Mallin Quemado, Neuquen Province, MQ-III-43: Late Tithonian, Argentina
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Cephalopoda
- Ammonitida
- Neocomitidae
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Blanfordiceras cf. wallichi
(Gray 1832)
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| see common names | |||||||
Geography
| Country: | Argentina |
| Coordinates: | 38.6° South, 70.1° West (view map) |
| Paleocoordinates: | 36.8° South, 32.4° West |
| Basis of coordinate: | estimated from map |
Time
| Period: | Jurassic | Epoch: | Late Jurassic |
| Stage: | Tithonian | 10 m.y. bin: | Jurassic 6 |
| Key time interval: | Late Tithonian | Ammonoid zone: | Alternans |
| Age range of interval: | 146.3 - 145 m.y. ago |
Stratigraphy
| Formation: | Vaca Muerta | Member: | Pichi Moncol | ||
| Local section: | MQ-III | Local bed: | 43 | ||
| Local order: | bottom to top | ||||
| Stratigraphic resolution: | bed | ||||
| Stratigraphy comments: The Vaca Muerta Fm. in transect MQ-III, although not observed up to its uppermost part (locally assigned to the Koeneni Z.) shows the three characteristic lithostratigraphic subdivisions, from below: the Portada Covunco, Los Catutos and Pichi Moncol (pars) members. | |||||
Lithology and environment
| Primary lithology: | lithified sandy "shale" |
| Includes fossils? | Y |
| Lithology description: In transect MQ-III, the deposits of the Portada Covunco Mb. show a monotonous succession of black shales and sandy shales, rich in organic matter with thin intercalations of calcareous lutite, laminated calcareous sandstones, and wacky sandstones. Upwards in the succession of transect MQ-III carbonate facies dominate, consisting of marls and marly limestones with intercalations of black shales (Los Catutos Mb.), then culminating with a partial exposure of the Pichi Moncol Mb. represented by a domain of sandy shales showing variable contents of organic matter. | |
| Environment: | marine indet. |
| Geology comments: Palaeogeographically the Sierra Vaca Muerta has a position close to the depocentre area of the basin. | |
Taphonomy
| Modes of preservation: | body,cast,original aragonite |
| Size of fossils: | macrofossils |
Collection methods and comments
| Reason for describing collection: | biostratigraphic analysis |
Metadata
| Database number: | 200703 | ||
| Authorizer: | A. Kocsis | Enterer: | M. Gomez Correa | Research group: | marine invertebrate |
| Created: | 2019-04-13 08:24:03 | Last modified: | 2019-04-13 08:24:03 |
| Access level: | authorizer only | Released: | 2021-04-13 08:24:03 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 68587. | A. C. Garrido, H. Parent, and L. Brambilla. 2018. Tithonian stratigraphy and ammonite fauna of the Vaca Muerta Formation in Mallín Quemado (Neuquén Basin, Argentina), with remarks on the Andean chronostratigraphy. Volumina Jurassica XVI(1):1-26 [A. Kocsis/M. Gomez Correa] |