The Early to Late Cretaceous (Albian–Cenomanian) transition in Putumayo, Colombia: A biostratigraphic and carbon isotope stratigraphic correlation for northwestern South America

Despite the rich geological and paleontological record of Colombia, the Putumayo region near Ecuador remains one of the least explored regions in the equatorial Neotropics, mainly due to its thick vegetation, deep rock weathering, soil formation and ground cover, geographic remoteness, and inaccessi...

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Published inPalaeoworld Vol. 34; no. 1; p. 100869
Main Authors Luque, Javier, Bustos, Jonatan, Páez-Reyes, Manuel, Beltrán-Triviño, Alejandro, Rodríguez, Angie, Delgado, Alexandra, Sánchez, Johan M., Caraballo, Julián, López-Horgue, Mikel A.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.02.2025
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ISSN1871-174X
DOI10.1016/j.palwor.2024.05.011

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Abstract Despite the rich geological and paleontological record of Colombia, the Putumayo region near Ecuador remains one of the least explored regions in the equatorial Neotropics, mainly due to its thick vegetation, deep rock weathering, soil formation and ground cover, geographic remoteness, and inaccessibility of well-exposed outcrops. This has resulted in limited comparisons with neighboring basins and thus the generation of more comprehensive biostratigraphic correlations with western and northern South America, as well as other paleobiogeographic regions (e.g., Tethys, Western Interior Seaway). Here, we present 67 occurrences of uppermost Lower Cretaceous to lowermost Upper Cretaceous ammonoids and other macrofossils (e.g., bivalves, decapod crustaceans, osteichthyan fish remains, plant remains), as well as a δ13Corg chemostratigraphic curve derived from 105 samples from the middle Albian of the uppermost Caballos Formation and the upper Albian to lower Cenomanian lower Villeta Formation, collected in situ from a stratigraphic section exposed along the Mocoa–San Francisco Road, Putumayo, Colombia, here called the San Francisco section. The chemostratigraphic, carbon-isotope curve for the region shows a great similarity with the shape of the accepted curve for the late Albian Oceanic Anoxic Event 1d, which is characterized by a worldwide long positive δ13C excursion anomaly. The new biostratigraphic and isotopic data serve as a point of reference to compare the Putumayo Basin with neighboring basins (e.g., Marañon Basin in Perú, Oriente Basin in Ecuador, Upper Magdalena Valley Basin in Colombia), and thus the generation of more comprehensive upper Lower Cretaceous and lower Upper Cretaceous biostratigraphic and chemostratigraphic correlations for northwestern South America.
AbstractList Despite the rich geological and paleontological record of Colombia, the Putumayo region near Ecuador remains one of the least explored regions in the equatorial Neotropics, mainly due to its thick vegetation, deep rock weathering, soil formation and ground cover, geographic remoteness, and inaccessibility of well-exposed outcrops. This has resulted in limited comparisons with neighboring basins and thus the generation of more comprehensive biostratigraphic correlations with western and northern South America, as well as other paleobiogeographic regions (e.g., Tethys, Western Interior Seaway). Here, we present 67 occurrences of uppermost Lower Cretaceous to lowermost Upper Cretaceous ammonoids and other macrofossils (e.g., bivalves, decapod crustaceans, osteichthyan fish remains, plant remains), as well as a δ13Corg chemostratigraphic curve derived from 105 samples from the middle Albian of the uppermost Caballos Formation and the upper Albian to lower Cenomanian lower Villeta Formation, collected in situ from a stratigraphic section exposed along the Mocoa–San Francisco Road, Putumayo, Colombia, here called the San Francisco section. The chemostratigraphic, carbon-isotope curve for the region shows a great similarity with the shape of the accepted curve for the late Albian Oceanic Anoxic Event 1d, which is characterized by a worldwide long positive δ13C excursion anomaly. The new biostratigraphic and isotopic data serve as a point of reference to compare the Putumayo Basin with neighboring basins (e.g., Marañon Basin in Perú, Oriente Basin in Ecuador, Upper Magdalena Valley Basin in Colombia), and thus the generation of more comprehensive upper Lower Cretaceous and lower Upper Cretaceous biostratigraphic and chemostratigraphic correlations for northwestern South America.
ArticleNumber 100869
Author Bustos, Jonatan
Delgado, Alexandra
Sánchez, Johan M.
Caraballo, Julián
Páez-Reyes, Manuel
Luque, Javier
Rodríguez, Angie
López-Horgue, Mikel A.
Beltrán-Triviño, Alejandro
Author_xml – sequence: 1
  givenname: Javier
  surname: Luque
  fullname: Luque, Javier
  email: jl2351@cam.ac.uk
  organization: Museum of Zoology, Department of Zoology, University of Cambridge, Downing Street, Cambridge CB2 3EJ, UK
– sequence: 2
  givenname: Jonatan
  surname: Bustos
  fullname: Bustos, Jonatan
  email: jabustoss@unal.edu.co
  organization: School of Applied Sciences and Engineering, EAFIT University, Medellin 050022, Colombia
– sequence: 3
  givenname: Manuel
  surname: Páez-Reyes
  fullname: Páez-Reyes, Manuel
  email: manuel.paez@gmail.com
  organization: School of Applied Sciences and Engineering, EAFIT University, Medellin 050022, Colombia
– sequence: 4
  givenname: Alejandro
  surname: Beltrán-Triviño
  fullname: Beltrán-Triviño, Alejandro
  organization: School of Applied Sciences and Engineering, EAFIT University, Medellin 050022, Colombia
– sequence: 5
  givenname: Angie
  surname: Rodríguez
  fullname: Rodríguez, Angie
  organization: School of Applied Sciences and Engineering, EAFIT University, Medellin 050022, Colombia
– sequence: 6
  givenname: Alexandra
  surname: Delgado
  fullname: Delgado, Alexandra
  organization: Geologia Saila, Faculty of Science and Technology, University of the Basque Country UPV/EHU, 48940 Leioa (Biscay), Basque Country, Spain
– sequence: 7
  givenname: Johan M.
  surname: Sánchez
  fullname: Sánchez, Johan M.
  organization: Geologia Saila, Faculty of Science and Technology, University of the Basque Country UPV/EHU, 48940 Leioa (Biscay), Basque Country, Spain
– sequence: 8
  givenname: Julián
  surname: Caraballo
  fullname: Caraballo, Julián
  organization: School of Applied Sciences and Engineering, EAFIT University, Medellin 050022, Colombia
– sequence: 9
  givenname: Mikel A.
  surname: López-Horgue
  fullname: López-Horgue, Mikel A.
  email: mikel.lopezhorgue@ehu.eus
  organization: Geologia Saila, Faculty of Science and Technology, University of the Basque Country UPV/EHU, 48940 Leioa (Biscay), Basque Country, Spain
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Keywords Geochemistry
Villeta Formation
Upper Cretaceous
Lower Cretaceous
Paleontology
Biostratigraphy
Language English
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Snippet Despite the rich geological and paleontological record of Colombia, the Putumayo region near Ecuador remains one of the least explored regions in the...
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SubjectTerms Biostratigraphy
Geochemistry
Lower Cretaceous
Paleontology
Upper Cretaceous
Villeta Formation
Title The Early to Late Cretaceous (Albian–Cenomanian) transition in Putumayo, Colombia: A biostratigraphic and carbon isotope stratigraphic correlation for northwestern South America
URI https://dx.doi.org/10.1016/j.palwor.2024.05.011
Volume 34
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