Lo Valdés Formation, Rio Volcán, Santiago Province, Units IV-VI: Berriasian, Chile
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Bivalvia
- Mytilida
- Mytilidae
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Modiolus sp.
(Lamarck 1801)
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Bivalvia
- Arcida
- Cucullaeidae
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Cucullaea gabrielis
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Bivalvia
- Myalinida
- Inoceramidae
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Inoceramus sp.
Sowerby 1814
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Bivalvia
- Ostreida
- Ostreidae
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"Ostrea" lotenoensis
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Bivalvia
- Ostreida
- Gryphaeidae
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Gryphaea santiaguensis
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Gryphaea cf. balli
(Stefanini 1925)
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Exogyra imbricata
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Bivalvia
- Ostreida
- Pinnidae
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Pinna cf. robinaldina
d'Orbigny 1844
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Bivalvia
- Ostreida
- Malleidae
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Isognomon cf. ricordiana
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Bivalvia
- Ostreida
- Bakevelliidae
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Gervillaria leufuensis
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Bivalvia
- Pectinida
- Limidae
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Plagiostoma sp.
Sowerby 1814
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Pseudolimea sp.
Douglas and Arkell 1932
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Bivalvia
- Carditida
- Crassatellidae
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Ptychomya koeneni
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Bivalvia
- Carditida
- Astartidae
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Eriphyla argentina
Burckh and Weaver 1907
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Bivalvia
- Lucinida
- Lucinidae
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"Lucina" leufuensis
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"Lucina" neuquensis
Haupt 1907
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Bivalvia
- Cardiida
- Kalenteridae
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Myoconcha transatlantica
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Bivalvia
- Cardiida
- Arcticidae
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"Cyprina" argentina
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| synonym of Arctica | ||||||||||
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Bivalvia
- Cardiida
- Glossidae
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"Isocardia" koeneni
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Bivalvia
- Hiatellida
- Hiatellidae
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Panopaea dupinian
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| corrected as Panopea | ||||||||||
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Bivalvia
- Pholadomyida
- Pholadomyidae
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Pholadomya sanctacrucis
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| P. sancta-crucis | ||||||||||
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Pholadomya gigantea
(Sowerby 1836)
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Girardotia dupiniana
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Bivalvia
- Trigoniida
- Trigoniidae
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Iotrigonia sp.
Van Hoepen 1929
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| spelled with current rank as Megatrigonia (Iotrigonia) | ||||||||||
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Bivalvia
- Nuculida
- Nuculidae
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Nucula sp.
Lamarck 1799
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| see common names | ||||||||||
Geography
| Country: | Chile |
| Coordinates: | 33.8° South, 70.1° West (view map) |
| Paleocoordinates: | 32.6° South, 33.5° West |
| Basis of coordinate: | estimated from map |
| Geographic resolution: | local area |
Time
| Period: | Cretaceous | Epoch: | Early/Lower Cretaceous |
| Stage: | Berriasian | 10 m.y. bin: | Cretaceous 1 |
| Key time interval: | Berriasian | ||
| Age range of interval: | 145.00000 - 139.80000 m.y. ago |
Stratigraphy
| Geological group: | Mendoza | Formation: | Lo Valdés | Member: | Units IV-VI |
| Local order: | bottom to top | ||||
| Stratigraphic resolution: | group of beds | ||||
| Stratigraphy comments: Unit IV: 110 m.
Unit V and VI: 100 m. | |||||
Lithology and environment
| Primary lithology: | shelly/skeletal lithified wackestone | ||
| Secondary lithology: | lithified "shale" | ||
| Lithology description: Organic-rich partly laminated microsparite limestones and shales. | |||
| Environment: | offshore ramp | Tectonic setting: | back-arc basin |
| Geology comments: Characteristic of oxygen-deficient, quiet-water environments and represents deeper-water facies than the Tithonian and Upper Valanginian parts which are shallow neritic; shallow back-arc basin. | |||
Taphonomy
| Size of fossils: | macrofossils |
Collection methods and comments
| Reason for describing collection: | paleoecologic analysis |
Metadata
| Database number: | 57145 | ||
| Authorizer: | M. Aberhan | Enterer: | S. Nurnberg |
| Modifier: | S. Nurnberg | Research group: | marine invertebrate |
| Created: | 2005-12-06 01:29:36 | Last modified: | 2005-12-06 04:25:19 |
| Access level: | the public | Released: | 2005-12-06 01:29:36 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 12505. | A. Hallam, L. Biró-Bagóczky, and E. Perez. 1986. Facies analysis of the Lo Valdés Formation (Tithonian-Hauterivian) of the High Cordillera of Central Chile, and the palaeogeographic evolution of the Andean Basin. Geological Magazine 123(4):425-435 [M. Aberhan/S. Nurnberg/S. Nurnberg] |