Arroyo Truquico, Agrio Formation, 120m (M1), Neuquen Basin: Late/Upper Valanginian, Argentina
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Cephalopoda
- Ammonitida
- Neocomitidae
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Karakaschiceras attenuatus
(Behrendsen 1892)
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| see common names | |||||||
Geography
| Country: | Argentina |
| Coordinates: | 37.4° South, 70.3° West (view map) |
| Paleocoordinates: | 36.5° South, 33.5° West |
| Basis of coordinate: | estimated from map |
| Geographic resolution: | outcrop |
Time
| Period: | Cretaceous | Epoch: | Early/Lower Cretaceous |
| Stage: | Valanginian | 10 m.y. bin: | Cretaceous 1 |
| Key time interval: | Late/Upper Valanginian | ||
| Age range of interval: | 139.80000 - 132.60000 m.y. ago |
Stratigraphy
| Geological group: | Mendoza | Formation: | Agrio | Member: | Lower |
| Local section: | Arroyo Truquico | Local bed: | 120 m | ||
| Local order: | top to bottom | ||||
| Stratigraphic resolution: | bed | ||||
| Stratigraphy comments: = horizon M1 | |||||
Lithology and environment
| Primary lithology: | shelly/skeletal lithified "limestone" |
| Secondary lithology: | lithified "shale" |
| Lithology description: thin calcareous coquinas and shales | |
| Environment: | transition zone/lower shoreface |
| Glacial or sequence phase: | transgressive |
| Geology comments: ' A transgressive phase started in mid-Valanginian time with the deposition of black shales and limestones of the Argio Fm.'
'shoreface to offshore paleoenvironments on a storm-dominated, shallow marine ramp' (see PBDB coll. 50185) | |
Taphonomy
| Size of fossils: | macrofossils |
Collection methods and comments
| Collection methods: | field collection |
| Reason for describing collection: | taxonomic analysis |
Metadata
| Database number: | 65435 | ||
| Authorizer: | M. Aberhan | Enterer: | S. Nurnberg |
| Modifier: | S. Nurnberg | Research group: | marine invertebrate |
| Created: | 2006-09-22 05:35:45 | Last modified: | 2006-12-05 04:04:15 |
| Access level: | the public | Released: | 2006-09-22 05:35:45 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 18861. | M. B. Aguirre-Urreta. 1998. The ammonites Karakaschiceras and Neohoploceras (Valanginian Neocomitidae) from the Neuquen Basin, West-Central Argentina. Journal of Paleontology 72:39-59 [M. Aberhan/S. Nurnberg] |