Paleoenvironmental framework of dinosaur tracksites and other ichnofossils in Early Cretaceous mixed siliciclastic-carbonate deposits in the Neuquén Basin, northern Patagonia (Argentina)

The study of the uppermost section of the Early Cretaceous Agrio Formation in northern Patagonia (Neuquén Basin) where dinosaur tracks assigned to cf. Therangospodus pandemicus are exposed (tracksites I and II) evidence mixed marginal marine siliciclastic-carbonate deposits. The succession was divid...

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Autores principales:	Pazos, Pablo Jose, Lazo, Dario Gustavo, Tunik, Maísa Andrea, Marsicano, Claudia Alicia, Fernandez, Diana Elizabeth, Aguirre-Urreta, Maria Beatriz
Publicado:	2012
Materias:	Argentina Carbonates Cretaceous Dinosaur tracks Neuquén Basin Patagonia Tidal cycles
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_1342937X_v22_n3-4_p1125_Pazos http://hdl.handle.net/20.500.12110/paper_1342937X_v22_n3-4_p1125_Pazos
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_1342937X_v22_n3-4_p1125_Pazos
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spelling	paper:paper_1342937X_v22_n3-4_p1125_Pazos2023-06-08T16:10:31Z Paleoenvironmental framework of dinosaur tracksites and other ichnofossils in Early Cretaceous mixed siliciclastic-carbonate deposits in the Neuquén Basin, northern Patagonia (Argentina) Pazos, Pablo Jose Lazo, Dario Gustavo Tunik, Maísa Andrea Marsicano, Claudia Alicia Fernandez, Diana Elizabeth Aguirre-Urreta, Maria Beatriz Argentina Carbonates Cretaceous Dinosaur tracks Neuquén Basin Patagonia Tidal cycles The study of the uppermost section of the Early Cretaceous Agrio Formation in northern Patagonia (Neuquén Basin) where dinosaur tracks assigned to cf. Therangospodus pandemicus are exposed (tracksites I and II) evidence mixed marginal marine siliciclastic-carbonate deposits. The succession was divided in two intervals. A lower one containing theropod tracks, recorded on top of subtidal oolithic limestones with tiny wave ripples suggesting shoreline fluctuations and subaerial exposure. Tidal influence is recognised by fining upward and prograding cycles starting with subtidal carbonates and ending with fine-grained siliciclastic deposits at the top, or rarely laminites. Dolomitization affects subtidal deposits generated in an alkaline media stressful for tracemakers. Intertidal facies include abundant heterolithic deposits, coquinas composed of gastropods encrusted by multilayered bryozoans and muddy levels with incipient mud cracking. Invertebrate ichnofossils recognized from tidally dominated deposits include Arenicolites, Kouphichnium, and Rhizocorallium. The upper interval is a transgressive-regressive cycle that starts with dark shales, deficiently oxygenated, and covered by prograding sandstones and finally sand flat deposits. This interval contains Gyrochorte, Hillichnus, and Ophiomorpha documented in wave-influenced sandstones. Dinosaur tracks as well as Hillichnus, attributed to tellinoid bivalves, and Kouphichnium assigned to xiphosurans, imply the activity of producers rarely recorded previously as body fossils in marginal marine deposits of southern South America. Previous paleogeographic schemes are questioned by our analysis, which shows evidence of extremely shallow and tide-controlled sedimentation, sometimes with subaerial exposure, with high cyclicity related to a marginal marine depositional setting and lack of significant erosion by the overlying unit, as traditionally was suggested. © 2012 International Association for Gondwana Research. Fil:Pazos, P.J. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Lazo, D.G. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Tunik, M.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Marsicano, C.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Fernández, D.E. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Aguirre-Urreta, M.B. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2012 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_1342937X_v22_n3-4_p1125_Pazos http://hdl.handle.net/20.500.12110/paper_1342937X_v22_n3-4_p1125_Pazos
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Argentina Carbonates Cretaceous Dinosaur tracks Neuquén Basin Patagonia Tidal cycles
