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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.


Documento: Artículo
Título:Triassic ichnofaunas in distal alluvial fans: Evidence from the Cerro Puntudo formation, Cuyo Basin, Argentina
Autor:Krapovickas, V.; Mángano, M.G.; Mancuso, A.; Marsicano, C.A.; Volkheimer, W.
Filiación:Consejo Nacional de Investigaciones Científicas y Técnicas, Museo Municipal Carmen Funes, Av. Córdoba 55, 8318 Plaza Huincul, Neuquén, Argentina
Department of Geological Sciences, University of Saskatchewan, Saskatoon, SK S7N 5E2, Canada
Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales, Ctro. Reg. de Invest. Cie. y Tecnologicas-Consejo Nacional de Investigaciones Cientificas y Tecnicas, Parque Gral. San Martín, Adrián Ruiz Leal s/n, 5500 Mendoza, CC 330, Argentina
Consejo Nacional de Investigaciones Científicas y Técnicas, Laboratorio de Paleontología de Vertebrados, Ciudad Universitaria, 1428 Buenos Aires, Argentina
Palabras clave: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
Página de inicio:463
Página de fin:472
Título revista:Ameghiniana
Título revista abreviado:Ameghiniana


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---------- APA ----------
Krapovickas, V., Mángano, M.G., Mancuso, A., Marsicano, C.A. & Volkheimer, W. (2008) . Triassic ichnofaunas in distal alluvial fans: Evidence from the Cerro Puntudo formation, Cuyo Basin, Argentina . Ameghiniana, 45(2), 463-472.
Recuperado de [ ]
---------- CHICAGO ----------
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 " . Ameghiniana 45, no. 2 (2008) : 463-472.
Recuperado de [ ]
---------- MLA ----------
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 " . Ameghiniana, vol. 45, no. 2, 2008, pp. 463-472.
Recuperado de [ ]
---------- VANCOUVER ----------
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 . Ameghiniana. 2008;45(2):463-472.
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