Sedimentology and palaeontology of Los Colorados formation. Upper triassic (La Rioja and San Juan provinces, Argentina)

A sedimentological and palaeontological analysis of Los Colorados Formation sequence was undertaken in order to interpret the depositional environment and palaeoclimatic conditions. The sequence, characterised by sandstone and mudstone, was deposited by moderately sinuous fluvial systems, and interf...

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Detalles Bibliográficos
Autores principales: Caselli, A.T., Marsicano, C.A., Arcucci, A.B.
Formato: JOUR
Materias:
Ischigualasto-Villa unión Basin
Los Colorados formation
Palaeontology
Sedimentology
Upper Triassic
biostratigraphy
paleoclimate
paleoenvironment
paleontology
sedimentology
Triassic
Argentina
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00044822_v56_n2_p173_Caselli
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_00044822_v56_n2_p173_Caselli
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spelling todo:paper_00044822_v56_n2_p173_Caselli2023-10-03T13:57:36Z Sedimentology and palaeontology of Los Colorados formation. Upper triassic (La Rioja and San Juan provinces, Argentina) Caselli, A.T. Marsicano, C.A. Arcucci, A.B. Ischigualasto-Villa unión Basin Los Colorados formation Palaeontology Sedimentology Upper Triassic biostratigraphy paleoclimate paleoenvironment paleontology sedimentology Triassic Argentina A sedimentological and palaeontological analysis of Los Colorados Formation sequence was undertaken in order to interpret the depositional environment and palaeoclimatic conditions. The sequence, characterised by sandstone and mudstone, was deposited by moderately sinuous fluvial systems, and interfingers laterally with and grades into horizontally bedded flood-plain deposits. Towards the top of the sequence, thin-bedded fossil-bearing sandstones and mudstones were deposited in ponds and as crevasse splays in overbank settings. The high abundance of large herbivorous tetrapods (prosauropods), medium- to large-sized browsers with derived masticatory apparatus (dicynodonts), and medium-sized, probably herbivorous, amphibious forms (aetosaurs), together with the sedimentological features of the unit, suggest that the climatic conditions in the area during the Late Triassic were wetter than previously suggested. The lack of a vegetation record in Los Colorados Formation is interpreted as a taphonomic problem related to the oxidizing conditions during deposition. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00044822_v56_n2_p173_Caselli
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Ischigualasto-Villa unión Basin
Los Colorados formation
Palaeontology
Sedimentology
Upper Triassic
biostratigraphy
paleoclimate
paleoenvironment
paleontology
sedimentology
Triassic
Argentina
spellingShingle Ischigualasto-Villa unión Basin
Los Colorados formation
Palaeontology
Sedimentology
Upper Triassic
biostratigraphy
paleoclimate
paleoenvironment
paleontology
sedimentology
Triassic
Argentina
Caselli, A.T.
Marsicano, C.A.
Arcucci, A.B.
Sedimentology and palaeontology of Los Colorados formation. Upper triassic (La Rioja and San Juan provinces, Argentina)
topic_facet Ischigualasto-Villa unión Basin
Los Colorados formation
Palaeontology
Sedimentology
Upper Triassic
biostratigraphy
paleoclimate
paleoenvironment
paleontology
sedimentology
Triassic
Argentina
description A sedimentological and palaeontological analysis of Los Colorados Formation sequence was undertaken in order to interpret the depositional environment and palaeoclimatic conditions. The sequence, characterised by sandstone and mudstone, was deposited by moderately sinuous fluvial systems, and interfingers laterally with and grades into horizontally bedded flood-plain deposits. Towards the top of the sequence, thin-bedded fossil-bearing sandstones and mudstones were deposited in ponds and as crevasse splays in overbank settings. The high abundance of large herbivorous tetrapods (prosauropods), medium- to large-sized browsers with derived masticatory apparatus (dicynodonts), and medium-sized, probably herbivorous, amphibious forms (aetosaurs), together with the sedimentological features of the unit, suggest that the climatic conditions in the area during the Late Triassic were wetter than previously suggested. The lack of a vegetation record in Los Colorados Formation is interpreted as a taphonomic problem related to the oxidizing conditions during deposition.
format JOUR
author Caselli, A.T.
Marsicano, C.A.
Arcucci, A.B.
author_facet Caselli, A.T.
Marsicano, C.A.
Arcucci, A.B.
author_sort Caselli, A.T.
title Sedimentology and palaeontology of Los Colorados formation. Upper triassic (La Rioja and San Juan provinces, Argentina)
title_short Sedimentology and palaeontology of Los Colorados formation. Upper triassic (La Rioja and San Juan provinces, Argentina)
title_full Sedimentology and palaeontology of Los Colorados formation. Upper triassic (La Rioja and San Juan provinces, Argentina)
title_fullStr Sedimentology and palaeontology of Los Colorados formation. Upper triassic (La Rioja and San Juan provinces, Argentina)
title_full_unstemmed Sedimentology and palaeontology of Los Colorados formation. Upper triassic (La Rioja and San Juan provinces, Argentina)
title_sort sedimentology and palaeontology of los colorados formation. upper triassic (la rioja and san juan provinces, argentina)
url http://hdl.handle.net/20.500.12110/paper_00044822_v56_n2_p173_Caselli
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AT marsicanoca sedimentologyandpalaeontologyofloscoloradosformationuppertriassiclariojaandsanjuanprovincesargentina
AT arcucciab sedimentologyandpalaeontologyofloscoloradosformationuppertriassiclariojaandsanjuanprovincesargentina
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