Chota Formation

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Chota Formation
Stratigraphic range: Early Campanian-Late Eocene
~83–35 Ma
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TypeGeological formation
Sub-unitsEsperanza Mb.
Rentema Mb.
Fundo El Triunfo Mb.
UnderliesCajaruro Formation
OverliesCelendín Formation
Thickness320 m (1,050 ft)
Lithology
PrimaryShale, sandstone
OtherGypsum
Location
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Approximate paleocoordinatesLua error: callParserFunction: function "#coordinates" was not found.
RegionCajamarca
CountryPeru
ExtentBagua Basin
Type section
Named forChota
Named byBroggi
LocationEsperanza, Cajamarca
Year defined1942
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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

Color key
Taxon Reclassified taxon Taxon falsely reported as present Dubious taxon or junior synonym Ichnotaxon Ootaxon Morphotaxon
Notes
Uncertain or tentative taxa are in small text; crossed out taxa are discredited.

Dinosaurs

Sauropods

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

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

Fishes of the Chota Formation
Genus Species Location Stratigraphic position Material Notes Images
Pucabatis P. hoffstetteri Cajamarca Maastrichtian A rhombodontid rajiform

See also

References

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  1. ^ Weishampel, et al. (2004). "Dinosaur distribution." Pp. 517-607.
  2. ^ Chacaltana et al., 2014
  3. ^ Page Module:Citation/CS1/styles.css has no content.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.
  4. ^ Page Module:Citation/CS1/styles.css has no content.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

Further reading

  • Page Module:Citation/CS1/styles.css has no content.Aliaga Chávez, Manuel Jesús, Estudio geológico (PDF), UNMSM, pp. 1–22, retrieved 2017-06-05
  • Page Module:Citation/CS1/styles.css has no content.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
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