The Triassic/Jurassic boundary in the Andes of Argentina

The Arroyo Malo Formation at Alumbre Creek, on the northern bank of the Atuel River, west central Argentina, comprises a c. 300 m thick continuous marine succession across the Triassic-Jurassic System boundary, consisting of massive and laminated pelites indicative of a slope depositional environmen...

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Detalles Bibliográficos
Autores principales:	Riccardi, A.C., Damborenea, S.E., Mancenido, M.O., Iglesia Llanos, M.P.
Formato:	JOUR
Materias:	Ammonoids Argentina Biostratigraphy Bivalves Brachiopods Triassic/Jurassic boundary biostratigraphy boundary Jurassic stratigraphic correlation Triassic Andes South America Ammonoidea Anthozoa Bivalvia Brachiopoda Choristoceras Foraminifera Gastropoda Invertebrata Nautilida Nautiloidea Ostracoda Planorbis Radiolaria (protozoans)
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_00356883_v110_n1_p69_Riccardi
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

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spelling	todo:paper_00356883_v110_n1_p69_Riccardi2023-10-03T14:46:38Z The Triassic/Jurassic boundary in the Andes of Argentina Riccardi, A.C. Damborenea, S.E. Mancenido, M.O. Iglesia Llanos, M.P. Ammonoids Argentina Biostratigraphy Bivalves Brachiopods Triassic/Jurassic boundary biostratigraphy boundary Jurassic stratigraphic correlation Triassic Andes Argentina South America Ammonoidea Anthozoa Bivalvia Brachiopoda Choristoceras Foraminifera Gastropoda Invertebrata Nautilida Nautiloidea Ostracoda Planorbis Radiolaria (protozoans) The Arroyo Malo Formation at Alumbre Creek, on the northern bank of the Atuel River, west central Argentina, comprises a c. 300 m thick continuous marine succession across the Triassic-Jurassic System boundary, consisting of massive and laminated pelites indicative of a slope depositional environment. Late Triassic invertebrates, including ammonoids, nautiloids, bivalves, gastropods, brachiopods and corals are restricted to the lower 150 m. Beds between 125-135 m from the bottom yield Choristoceras cf. marshi Hauer, a species found in the Marshi/Crickmayi Zone of Europe and North America, together with loose fragments of Psiloceras cf. pressum Hillebrandt, coeval with the lower to middle part of the Hettangian Planorbis Zone. About 80 m higher are beds yielding Psiloceras cf. rectocostatum Hillebrandt, a species that gives name to an Andean biozone partially coeval with the Johnstoni and Plicatulum Subzones, upper Planorbis Zone. Other fossils recorded in the Rhaetian strata of this section are foraminifers, ostracods and plant remains identified as Zuberia cf. zuberi (Szaj.) Freng. and Clathropteris sp. The section was also sampled for conodonts and radiolarians, thus far with negative results. A palaeomagnetic study is underway. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00356883_v110_n1_p69_Riccardi
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Ammonoids Argentina Biostratigraphy Bivalves Brachiopods Triassic/Jurassic boundary biostratigraphy boundary Jurassic stratigraphic correlation Triassic Andes Argentina South America Ammonoidea Anthozoa Bivalvia Brachiopoda Choristoceras Foraminifera Gastropoda Invertebrata Nautilida Nautiloidea Ostracoda Planorbis Radiolaria (protozoans)
spellingShingle	Ammonoids Argentina Biostratigraphy Bivalves Brachiopods Triassic/Jurassic boundary biostratigraphy boundary Jurassic stratigraphic correlation Triassic Andes Argentina South America Ammonoidea Anthozoa Bivalvia Brachiopoda Choristoceras Foraminifera Gastropoda Invertebrata Nautilida Nautiloidea Ostracoda Planorbis Radiolaria (protozoans) Riccardi, A.C. Damborenea, S.E. Mancenido, M.O. Iglesia Llanos, M.P. The Triassic/Jurassic boundary in the Andes of Argentina
topic_facet	Ammonoids Argentina Biostratigraphy Bivalves Brachiopods Triassic/Jurassic boundary biostratigraphy boundary Jurassic stratigraphic correlation Triassic Andes Argentina South America Ammonoidea Anthozoa Bivalvia Brachiopoda Choristoceras Foraminifera Gastropoda Invertebrata Nautilida Nautiloidea Ostracoda Planorbis Radiolaria (protozoans)
description	The Arroyo Malo Formation at Alumbre Creek, on the northern bank of the Atuel River, west central Argentina, comprises a c. 300 m thick continuous marine succession across the Triassic-Jurassic System boundary, consisting of massive and laminated pelites indicative of a slope depositional environment. Late Triassic invertebrates, including ammonoids, nautiloids, bivalves, gastropods, brachiopods and corals are restricted to the lower 150 m. Beds between 125-135 m from the bottom yield Choristoceras cf. marshi Hauer, a species found in the Marshi/Crickmayi Zone of Europe and North America, together with loose fragments of Psiloceras cf. pressum Hillebrandt, coeval with the lower to middle part of the Hettangian Planorbis Zone. About 80 m higher are beds yielding Psiloceras cf. rectocostatum Hillebrandt, a species that gives name to an Andean biozone partially coeval with the Johnstoni and Plicatulum Subzones, upper Planorbis Zone. Other fossils recorded in the Rhaetian strata of this section are foraminifers, ostracods and plant remains identified as Zuberia cf. zuberi (Szaj.) Freng. and Clathropteris sp. The section was also sampled for conodonts and radiolarians, thus far with negative results. A palaeomagnetic study is underway.
format	JOUR
author	Riccardi, A.C. Damborenea, S.E. Mancenido, M.O. Iglesia Llanos, M.P.
author_facet	Riccardi, A.C. Damborenea, S.E. Mancenido, M.O. Iglesia Llanos, M.P.
author_sort	Riccardi, A.C.
title	The Triassic/Jurassic boundary in the Andes of Argentina
title_short	The Triassic/Jurassic boundary in the Andes of Argentina
title_full	The Triassic/Jurassic boundary in the Andes of Argentina
title_fullStr	The Triassic/Jurassic boundary in the Andes of Argentina
title_full_unstemmed	The Triassic/Jurassic boundary in the Andes of Argentina
title_sort	triassic/jurassic boundary in the andes of argentina
url	http://hdl.handle.net/20.500.12110/paper_00356883_v110_n1_p69_Riccardi
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The Triassic/Jurassic boundary in the Andes of Argentina

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