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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2008
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00027014_v45_n2_p463_Krapovickas http://hdl.handle.net/20.500.12110/paper_00027014_v45_n2_p463_Krapovickas |
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paper:paper_00027014_v45_n2_p463_Krapovickas2023-06-08T14:22:17Z Triassic ichnofaunas in distal alluvial fans: Evidence from the Cerro Puntudo formation, Cuyo Basin, Argentina 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. 2008 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00027014_v45_n2_p463_Krapovickas 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 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. |
| 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 |
| publishDate |
2008 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00027014_v45_n2_p463_Krapovickas http://hdl.handle.net/20.500.12110/paper_00027014_v45_n2_p463_Krapovickas |
| _version_ |
1768544936819425280 |