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| Neuquén Group | |
|---|---|
| Name | Neuquén Group |
| Period | Late Cretaceous |
| Type | Geological group |
| Subunits | Agrio Formation, Huitrín Formation, Los Molles Formation, Lajas Formation, Puesto Agneta Formation, Río Limay Subgroup, Río Neuquén Subgroup, Río Colorado Subgroup |
| Region | Neuquén Province, Mendoza Province, La Pampa Province, Río Negro Province, Argentina |
Neuquén Group The Neuquén Group is a stratigraphic succession of Late Cretaceous continental and marginal marine deposits exposed in Neuquén Basin of Argentina; it preserves key records of South American paleontology, petroleum systems, tectonics, and paleoclimate during the Cretaceous. The succession includes clastic, volcanic and carbonate units that yield diverse fossils, and has been the focus of research by institutions such as CONICET, Museo Argentino de Ciencias Naturales Bernardino Rivadavia, Museo de La Plata, University of Buenos Aires and international teams from Smithsonian Institution, Natural History Museum, London and American Museum of Natural History. The Neuquén Group underpins exploration by energy companies including YPF, Petrobras, ExxonMobil, Chevron Corporation and TotalEnergies.
The Neuquén Group rests on older Paleozoic and Jurassic strata of the Ventana System and overlies the Loncoche Formation and Malargüe Group in parts of the Neuquén Basin. Its lithostratigraphy comprises fluvial, deltaic, lacustrine and shallow marine sequences subdivided into subgroups and formations—such as the Río Limay Subgroup and Río Neuquén Subgroup—mapped by researchers from Servicio Geológico Minero Argentino and described in regional syntheses by geologists at Universidad Nacional del Comahue and Universidad Nacional del Sur. Chronostratigraphic correlations tie the group to the Cenomanian, Turonian, Coniacian, Santonian and Campanian stages, using ammonite biostratigraphy linked to the Tethyan Province and magnetostratigraphy calibrated with global polarity timescales developed by teams at University of Cambridge and University of Oxford. Structural control by Andean inversion associated with the Andean orogeny influenced accommodation and sandstone bodies, as modeled in basin analyses by Harvard University and MIT researchers. Sediment provenance studies implicate the Patagonian Massif, Famatina Belt and recycled sources tied to erosion documented by US Geological Survey-style detrital zircon U-Pb geochronology conducted at Arizona State University and Stanford University.
Paleoenvironmental reconstructions combine facies analysis from field teams at Universidad Nacional de Córdoba and facies models used in textbooks from Cambridge University Press; they interpret braided to meandering fluvial systems, coastal plains, deltaic lobes, ephemeral lakes and tide-influenced shorelines. Volcaniclastic input related to Patagonian volcanism and regional ash beds yield radiometric ages from laboratories at Los Alamos National Laboratory and Max Planck Institute for Chemistry, constraining depositional rates. Paleosol horizons correlated with global greenhouse intervals recorded in isotope studies by Scripps Institution of Oceanography indicate climatic variability during the Cretaceous Thermal Maximum. Sequence stratigraphy applied by consultants from Schlumberger and Halliburton links major unconformities to eustatic sea-level changes recognized in the Western Interior Seaway and by work at University of Texas at Austin.
The Neuquén Group has produced abundant vertebrate and invertebrate fossils collected by expeditions from Field Museum of Natural History, Museo Paleontológico Ernesto Bachmann, Museo Municipal Carmen Funes and Museo Argentino Urquiza. Marine invertebrates such as ammonites and bivalves correlate with faunas from Europe and Africa, while terrestrial assemblages include diverse dinosaurs, crocodyliforms, turtles, lizards, mammals and birds studied by paleontologists at University of Chicago and University of Zaragoza. Plant fossils and palynological samples tied to work at Royal Botanic Gardens, Kew and University of Leeds inform regional vegetation patterns. Trace fossils—tracks and burrows—have been documented in collaboration with the International Union of Geological Sciences ichnology groups and published alongside research from University of Sao Paulo.
Notable dinosaurs described from the Neuquén Basin include abelisaurids, noasaurids, megaraptorans, unenlagiines and titanosaurs, with type specimens curated at Museo Carmen Funes and Museo Argentino de Ciencias Naturales. Key taxa studied in monographs by teams at Universidad Nacional de Río Negro and Museo Paleontológico Egidio Feruglio include genera that have been compared with forms from Gondwana, Madagascar, India and Antarctica in papers coauthored with researchers from University of Cambridge and Monash University. Crocodyliform taxa link to work by specialists at University of Bonn and Universidad de Buenos Aires; chelid turtles and meiolaniid-like forms were documented by teams from Museo de La Plata and Australian Museum. Small vertebrates—mammaliaforms and multituberculates—were recovered in screen-wash programs collaborated with paleontologists from National Museum of Natural History, Paris and University of Alberta.
The Neuquén Group hosts unconventional and conventional hydrocarbon plays evaluated by YPF in partnership with ExxonMobil and service firms including Schlumberger; source-rock intervals in organic-rich shales have been characterized by organic geochemistry labs at University of Calgary and Imperial College London. Reservoir sandstone bodies inform field development plans for blocks licensed to TotalEnergies and Petrobras. Mineral occurrences such as phosphate and bentonite were assessed by Servicio Geológico Minero Argentino and mining studies at Universidad Nacional de San Juan. Groundwater exploitation in Quaternary and Neogene cover derived from weathered Neuquén Group units has been managed by provincial water authorities in Neuquén Province and Mendoza Province.
Early descriptions of sections in the Neuquén Basin were made by 19th- and early 20th-century geologists associated with Franciscan Order-linked surveys and national geological surveys comparable to those founded by Alexander von Humboldt; systematic stratigraphic work accelerated with Argentine teams at Museo de La Plata and institutions like Universidad de Buenos Aires during the mid-20th century. International collaborations involving Royal Society grant-funded expeditions and NATO science programs expanded biostratigraphic and paleontological knowledge; naming and formalization of formations followed frameworks championed by the International Commission on Stratigraphy and regional lexicons maintained by Servicio Geológico Minero Argentino. Recent revisions incorporating radiometric dates, magnetostratigraphy and refined biostratigraphy have been published in journals affiliated with Geological Society of America, Palaeontology and Journal of South American Earth Sciences by multidisciplinary teams from CONICET, Universidad Nacional del Comahue and partner universities worldwide.
Category:Geologic formations of Argentina