spellingShingle	Argentina Carbonates Cretaceous Dinosaur tracks Neuquén Basin Patagonia Tidal cycles Pazos, Pablo Jose Lazo, Dario Gustavo Tunik, Maísa Andrea Marsicano, Claudia Alicia Fernandez, Diana Elizabeth Aguirre-Urreta, Maria Beatriz Paleoenvironmental framework of dinosaur tracksites and other ichnofossils in Early Cretaceous mixed siliciclastic-carbonate deposits in the Neuquén Basin, northern Patagonia (Argentina)
topic_facet	Argentina Carbonates Cretaceous Dinosaur tracks Neuquén Basin Patagonia Tidal cycles
description	The study of the uppermost section of the Early Cretaceous Agrio Formation in northern Patagonia (Neuquén Basin) where dinosaur tracks assigned to cf. Therangospodus pandemicus are exposed (tracksites I and II) evidence mixed marginal marine siliciclastic-carbonate deposits. The succession was divided in two intervals. A lower one containing theropod tracks, recorded on top of subtidal oolithic limestones with tiny wave ripples suggesting shoreline fluctuations and subaerial exposure. Tidal influence is recognised by fining upward and prograding cycles starting with subtidal carbonates and ending with fine-grained siliciclastic deposits at the top, or rarely laminites. Dolomitization affects subtidal deposits generated in an alkaline media stressful for tracemakers. Intertidal facies include abundant heterolithic deposits, coquinas composed of gastropods encrusted by multilayered bryozoans and muddy levels with incipient mud cracking. Invertebrate ichnofossils recognized from tidally dominated deposits include Arenicolites, Kouphichnium, and Rhizocorallium. The upper interval is a transgressive-regressive cycle that starts with dark shales, deficiently oxygenated, and covered by prograding sandstones and finally sand flat deposits. This interval contains Gyrochorte, Hillichnus, and Ophiomorpha documented in wave-influenced sandstones. Dinosaur tracks as well as Hillichnus, attributed to tellinoid bivalves, and Kouphichnium assigned to xiphosurans, imply the activity of producers rarely recorded previously as body fossils in marginal marine deposits of southern South America. Previous paleogeographic schemes are questioned by our analysis, which shows evidence of extremely shallow and tide-controlled sedimentation, sometimes with subaerial exposure, with high cyclicity related to a marginal marine depositional setting and lack of significant erosion by the overlying unit, as traditionally was suggested. © 2012 International Association for Gondwana Research.
author	Pazos, Pablo Jose Lazo, Dario Gustavo Tunik, Maísa Andrea Marsicano, Claudia Alicia Fernandez, Diana Elizabeth Aguirre-Urreta, Maria Beatriz
author_facet	Pazos, Pablo Jose Lazo, Dario Gustavo Tunik, Maísa Andrea Marsicano, Claudia Alicia Fernandez, Diana Elizabeth Aguirre-Urreta, Maria Beatriz
author_sort	Pazos, Pablo Jose
title	Paleoenvironmental framework of dinosaur tracksites and other ichnofossils in Early Cretaceous mixed siliciclastic-carbonate deposits in the Neuquén Basin, northern Patagonia (Argentina)
title_short	Paleoenvironmental framework of dinosaur tracksites and other ichnofossils in Early Cretaceous mixed siliciclastic-carbonate deposits in the Neuquén Basin, northern Patagonia (Argentina)
title_full	Paleoenvironmental framework of dinosaur tracksites and other ichnofossils in Early Cretaceous mixed siliciclastic-carbonate deposits in the Neuquén Basin, northern Patagonia (Argentina)
title_fullStr	Paleoenvironmental framework of dinosaur tracksites and other ichnofossils in Early Cretaceous mixed siliciclastic-carbonate deposits in the Neuquén Basin, northern Patagonia (Argentina)
title_full_unstemmed	Paleoenvironmental framework of dinosaur tracksites and other ichnofossils in Early Cretaceous mixed siliciclastic-carbonate deposits in the Neuquén Basin, northern Patagonia (Argentina)
title_sort	paleoenvironmental framework of dinosaur tracksites and other ichnofossils in early cretaceous mixed siliciclastic-carbonate deposits in the neuquén basin, northern patagonia (argentina)
publishDate	2012
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_1342937X_v22_n3-4_p1125_Pazos http://hdl.handle.net/20.500.12110/paper_1342937X_v22_n3-4_p1125_Pazos
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Paleoenvironmental framework of dinosaur tracksites and other ichnofossils in Early Cretaceous mixed siliciclastic-carbonate deposits in the Neuquén Basin, northern Patagonia (Argentina)

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