Gran Bajo de San Julian - San Julian Fm: Early/Lower Oligocene, Argentina
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
|
unclassified
|
|||||||
|
Valdesia (Juliana) seudocollaris
|
|||||||
|
Gastropoda
- Solariellidae
|
|||||||
|
Solariella osborni
|
|||||||
|
Gastropoda
- Neotaenioglossa
- Calyptraeidae
|
|||||||
|
"Calyptraea" juliana
|
|||||||
|
"Calyptraea" pileus
Lamarck 1822
|
|||||||
|
Gastropoda
- Turritellidae
|
|||||||
|
Turritella patagonica
|
|||||||
|
Gastropoda
- Epitoniidae
|
|||||||
|
Cirsotrema rugulosa
|
|||||||
|
Gastropoda
- Hipponicidae
|
|||||||
|
Hipponix costata
|
|||||||
|
Gastropoda
- Neogastropoda
- Volutidae
|
|||||||
|
"Proscaphella" gracilior
(Ihering 1896)
|
|||||||
| synonym of Miomelon gracilis | |||||||
|
Gastropoda
- Neogastropoda
- Muricidae
|
|||||||
|
Trophon santacrucensis
Ihering 1897
|
|||||||
|
Gastropoda
- Struthiolariidae
|
|||||||
|
Struthiolarella ornata
|
|||||||
|
Gastropoda
- Naticidae
|
|||||||
|
"Polynices" secunda
|
|||||||
| original and current combination Polinices | |||||||
|
"Polynices" subtenuis
Ihering 1907
|
|||||||
| recombined as Polinices subtenuis | |||||||
|
Bivalvia
- Nuculanida
- Malletiidae
|
|||||||
|
Neilo (Neilo) ortmanni
|
|||||||
|
Bivalvia
- Carditida
- Crassatellidae
|
|||||||
|
Spissatella longior
|
|||||||
|
Crassatella kokeni
|
|||||||
|
Bivalvia
- Carditida
- Carditidae
|
|||||||
|
Fasciculicardia inaequalis
|
|||||||
| original and current combination Glyptoactis (Fasciculicardia) | |||||||
|
Pleuromeris sulcolunularis
|
|||||||
|
Pleuromeris camaronesia
|
|||||||
|
Pleuromeris cannada
|
|||||||
|
Bivalvia
- Lucinida
- Lucinidae
|
|||||||
|
Pteromyrtea crucialis
|
|||||||
|
Bivalvia
- Hiatellida
- Hiatellidae
|
|||||||
|
Panopea sierrana
|
|||||||
|
Bivalvia
- Pholadida
- Pholadidae
|
|||||||
|
Pholadidea patagonica
(Philippi 1887)
|
|||||||
|
Bivalvia
- Pholadida
- Corbulidae
|
|||||||
|
Corbula juliana
|
|||||||
|
Bivalvia
- Cardiida
- Veneridae
|
|||||||
|
Dosinia laeviuscula
|
|||||||
|
Dosinia burmeisteri
|
|||||||
|
Dosinia meridonalis
Ihering 1897
|
|||||||
|
"Chione" patagonica
(Philippi 1887)
|
|||||||
|
Austrocallista iheringi
(Cossmann 1898)
|
|||||||
|
Pitar julianum
|
|||||||
|
Bivalvia
- Cardiida
- Cardiidae
|
|||||||
|
"Cardium" pisum
Philippi 1887
|
|||||||
|
Bivalvia
- Mytilida
- Mytilidae
|
|||||||
|
Modiolus ameghinoi
(Ihering 1907)
|
|||||||
|
Aulacomya cf. ater
(Molina 1782)
|
|||||||
| recombined as Aulacomya atra | |||||||
|
Bivalvia
- Arcida
- Parallelodontidae
|
|||||||
|
Cucullaea darwini
(Philippi 1887)
|
|||||||
| recombined as Cucullaria darwini | |||||||
|
Bivalvia
- Arcida
- Glycymerididae
|
|||||||
|
Glycymeris (Glycymeris) pseudocuevensis
|
|||||||
|
Bivalvia
- Arcida
- Cucullaeidae
|
|||||||
|
Cucullaea (Monteleonia) marshalli
Zinsmeister 1981
|
|||||||
|
Bivalvia
- Arcida
- Arcidae
|
|||||||
|
Arca (Barbatia) juliana
|
|||||||
| original and current combination Barbatia | |||||||
|
Arca puntaensis
|
|||||||
|
Bivalvia
- Arcida
- Limopsidae
|
|||||||
|
