Graptolite-trilobite biostratigraphy in the Santa Victoria area, northwestern Argentina. A key for regional and worldwide correlation of the Lower Ordovician (Tremadocian-Floian)

New graptolite-trilobite records provide relevant information for the biostratigraphic framework of the lower Paleozoic in western Gondwana. Aorograptus victoriae (T. S. Hall), together with Adelogratus cf. A. altus Williams and Stevens and Ancoragraptus bulmani (Spjeldnaes) are described for the fi...

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Autores principales:	Toro, B.A., Arcerito, F.R.M., Muñoz, D.F., Waisfeld, B.G., De La Puente, G.S.
Formato:	JOUR
Materias:	Floian Graptolites Northwestern Argentina Tremadocian Trilobites Western Gondwana biostratigraphy biozonation Gondwana Ordovician palynomorph population distribution succession trilobite age structure graptolite resolution Argentina Bolivia Scandinavia Cordillera Oriental [Argentina] Aorograptus victoriae Chitinozoa Rosita Trilobitomorpha
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_00027014_v52_n5_p535_Toro
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

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spelling	todo:paper_00027014_v52_n5_p535_Toro2023-10-03T13:53:18Z Graptolite-trilobite biostratigraphy in the Santa Victoria area, northwestern Argentina. A key for regional and worldwide correlation of the Lower Ordovician (Tremadocian-Floian) Toro, B.A. Arcerito, F.R.M. Muñoz, D.F. Waisfeld, B.G. De La Puente, G.S. Floian Graptolites Northwestern Argentina Tremadocian Trilobites Western Gondwana biostratigraphy biozonation Gondwana Ordovician palynomorph population distribution succession trilobite age structure graptolite resolution Tremadocian Argentina Bolivia Scandinavia Cordillera Oriental [Argentina] Aorograptus victoriae Chitinozoa Rosita Trilobitomorpha New graptolite-trilobite records provide relevant information for the biostratigraphic framework of the lower Paleozoic in western Gondwana. Aorograptus victoriae (T. S. Hall), together with Adelogratus cf. A. altus Williams and Stevens and Ancoragraptus bulmani (Spjeldnaes) are described for the first time in the Santa Victoria area. These species come from the upper beds of the Santa Rosita Formation, expanding the distribution of the A. victoriae Biozone. The complete succession of the Aorograptus victoriae, Araneograptus murrayi, Hunnegraptus copiosus, Tetragraptus phyllograptoides, T. akzharensis, Baltograptus cf. B. deflexus and Didymograptellus bifidus biozones is confirmed for the first time at a single locality in the Cordillera Oriental, indicating a late Tremadocian-late Floian age for the upper deposits of the Santa Rosita Formation and the Acoite Formation in the studied area. The co-occurrence of trilobites with the records of these graptolite biozones enables a better resolution of the upper boundary of the Notopeltis orthometopa Biozone and the definition of associations partially filling gaps in the succession of traditional trilobite biozones (Asaphellus cf. A. stenorhachis/Leptoplastides and Megistaspis (Ekeraspis) associations). It also contributes towards clarifying the distribution of some members of the well-known Thysanopyge Fauna (T. taurinus, T. victoriensis and T. clavijoi). Together with the proposed framework, we also discuss previous records of conodonts and key palynomorphs (particularly chitinozoans) related to graptolite occurrences. Additionally, we provide new insights on regional and intercontinental correlation with classic Early Ordovician sections in northwestern Argentina (e.g., Pascha-Incamayo, Los Colorados, Mojotoro range and Humahuaca area), southern Bolivia and Balto-Scandinavia. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00027014_v52_n5_p535_Toro
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Floian Graptolites Northwestern Argentina Tremadocian Trilobites Western Gondwana biostratigraphy biozonation Gondwana Ordovician palynomorph population distribution succession trilobite age structure graptolite resolution Tremadocian Argentina Bolivia Scandinavia Cordillera Oriental [Argentina] Aorograptus victoriae Chitinozoa Rosita Trilobitomorpha
