Punta Moreno Fm, Bed COM.50, Chicama Basin: Late Tithonian, Peru
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Cephalopoda
- Ammonitida
- Neocomitidae
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? Substeueroceras sp.
Spath 1922
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| ?Substeueroceras or Parodontoceras sp. | ||||||||||
| see common names | ||||||||||
Geography
| Country: | Peru |
| Coordinates: | 7.6° South, 78.9° West (view map) |
| Paleocoordinates: | 8.0° South, 45.8° West |
| Basis of coordinate: | estimated from map |
| Geographic resolution: | outcrop |
Time
| Period: | Jurassic | Epoch: | Late Jurassic |
| Stage: | Tithonian | 10 m.y. bin: | Jurassic 6 |
| Key time interval: | Late Tithonian | ||
| Age range of interval: | 146.3 - 145 m.y. ago |
Stratigraphy
| Geological group: | Chicama | Formation: | Punta Moreno | Member: | Upper |
| Regional section: | Chicama Basin | Regional bed: | COM.50 | ||
| Regional order: | bottom to top | ||||
| Stratigraphic resolution: | bed | ||||
| Stratigraphy comments: The fauna is ascribed to the Alternans zone of the Andean biochronological standard, which is probably equivalent to the Microcanthum zone of Europe, of early Late Tithonian age. | |||||
Lithology and environment
| Primary lithology: | lithified "siliciclastic" |
| Lithology description: The Punta Moreno Fm. includes two members. The lower member (850m) is made up of thick conglomerates, greywackes and lithic sandtones, deposited on a proximal turbiditic fan or a slope apron by high-density turbidity currents. The upper member (900m) expresses an evolution toward a slope environment characterized by feeding-channels, olistoliths and sedimentary slidings. | |
| Environment: | delta front |
Taphonomy
| Size of fossils: | macrofossils |
Collection methods and comments
| Collection methods: | field collection |
| Reason for describing collection: | biostratigraphic analysis |
| Collection method comments: focus on ammonites | |
Metadata
| Database number: | 66402 | ||
| Authorizer: | M. Aberhan | Enterer: | S. Nurnberg |
| Modifier: | S. Nurnberg | Research group: | marine invertebrate |
| Created: | 2006-10-09 03:12:29 | Last modified: | 2006-10-09 08:01:24 |
| Access level: | the public | Released: | 2006-10-09 03:12:29 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 18979. | R. Enay, G. Barale, J. Jacay and E. Jaillard. 1996. Upper Tithonian Ammonites and Floras from the Chicama Basin, Northern Peruvian Andes. GeoResearch Forum 1-2:221-234 [M. Aberhan/S. Nurnberg/S. Nurnberg] |