Limopsis insolita
(Sowerby 1846)
|
|||||||
|
Bivalvia
- Ostreida
- Ostreidae
|
|||||||
|
Crassostrea hatcheri
(Ihering 1899)
|
|||||||
|
Bivalvia
- Pectinida
- Anomiidae
|
|||||||
|
Parinomya juliensis
|
|||||||
|
Parinomya patagonensis
|
|||||||
|
Bivalvia
- Pectinida
- Pectinidae
|
|||||||
|
Zygochlamys geminatus
(Sowerby 1846)
|
|||||||
| recombined as Zygochlamys geminata | |||||||
| see common names | |||||||
Geography
| Country: | Argentina |
| Coordinates: | 49.3° South, 67.7° West (view map) |
| Paleocoordinates: | 51.0° South, 58.6° West |
| 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 - 27.82000 m.y. ago |
Stratigraphy
| Formation: | San Julián | ||||
| Stratigraphic resolution: | group of beds | ||||
| Stratigraphy comments: STRATIGRAPHIC RELATIONS: From beds of the San Julián Fm, which unconformably overlies the Bahia Laura Group and is overlain by the Early Miocene Monte Leon Fm. THICKNESS: From multiple beds within formation that reaches a thickness of 100 m. AGE: Early Oligocene to Late Oligocene according to molluscan biostratigraphy. Assigned to the Early Oligocene based on the presence of Zygochlamys geminatus. STRATIGRAPHIC POSITION: From upper parts of the formation. | |||||
Lithology and environment
| Primary lithology: | "cross stratification",bioturbation unlithified sandstone |
| Secondary lithology: | poorly lithified sandy "limestone" |
| Includes fossils? | Y |
| Includes fossils? | Y |
| Lithology description: SPECIFIC LITHOLOGY: Bioturbated sandstone, cross-bedded sandstone and sandy limestone. LITHIFICATION: Unlithified on the basis of figured specimes. | |
| Environment: | coastal indet. |
| Geology comments: ENVIRONMENT: Environmental data not reported in text. Siliciclastic shallow marine assemblage. | |
Taphonomy
| Modes of preservation: | body |
| Size of fossils: | macrofossils |
Collection methods and comments
| Collection methods: | field collection,survey of museum collection |
| Reason for describing collection: | biostratigraphic analysis |
| Collection method comments: COLLECTOR: List includes both new collections by the author, and examination of museum and previously reported taxa. REPOSITORY: Museo Argentino de Ciencias Naturales Bernadino Rivadavia, Buenos Aires, Argentina. | |
| Taxonomic list comments:COVERAGE: Exhaustive for bivalvia and gastropoda. NOMENCLATURE: Not an authoritaive publication, but providing revised generic placement for many previously reported antiquated names. | |
Metadata
| Database number: | 71402 | ||
| Authorizer: | A. Hendy | Enterer: | A. Hendy |
| Modifier: | A. Hendy | Research group: | marine invertebrate |
| Created: | 2007-04-24 09:35:06 | Last modified: | 2013-11-25 13:37:23 |
| Access level: | authorizer only | Released: | 2008-04-24 09:35:06 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 12860. | C. J. del Rio. 2004. Tertiary Marine Molluscan Assemblages of Eastern Patagonia (Argentina): A Biostratigraphic Analysis. Journal of Paleontology 78(6):1097-1122 [L. Ivany/P. Wall/P. Wall] |