Arroyo Truquico, Agrio Formation, 124m (M2), Neuquen Basin: Late Valanginian, Argentina
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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 Cretaceous |
Stage: | Valanginian | 10 m.y. bin: | Cretaceous 1 |
Key time interval: | Late Valanginian | ||
Age range of interval: | 139.8 - 132.6 m.y. ago |
Stratigraphy
Geological group: | Mendoza | Formation: | Agrio | Member: | Lower |
Local section: | Arroyo Truquico | Local bed: | 124 m | ||
Local order: | top to bottom | ||||
Stratigraphic resolution: | bed | ||||
Stratigraphy comments: = horizon M2 |
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: | 65436 | ||
Authorizer: | M. Aberhan | Enterer: | S. Nurnberg |
Modifier: | S. Nurnberg | Research group: | marine invertebrate |
Created: | 2006-09-22 05:38:00 | Last modified: | 2006-12-05 04:08:34 |
Access level: | the public | Released: | 2006-09-22 05:38:00 |
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] |