Trace fossils from the Lower-Middle Jurassic Bardas Blancas Formation, Neuquén Basin, Mendoza Province, Argentina
Trace fossil associations from the Lower-Middle Jurassic siliciclastic succession of the northern Neuquén Basin, Argentina are described and their palaeoenvironmental interpretation is discussed. The Bardas Blancas Formation displays facies of lower foreshore to offshore environments, such as massiv...
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todo:paper_00015709_v59_n2_p201_Bressan2023-10-03T13:51:20Z Trace fossils from the Lower-Middle Jurassic Bardas Blancas Formation, Neuquén Basin, Mendoza Province, Argentina Bressan, G.S. Palma, R.M. Argentina Ichnofacies Ichnotaxonomy Jurassic N Basin Neuqué Trace fossils facies analysis fossil assemblage ichnofacies Jurassic paleoenvironment sandstone siliciclastic deposit taxonomy trace fossil Argentina Mendoza Neuquen Basin South America Arenicolites Cruziana Diplocraterion Gordia Lockeia Palaeophycus Planolites Skolithos Taenidium Thalassinoides Zoophycos Trace fossil associations from the Lower-Middle Jurassic siliciclastic succession of the northern Neuquén Basin, Argentina are described and their palaeoenvironmental interpretation is discussed. The Bardas Blancas Formation displays facies of lower foreshore to offshore environments, such as massive and laminated mudstones, laminated siltstones, hummocky cross-stratified sandstones, massive and laminated sandstones, wave-rippled sandstones, as well as fine- to medium-grained bioclastic sandstones and massive conglomerates. They contain a trace fossil assemblage low in abundance but high in diversity. The assemblage, comprising eleven ichnogenera, is dominated by Skolithos, Chondrites, Thalassinoides, Planolites, Palaeophycus, Taenidium, Gyrochorte and Arenicolites. Gordia,? Diplocraterion and Lockeia are less abundant. These trace fossils belong to the Skolithos, Cruziana and Zoophycos ichnofacies. Their distribution is controlled mainly by hydrodynamic energy, substrate consistency and oxygen levels. Storm beds exhibit two successive stages of colonization: (1) the pioneer stage, during which Skolithos, Diplocraterion and Arenicolites (elements of the Skolithos ichnofacies), were produced; and (2) the stable environment stage, represented by Chondrites, Thalassinoides, Taenidium, Gyrochorte, Gordia, Lockeia, Palaeophycus and Planolites (elements of the Cruziana ichnofacies). deeper environments exhibit a low diversity association with Chondrites and Thalassinoides, characterizing the Zoophycos ichnofacies. Fil:Bressan, G.S. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Palma, R.M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00015709_v59_n2_p201_Bressan |
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 Ichnofacies Ichnotaxonomy Jurassic N Basin Neuqué Trace fossils facies analysis fossil assemblage ichnofacies Jurassic paleoenvironment sandstone siliciclastic deposit taxonomy trace fossil Argentina Mendoza Neuquen Basin South America Arenicolites Cruziana Diplocraterion Gordia Lockeia Palaeophycus Planolites Skolithos Taenidium Thalassinoides Zoophycos |
spellingShingle |
Argentina Ichnofacies Ichnotaxonomy Jurassic N Basin Neuqué Trace fossils facies analysis fossil assemblage ichnofacies Jurassic paleoenvironment sandstone siliciclastic deposit taxonomy trace fossil Argentina Mendoza Neuquen Basin South America Arenicolites Cruziana Diplocraterion Gordia Lockeia Palaeophycus Planolites Skolithos Taenidium Thalassinoides Zoophycos Bressan, G.S. Palma, R.M. Trace fossils from the Lower-Middle Jurassic Bardas Blancas Formation, Neuquén Basin, Mendoza Province, Argentina |
topic_facet |
Argentina Ichnofacies Ichnotaxonomy Jurassic N Basin Neuqué Trace fossils facies analysis fossil assemblage ichnofacies Jurassic paleoenvironment sandstone siliciclastic deposit taxonomy trace fossil Argentina Mendoza Neuquen Basin South America Arenicolites Cruziana Diplocraterion Gordia Lockeia Palaeophycus Planolites Skolithos Taenidium Thalassinoides Zoophycos |
description |
Trace fossil associations from the Lower-Middle Jurassic siliciclastic succession of the northern Neuquén Basin, Argentina are described and their palaeoenvironmental interpretation is discussed. The Bardas Blancas Formation displays facies of lower foreshore to offshore environments, such as massive and laminated mudstones, laminated siltstones, hummocky cross-stratified sandstones, massive and laminated sandstones, wave-rippled sandstones, as well as fine- to medium-grained bioclastic sandstones and massive conglomerates. They contain a trace fossil assemblage low in abundance but high in diversity. The assemblage, comprising eleven ichnogenera, is dominated by Skolithos, Chondrites, Thalassinoides, Planolites, Palaeophycus, Taenidium, Gyrochorte and Arenicolites. Gordia,? Diplocraterion and Lockeia are less abundant. These trace fossils belong to the Skolithos, Cruziana and Zoophycos ichnofacies. Their distribution is controlled mainly by hydrodynamic energy, substrate consistency and oxygen levels. Storm beds exhibit two successive stages of colonization: (1) the pioneer stage, during which Skolithos, Diplocraterion and Arenicolites (elements of the Skolithos ichnofacies), were produced; and (2) the stable environment stage, represented by Chondrites, Thalassinoides, Taenidium, Gyrochorte, Gordia, Lockeia, Palaeophycus and Planolites (elements of the Cruziana ichnofacies). deeper environments exhibit a low diversity association with Chondrites and Thalassinoides, characterizing the Zoophycos ichnofacies. |
format |
JOUR |
author |
Bressan, G.S. Palma, R.M. |
author_facet |
Bressan, G.S. Palma, R.M. |
author_sort |
Bressan, G.S. |
title |
Trace fossils from the Lower-Middle Jurassic Bardas Blancas Formation, Neuquén Basin, Mendoza Province, Argentina |
title_short |
Trace fossils from the Lower-Middle Jurassic Bardas Blancas Formation, Neuquén Basin, Mendoza Province, Argentina |
title_full |
Trace fossils from the Lower-Middle Jurassic Bardas Blancas Formation, Neuquén Basin, Mendoza Province, Argentina |
title_fullStr |
Trace fossils from the Lower-Middle Jurassic Bardas Blancas Formation, Neuquén Basin, Mendoza Province, Argentina |
title_full_unstemmed |
Trace fossils from the Lower-Middle Jurassic Bardas Blancas Formation, Neuquén Basin, Mendoza Province, Argentina |
title_sort |
trace fossils from the lower-middle jurassic bardas blancas formation, neuquén basin, mendoza province, argentina |
url |
http://hdl.handle.net/20.500.12110/paper_00015709_v59_n2_p201_Bressan |
work_keys_str_mv |
AT bressangs tracefossilsfromthelowermiddlejurassicbardasblancasformationneuquenbasinmendozaprovinceargentina AT palmarm tracefossilsfromthelowermiddlejurassicbardasblancasformationneuquenbasinmendozaprovinceargentina |
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