| Chota Formation | |
|---|---|
| Stratigraphic range: Early Campanian-Late Eocene ~ | |
| Type | Geological formation |
| Sub-units | Esperanza Mb. Rentema Mb. Fundo El Triunfo Mb. |
| Underlies | Cajaruro Formation |
| Overlies | Celendín Formation |
| Thickness | 320 m (1,050 ft) |
| Lithology | |
| Primary | Shale, sandstone |
| Other | Gypsum |
| Location | |
| Coordinates | 5°41′41″S 78°30′41″W / 5.69472°S 78.51139°W |
| Approximate paleocoordinates | 7°30′S 60°36′W / 7.5°S 60.6°W |
| Region | Cajamarca |
| Country | Peru |
| Extent | Bagua Basin |
| Type section | |
| Named for | Chota |
| Named by | Broggi |
| Location | Esperanza, Cajamarca |
| Year defined | 1942 |
 Chota Formation (Peru) | |
The Chota Formation is an Early Campanian to Late Eocene geologic formation of the Cajamarca and western Amazonas Region in northern Peru. Dinosaur remains are among the fossils that have been recovered from the formation, although none have yet been referred to a specific genus ("Baguasaurus").[1] The formation was formerly named Bagua Formation.[2]
Fossil content
[edit]Color key
|
Notes Uncertain or tentative taxa are in small text; |
Dinosaurs
[edit]Sauropods
[edit]| Sauropods of the Chota Formation | ||||||
|---|---|---|---|---|---|---|
| Genus | Species | Location | Stratigraphic position | Material | Notes | Images |
| Lithostrotia indet. | Indeterminate | Cajamarca | Campanian to Maastrichtian | A Lithostrotian titanosaur; informally known as "Baguasaurus". | ||
Crocodylomorphs
[edit]| Crocodylomorph of the Chota Formation | ||||||
|---|---|---|---|---|---|---|
| Genus | Species | Location | Stratigraphic position | Material | Notes | Images |
| Crocodylomorpha indet.[3] | Indeterminate | Cajamarca | Campanian to Maastrichtian | Teeth | Possibly a Notosuchia; previously known as Spinosauridae.[4] | |
Fish
[edit]| Fishes of the Chota Formation | ||||||
|---|---|---|---|---|---|---|
| Genus | Species | Location | Stratigraphic position | Material | Notes | Images |
| Pucabatis | P. hoffstetteri | Cajamarca | Maastrichtian | A rhombodontid rajiform | ||
See also
[edit]References
[edit]- ^ Weishampel, et al. (2004). "Dinosaur distribution." Pp. 517-607.
- ^ Chacaltana et al., 2014
- ^ Barker, Chris T.; Naish, D.; Gostling, Neil J. (2025). "Insufficient Evidence for Spinosaurid Survival into the Latest Cretaceous: A Comment on Olmedo-Romaña et al. (2025)". Ameghiniana. doi:10.5710/AMGH.10.12.2025.3673.
- ^ Olmedo-Romaña, G. J.; Wilson Mantilla, J. A.; Tejada, J. V.; Antoine, P. O.; Burga-Castillo, M. A.; Aliaga-Castillo, A. V.; Varas-Malca, R.; Benites-Palomino, A.; Salas-Gismondi, R. (2025). "Theropod and sauropod dinosaurs from the Campanian-Maastrichtian Bagua Basin of Perú, including the first possible report of Spinosauridae in western South America". Ameghiniana. 62 (4): 259–287. doi:10.5710/AMGH.13.02.2025.3627.
Bibliography
[edit]- Chacaltana, César; Benites Cañote, Alexandra Lucytania; Valdivia, Waldir; Chumpitaz, Marco (2014), La formación Chota en la Cuenca Bagua: Evaluación e implicancias del criterio de clasificación litoestratigráfico, Congreso Peruano de Geología, pp. 1–4, retrieved 2017-06-05
- Weishampel, David B.; Dodson, Peter; Osmólska, Halszka (2004), The Dinosauria, 2nd edition, Berkeley: University of California Press, pp. 1–880, ISBN 0-520-24209-2, retrieved 2019-02-21
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Further reading
[edit]- Aliaga Chávez, Manuel Jesús, Estudio geológico (PDF), UNMSM, pp. 1–22, retrieved 2017-06-05
- Cruzado Vásquez, Gilberto (2009), Estudio de geología (PDF), Gobierno regional de Cajamarca, pp. 1–90, retrieved 2017-06-05
- T. Mourier, P. Bengtson, M. Bonhomme, E. Buge, H. Cappetta, J.-Y. Crochet, M. Feist, K. F. Hirsch, E. Jaillard, G. Laubacher, J. P. Lefranc, M. Moullade, C. Noblet, D. Pons, J. Rey, B. Sigé, Y. Tambareau and P. Taquet. 1988. The Upper Cretaceous–Lower Tertiary marine to continental transition in the Bagua Basin, northern Peru: paleontology, biostratigraphy, radiometry, correlations. Newsletters on Stratigraphy 19(3):143-177