Chota Formation

Last updated
Chota Formation
Stratigraphic range: Early Campanian-Late Eocene
~83–35  Ma
Type Geological formation
Sub-unitsEsperanza Mb.
Rentema Mb.
Fundo El Triunfo Mb.
Underlies Cajaruro Formation
Overlies Celendín Formation
Thickness320 m (1,050 ft)
Lithology
Primary Shale, sandstone
Other Gypsum
Location
Coordinates 5°41′41″S78°30′41″W / 5.69472°S 78.51139°W / -5.69472; -78.51139
Approximate paleocoordinates 7°30′S60°36′W / 7.5°S 60.6°W / -7.5; -60.6
Region Cajamarca
Country Peru
Extent Bagua Basin
Type section
Named for Chota
Named byBroggi
LocationEsperanza, Cajamarca
Year defined1942
Peru physical map.svg
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]

Contents

Fossil content

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

Dinosaurs

Saurischians

Sauropods of the Chota Formation
GenusSpeciesLocationStratigraphic positionMaterialNotesImages
Lithostrotia Indet.Indeterminate Cajamarca Campanian to Maastrichtian A lithostrotian titanosaur; informally known as "Baguasaurus".
Spinosauridae Indet?Indeterminate Campanian to Maastrichtian A possible spinosaurid, probably one of the latest records of the group. [3]

Fish

Cartilaginous Fish

Cartilaginous Fish of the Chota Formation
GenusSpeciesLocationStratigraphic positionMaterialNotesImages
Pucabatis P. hoffstetteriMaatrichtianA rhombodontid rajiform

See also

References

  1. Weishampel, et al. (2004). "Dinosaur distribution." Pp. 517-607.
  2. Chacaltana et al., 2014
  3. Olmedo-Romaña, Giancarlo; Wilson Mantilla, Jeffrey; Tejada, Julia; Olivier Antoine, Pierre; Burga-Castillo, Manuel; Aliaga-Castillo, Angélica; Varas-Malca, Rafael; Benites-Palomino, Aldo; Salas-Gismondi, Rodolfo (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. doi:10.5710/amgh.13.02.2025.3627. ISSN   0002-7014.

Bibliography

Further reading