La Meseta, east of Casa Chiguaje: Early/Lower Pliocene, Venezuela
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Mammalia
- Cetacea
- Iniidae
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cf. Ischyrorhynchus vanbenedeni
Ameghino 1891
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1 specimen | ||||||
| see common names | |||||||
Geography
| Country: | Venezuela |
| Coordinates: | 11.3° South, 70.2° West (view map) |
| Paleocoordinates: | 11.4° South, 69.3° West |
Time
| Period: | Neogene | Epoch: | Pliocene |
| Stage: | Zanclean | 10 m.y. bin: | Cenozoic 6 |
| Key time interval: | Early/Lower Pliocene | ||
| Age range of interval: | 5.33300 - 3.60000 m.y. ago |
Stratigraphy
| Formation: | Codore | Member: | Chiguaje | ||
| Stratigraphic resolution: | member | ||||
| Stratigraphy comments: This collection had a L. Miocene age assigned. However: The Codore formation is divided into three formal members: El Jebe, Chiguaje, and Algodones. The El Jebe and Algodones Members were deposited in a fluvial environment, whereas the Chiguaje Member represents a marine transgression (Quiroz and Jaramillo, 2010) and records cetaceans (Aguirre-Fernández et al., 2017a; 2017b). The age of the Codore Formation is regarded as late Miocene to early Pliocene based on the presence of the palynomorph Echitricolporites spinosus (Hambalek et al., 1994; Quiroz and Jaramillo, 2010). The contact of the underlying Urumaco Formation and the Codore Formation is at ca. 6 Ma according to Smith et al. (2010). Foraminiferans of the Chiguaje Member are indicative of the early to middle Pliocene (ca. 4–3 Ma; Smith et al., 2010:fig. 2). | |||||
Lithology and environment
| Primary lithology: | gray "shale" |
| Includes fossils? | Y |
| Lithology description: dark gray laminated mudstone and shale interbedded with muddy sandstone containing abundant mollusk fragments grading to limestones with oysters | |
| Environment: | marine indet. |
| Geology comments: The Chiguaje Member represents a short transgressive event between two continental members (i.e., El Jebe and Algodones, Hambalek et al. 1994). | |
Taphonomy
| Modes of preservation: | body |
| Size of fossils: | macrofossils |
Collection methods and comments
| Reason for describing collection: | general faunal/floral analysis |
Metadata
| Database number: | 127083 | ||
| Authorizer: | M. Uhen | Enterer: | M. Shalap, M. Uhen |
| Modifier: | M. Kouvari | Research group: | vertebrate |
| Created: | 2012-04-24 01:41:56 | Last modified: | 2020-09-11 10:15:35 |
| Access level: | the public | Released: | 2012-04-24 01:41:56 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 60350. | G. Aguirre-Fernández, J. D. Carillo-Briceño, R. Sánchez, E. Amsson, and M. R. Sánchez-Villagra. 2017. Fossil Cetaceans (Mammalia, Cetacea) from the Neogene of Colombia and Venezuela. Journal of Mammalian Evolution 24(1):71-90 [M. Uhen/M. Uhen/M. Uhen] |