The strata of the Lago Colhué Huapé Formation were thought to pertain to the Bajo Barreal Formation, but are now recognized as a distinct stratigraphic unit in their own right.[1][2] The upper part of the Lago Colhué Huapí Formation has been dated to the upper Maastrichtian age of the late Cretaceous period.[3][4] A basalt flow in the formation has been dated to 67.31±0.55million years ago, reinforcing the Late Maastrichtian age.[5]
Vallati, Patricia; Casal, Gabriel; Foix, Nicolás; Allard, José; Tomas, Andrea De Sosa; Calo, Marcos (August 2016). "First Report of a Maastrichtian Palynoflora from the Golfo San Jorge Basin, Central Patagonia, Argentina". Ameghiniana. 53 (4): 495–505. doi:10.5710/AMGH.28.12.2015.2948. ISSN0002-7014.
Ibiricu, Lucio M.; Casal, Gabriel A.; Martínez, Rubén D.; Luna, Marcelo; Svoboda, Ezequiel González; Cerda, Ignacio A. (May 2017). "New materials of lithostrotian titanosaurs (Dinosauria: Sauropoda) from the Upper Cretaceous of central Patagonia". Cretaceous Research. 73: 25–39. doi:10.1016/j.cretres.2016.12.015.
Casal, G. A.; Panzeri, K. M.; Alvarez, B. N.; Cardozo, N. V.; Caglianone, J. L.; Luna, M.; Ibiricu, L. M. (2025). "First record of a lungfish (Sarcopterygii: Dipnoi) in the Upper Cretaceous of the Chubut Group, Golfo San Jorge Basin, Argentina. Paleoenvironmental and paleoclimatic considerations". Cretaceous Research. 176 106192. 106192. Bibcode:2025CrRes.17606192C. doi:10.1016/j.cretres.2025.106192.
Clyde, W.C.; Wilf, P.; Slingerland, Iglesias A.; Barnum, T.; Bijl, P.K. (2014), "New age constraints for the Salamanca Formation and lower Río Chico Group in the western San Jorge Basin, Patagonia, Argentina: implications for Cretaceous—Paleogene extinction recovery and land mammal age correlations", Geological Society of America Bulletin, 126 (3–4): 289–306, Bibcode:2014GSAB..126..289C, doi:10.1130/B30915.1, hdl:11336/80135
Cortés, José María (1986). Estratigrafía y tectónica de la región central de la Provincia de Chubut, República Argentina[Stratigraphy and tectonics of the central region of Chubut Province, Argentina] (Thesis) (in Spanish). Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. hdl:20.500.12110/tesis_n1975_Cortes.
Ibiricu, Lucio M.; Casal, Gabriel A.; Alvarez, Bruno N.; De Sosa Tomas, Andrea; Lamanna, Matthew C.; Cruzado-Caballero, Penelope (October 2021). "New hadrosaurid (Dinosauria: Ornithopoda) fossils from the uppermost Cretaceous of central Patagonia and the influence of paleoenvironment on South American hadrosaur distribution". Journal of South American Earth Sciences. 110 103369. Bibcode:2021JSAES.11003369I. doi:10.1016/j.jsames.2021.103369.
Vallati, Patricia; De Sosa Tomas, Andrea; Casal, Gabriel (January 2020). "A Maastrichtian terrestrial palaeoenvironment close to the K/Pg boundary in the Golfo San Jorge basin, Patagonia, Argentina". Journal of South American Earth Sciences. 97 102401. Bibcode:2020JSAES..9702401V. doi:10.1016/j.jsames.2019.102401.
