Triassic ichnofaunas in distal alluvial fans: Evidence from the Cerro Puntudo formation, Cuyo Basin, Argentina

Alluvial fan deposits of the Cerro Puntudo Formation (Triassic, Cuyo Basin, San Juan province) contain a low-diversity ichnofauna. The analyzed section indicates sedimentation in the most distal portion of an alluvial fan system. Palaeophycus tubularis Hall, Palaeophycus striatus Hall, and small sub...

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Autores principales: Krapovickas, V., Mángano, M.G., Mancuso, A., Marsicano, C.A., Volkheimer, W.
Formato: JOUR
Materias:
Opportunistic association
Scoyenia ichnofacies
Skolithos ichnofacies
Substrate consistency
alluvial fan
biogenic deposit
channelization
dewatering
floodplain
ichthyofauna
limestone
morphology
playa
sandstone
sedimentation
substrate
trace fossil
Argentina
Cuyo Basin
South America
Palaeophycus
Palaeophycus tubularis
Scoyenia
Skolithos
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00027014_v45_n2_p463_Krapovickas
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_00027014_v45_n2_p463_Krapovickas
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spelling todo:paper_00027014_v45_n2_p463_Krapovickas2023-10-03T13:53:03Z Triassic ichnofaunas in distal alluvial fans: Evidence from the Cerro Puntudo formation, Cuyo Basin, Argentina Krapovickas, V. Mángano, M.G. Mancuso, A. Marsicano, C.A. Volkheimer, W. Opportunistic association Scoyenia ichnofacies Skolithos ichnofacies Substrate consistency alluvial fan biogenic deposit channelization dewatering floodplain ichthyofauna limestone morphology playa sandstone sedimentation substrate trace fossil Argentina Cuyo Basin South America Palaeophycus Palaeophycus tubularis Scoyenia Skolithos Alluvial fan deposits of the Cerro Puntudo Formation (Triassic, Cuyo Basin, San Juan province) contain a low-diversity ichnofauna. The analyzed section indicates sedimentation in the most distal portion of an alluvial fan system. Palaeophycus tubularis Hall, Palaeophycus striatus Hall, and small sub-horizontal and inclined trace fossils occur in laterally extensive tuffaceous limestone, interpreted as playa-lake deposits originated by flash floods. They are attributed to the Scoyenia ichnofacies. Massive and trough cross-stratified medium- and fine-grained sandstones, filling small channelized bodies, contains a monospecific association of sparse Skolithos isp. illustrating the Skolithos ichnofacies. Low diversity, moderate abundance, and the presence of simple dwelling structures suggest an opportunistic association. Based on cross-cutting relationships among biogenic structures and preservation of morphological details, an evolution from a soft tò a relatively firm substrate is proposed. Two suites have been distinguished in connection to progressive dewatering of floodplain sediments: 1) Palaeophycus tubularis Hall and small sub-horizontal and inclined trace fossils, developed in a soft substrate, and 2) Palaeophycus striatus Hall associated with small sub-horizontal and inclined trace fossils, developed in a relatively firm substrate. © Asociación Paleontológica Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00027014_v45_n2_p463_Krapovickas
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Opportunistic association
Scoyenia ichnofacies
Skolithos ichnofacies
Substrate consistency
alluvial fan
biogenic deposit
channelization
dewatering
floodplain
ichthyofauna
limestone
morphology
playa
sandstone
sedimentation
substrate
trace fossil
Argentina
Cuyo Basin
South America
Palaeophycus
Palaeophycus tubularis
Scoyenia
Skolithos
spellingShingle Opportunistic association
Scoyenia ichnofacies
Skolithos ichnofacies
Substrate consistency
alluvial fan
biogenic deposit
channelization
dewatering
floodplain
ichthyofauna
limestone
morphology
playa
sandstone
sedimentation
substrate
trace fossil
Argentina
Cuyo Basin
South America
Palaeophycus
Palaeophycus tubularis
Scoyenia
Skolithos
Krapovickas, V.
Mángano, M.G.
Mancuso, A.
Marsicano, C.A.
Volkheimer, W.
Triassic ichnofaunas in distal alluvial fans: Evidence from the Cerro Puntudo formation, Cuyo Basin, Argentina
topic_facet Opportunistic association
Scoyenia ichnofacies
Skolithos ichnofacies
Substrate consistency
alluvial fan
biogenic deposit
channelization
dewatering
floodplain
ichthyofauna
limestone
morphology
playa
sandstone
sedimentation
substrate
trace fossil
Argentina
Cuyo Basin
South America
Palaeophycus
Palaeophycus tubularis
Scoyenia
Skolithos
description Alluvial fan deposits of the Cerro Puntudo Formation (Triassic, Cuyo Basin, San Juan province) contain a low-diversity ichnofauna. The analyzed section indicates sedimentation in the most distal portion of an alluvial fan system. Palaeophycus tubularis Hall, Palaeophycus striatus Hall, and small sub-horizontal and inclined trace fossils occur in laterally extensive tuffaceous limestone, interpreted as playa-lake deposits originated by flash floods. They are attributed to the Scoyenia ichnofacies. Massive and trough cross-stratified medium- and fine-grained sandstones, filling small channelized bodies, contains a monospecific association of sparse Skolithos isp. illustrating the Skolithos ichnofacies. Low diversity, moderate abundance, and the presence of simple dwelling structures suggest an opportunistic association. Based on cross-cutting relationships among biogenic structures and preservation of morphological details, an evolution from a soft tò a relatively firm substrate is proposed. Two suites have been distinguished in connection to progressive dewatering of floodplain sediments: 1) Palaeophycus tubularis Hall and small sub-horizontal and inclined trace fossils, developed in a soft substrate, and 2) Palaeophycus striatus Hall associated with small sub-horizontal and inclined trace fossils, developed in a relatively firm substrate. © Asociación Paleontológica Argentina.
format JOUR
author Krapovickas, V.
Mángano, M.G.
Mancuso, A.
Marsicano, C.A.
Volkheimer, W.
author_facet Krapovickas, V.
Mángano, M.G.
Mancuso, A.
Marsicano, C.A.
Volkheimer, W.
author_sort Krapovickas, V.
title Triassic ichnofaunas in distal alluvial fans: Evidence from the Cerro Puntudo formation, Cuyo Basin, Argentina
title_short Triassic ichnofaunas in distal alluvial fans: Evidence from the Cerro Puntudo formation, Cuyo Basin, Argentina
title_full Triassic ichnofaunas in distal alluvial fans: Evidence from the Cerro Puntudo formation, Cuyo Basin, Argentina
title_fullStr Triassic ichnofaunas in distal alluvial fans: Evidence from the Cerro Puntudo formation, Cuyo Basin, Argentina
title_full_unstemmed Triassic ichnofaunas in distal alluvial fans: Evidence from the Cerro Puntudo formation, Cuyo Basin, Argentina
title_sort triassic ichnofaunas in distal alluvial fans: evidence from the cerro puntudo formation, cuyo basin, argentina
url http://hdl.handle.net/20.500.12110/paper_00027014_v45_n2_p463_Krapovickas
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AT manganomg triassicichnofaunasindistalalluvialfansevidencefromthecerropuntudoformationcuyobasinargentina
AT mancusoa triassicichnofaunasindistalalluvialfansevidencefromthecerropuntudoformationcuyobasinargentina
AT marsicanoca triassicichnofaunasindistalalluvialfansevidencefromthecerropuntudoformationcuyobasinargentina
AT volkheimerw triassicichnofaunasindistalalluvialfansevidencefromthecerropuntudoformationcuyobasinargentina
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