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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Autores principales: Bressan, Graciela Susana, Palma, Ricardo Manuel
Publicado: 2009
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Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00015709_v59_n2_p201_Bressan
http://hdl.handle.net/20.500.12110/paper_00015709_v59_n2_p201_Bressan
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spelling paper:paper_00015709_v59_n2_p201_Bressan2023-06-08T14:20:54Z Trace fossils from the Lower-Middle Jurassic Bardas Blancas Formation, Neuquén Basin, Mendoza Province, Argentina Bressan, Graciela Susana Palma, Ricardo Manuel 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. 2009 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00015709_v59_n2_p201_Bressan 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, Graciela Susana
Palma, Ricardo Manuel
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.
author Bressan, Graciela Susana
Palma, Ricardo Manuel
author_facet Bressan, Graciela Susana
Palma, Ricardo Manuel
author_sort Bressan, Graciela Susana
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
publishDate 2009
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00015709_v59_n2_p201_Bressan
http://hdl.handle.net/20.500.12110/paper_00015709_v59_n2_p201_Bressan
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