spellingShingle	Floian Graptolites Northwestern Argentina Tremadocian Trilobites Western Gondwana biostratigraphy biozonation Gondwana Ordovician palynomorph population distribution succession trilobite age structure graptolite resolution Tremadocian Argentina Bolivia Scandinavia Cordillera Oriental [Argentina] Aorograptus victoriae Chitinozoa Rosita Trilobitomorpha Toro, B.A. Arcerito, F.R.M. Muñoz, D.F. Waisfeld, B.G. De La Puente, G.S. Graptolite-trilobite biostratigraphy in the Santa Victoria area, northwestern Argentina. A key for regional and worldwide correlation of the Lower Ordovician (Tremadocian-Floian)
topic_facet	Floian Graptolites Northwestern Argentina Tremadocian Trilobites Western Gondwana biostratigraphy biozonation Gondwana Ordovician palynomorph population distribution succession trilobite age structure graptolite resolution Tremadocian Argentina Bolivia Scandinavia Cordillera Oriental [Argentina] Aorograptus victoriae Chitinozoa Rosita Trilobitomorpha
description	New graptolite-trilobite records provide relevant information for the biostratigraphic framework of the lower Paleozoic in western Gondwana. Aorograptus victoriae (T. S. Hall), together with Adelogratus cf. A. altus Williams and Stevens and Ancoragraptus bulmani (Spjeldnaes) are described for the first time in the Santa Victoria area. These species come from the upper beds of the Santa Rosita Formation, expanding the distribution of the A. victoriae Biozone. The complete succession of the Aorograptus victoriae, Araneograptus murrayi, Hunnegraptus copiosus, Tetragraptus phyllograptoides, T. akzharensis, Baltograptus cf. B. deflexus and Didymograptellus bifidus biozones is confirmed for the first time at a single locality in the Cordillera Oriental, indicating a late Tremadocian-late Floian age for the upper deposits of the Santa Rosita Formation and the Acoite Formation in the studied area. The co-occurrence of trilobites with the records of these graptolite biozones enables a better resolution of the upper boundary of the Notopeltis orthometopa Biozone and the definition of associations partially filling gaps in the succession of traditional trilobite biozones (Asaphellus cf. A. stenorhachis/Leptoplastides and Megistaspis (Ekeraspis) associations). It also contributes towards clarifying the distribution of some members of the well-known Thysanopyge Fauna (T. taurinus, T. victoriensis and T. clavijoi). Together with the proposed framework, we also discuss previous records of conodonts and key palynomorphs (particularly chitinozoans) related to graptolite occurrences. Additionally, we provide new insights on regional and intercontinental correlation with classic Early Ordovician sections in northwestern Argentina (e.g., Pascha-Incamayo, Los Colorados, Mojotoro range and Humahuaca area), southern Bolivia and Balto-Scandinavia.
format	JOUR
author	Toro, B.A. Arcerito, F.R.M. Muñoz, D.F. Waisfeld, B.G. De La Puente, G.S.
author_facet	Toro, B.A. Arcerito, F.R.M. Muñoz, D.F. Waisfeld, B.G. De La Puente, G.S.
author_sort	Toro, B.A.
title	Graptolite-trilobite biostratigraphy in the Santa Victoria area, northwestern Argentina. A key for regional and worldwide correlation of the Lower Ordovician (Tremadocian-Floian)
title_short	Graptolite-trilobite biostratigraphy in the Santa Victoria area, northwestern Argentina. A key for regional and worldwide correlation of the Lower Ordovician (Tremadocian-Floian)
title_full	Graptolite-trilobite biostratigraphy in the Santa Victoria area, northwestern Argentina. A key for regional and worldwide correlation of the Lower Ordovician (Tremadocian-Floian)
title_fullStr	Graptolite-trilobite biostratigraphy in the Santa Victoria area, northwestern Argentina. A key for regional and worldwide correlation of the Lower Ordovician (Tremadocian-Floian)
title_full_unstemmed	Graptolite-trilobite biostratigraphy in the Santa Victoria area, northwestern Argentina. A key for regional and worldwide correlation of the Lower Ordovician (Tremadocian-Floian)
title_sort	graptolite-trilobite biostratigraphy in the santa victoria area, northwestern argentina. a key for regional and worldwide correlation of the lower ordovician (tremadocian-floian)
url	http://hdl.handle.net/20.500.12110/paper_00027014_v52_n5_p535_Toro
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Graptolite-trilobite biostratigraphy in the Santa Victoria area, northwestern Argentina. A key for regional and worldwide correlation of the Lower Ordovician (Tremadocian-Floian)

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