa" fueguina
Steinmann and Wilckens 1908
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"Verconella" iheringi
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Austrocominella fueguensis
(Ihering 1907)
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Gastropoda
- Neogastropoda
- Muricidae
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Trophon sp.
Montfort 1810
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Gastropoda
- Neogastropoda
- Volutidae
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Miomelon becki
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Subspecies: M. becki cannada | ||||||||||
Miomelon cf. gracilior
(Ihering 1896)
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synonym of Miomelon gracilis | ||||||||||
Gastropoda
- Naticidae
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Polinices (Euspira) santacruzensis
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original and current combination Euspira | ||||||||||
Polinices (Euspira) sp.
(Agassiz 1837)
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original and current combination Euspira | ||||||||||
Gastropoda
- Heterostropha
- Acteonidae
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"Actaeon" chilensis
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replaced by Acteon | ||||||||||
Bivalvia
- Arcida
- Cucullaeidae
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Cucullaea (Cucullona) alta
Sowerby 1846
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Bivalvia
- Arcida
- Glycymerididae
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Glycymeris cf. cuevensis
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Bivalvia
- Mytilida
- Mytilidae
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Modiolus ameghinoi
(Ihering 1907)
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Bivalvia
- Lucinida
- Lucinidae
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Miltha promaucana
(Philippi 1877)
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recombined as Lucinoma promaucana | ||||||||||
Subspecies: M. promaucana crucialis | ||||||||||
Bivalvia
- Cardiida
- Veneridae
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Eurhomalea cf. fuenzalidai
(Philippi 1887)
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Bivalvia
- Carditida
- Carditidae
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Cardiocardita inaequalis
(Philippi 1887)
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Pleuromeris elegantoides
(Ortman 1902)
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Bivalvia
- Nuculida
- Nuculidae
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Nucula (Leionucula) grandis n. sp.
Malumian et al. 1978
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see common names |
Geography
Country: | Argentina |
Coordinates: | 50.2° South, 72.9° West (view map) |
Paleocoordinates: | 52.1° South, 63.9° West |
Basis of coordinate: | based on nearby landmark |
Geographic resolution: | local area |
Time
Period: | Paleogene | Epoch: | Oligocene |
Stage: | Rupelian | 10 m.y. bin: | Cenozoic 4 |
Key time interval: | Early/Lower Oligocene | ||
Age range of interval: | 33.90000 - 28.40000 m.y. ago |
Stratigraphy
Stratigraphic resolution: | formation | ||||
Stratigraphy comments: STRATIGRAPHIC RELATIONS: Lithostratigraphy not stated. AGE: Paleontological evidence suggests an Eocene to Early Oligocene age for this fauna. Strong faunal similarity to San Julian (Eocene-Oligocene), Monte Leon (Oligocene) and Loreto Formations (Oligocene-Miocene). Several taxa also recorded in the Millongue and Boqueron Formations of Chile. An Oligocene age is assigned here on the basis of commonality in age between correlated formations. STRATIGRAPHIC POSITION: Composite collection from unit within local area. |
Lithology and environment
Primary lithology: | shelly/skeletal poorly lithified conglomeratic sandstone |
Includes fossils? | Y |
Lithology description: SPECIFIC LITHOLOGY: Conglomeratic sandstone containing many skeletal elements. LITHIFICATION: Poorly lithified on the basis of figured specimens (gastropods with sediment filled apertures, sediment adhearing to external surfaces), | |
Environment: | offshore |
Geology comments: ENVIRONMENT: No environmental data reported in text. Faunal composition suggests an inner shelf siliciclastic environment, though not very shallow. |
Taphonomy
Modes of preservation: | body,original aragonite,original calcite |
Degree of concentration: | concentrated |
Size of fossils: | macrofossils |
Preservation of anatomical detail: | good |
Articulated whole bodies: | some |
Collection methods and comments
Collection methods: | selective quarrying,field collection |
Reason for describing collection: | taxonomic analysis |
Collection method comments: COLLECTOR: M. Doello-Jurado, N. Malumian and H. H. Camacho, possibly R. Gorrono, plus existing collections in the Museo Argentino de Ciencias Naturales and Servico Geologico Nacional. REPOSITORY: Museo Argentino de Ciencias Naturales and Servico Geologico Nacional. | |
Taxonomic list comments:COVERAGE: Exhaustive for bivalvia and gastropoda. Corals, brachiopods, foraminifera and palynomorhs apparently also present. NOMENCLATURE: Authoritative publication that appears to use fairly modern nomenclature, and subgeneric and species-level resolution. |
Metadata
Database number: | 66146 | ||
Authorizer: | A. Hendy | Enterer: | A. Hendy | Research group: | marine invertebrate |
Created: | 2006-10-02 11:28:48 | Last modified: | 2013-11-25 13:37:23 |
Access level: | group members | Released: | 2006-10-02 11:28:47 |
Creative Commons license: | CC BY |
Reference information
Primary reference:
18943. | N. Malumian, H. H. Camacho, and R. Gorrono. 1978. Molluscos del Terciario Inferior ("Magallanense") de la Isla Grande de Tierra del Fuego (Republica Argentina). Ameghiniana 15(3-4):265-284 [A. Hendy/A. Hendy] |