Stratigraphy and fossil mammals from the Toro Negro Formation (Neogene), Vinchina Department, northwestern La Rioja Province, Argentina

The Toro Negro Formation is exposed in the western range of the Sierra de Los Colorados, in the North-West of La Rioja Province, Argentina. The sequence in La Troya creek (type section) is composed by a succession of epiclastic and piroclastic deposits, where thick-bedded sandstones and mudstones wi...

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Detalles Bibliográficos
Publicado: 2006
Materias:
La Rioja
Mammals
Neogene
Stratigraphy
Toro Negro Formation
climate conditions
fossil
mammal
Pliocene
stratigraphy
Argentina
La Rioja [Argentina]
South America
Abrocoma
Cingulata
Litopterna
Mammalia
Rodentia
Tardigrada
Zanclea
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00027014_v43_n2_p257_RodriguezBrizuela
http://hdl.handle.net/20.500.12110/paper_00027014_v43_n2_p257_RodriguezBrizuela
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_00027014_v43_n2_p257_RodriguezBrizuela
record_format dspace
spelling paper:paper_00027014_v43_n2_p257_RodriguezBrizuela2023-06-08T14:22:11Z Stratigraphy and fossil mammals from the Toro Negro Formation (Neogene), Vinchina Department, northwestern La Rioja Province, Argentina La Rioja Mammals Neogene Stratigraphy Toro Negro Formation climate conditions fossil mammal Neogene Pliocene stratigraphy Argentina La Rioja [Argentina] South America Abrocoma Cingulata Litopterna Mammalia Rodentia Tardigrada Zanclea The Toro Negro Formation is exposed in the western range of the Sierra de Los Colorados, in the North-West of La Rioja Province, Argentina. The sequence in La Troya creek (type section) is composed by a succession of epiclastic and piroclastic deposits, where thick-bedded sandstones and mudstones with interbedded conglomeradic lenses and tuff levels predominate. The facies analysis suggests a fluvial depositional environment of sand bed braided rivers for the lower Member and high efficiency alluvial fans for the upper Member. The species recorded are: Proeuphractus limpidus Ameghino, Chorobates villosissimus (Rovereto) Reig, Paleuphractus sp. Bordas, Doellotatus inornatus (Rovereto) Castellanos, Lomaphorops corallinus Rovereto, Neuryurus cf. giganteus, cf. Urotherium sp. (Mammalia, Cingulata), Xyophorus aff. bondesioi Scillato Yané, cf. Plesiomergatherium, cf. Proscelidodon sp. (Mammalia, Tardigrada), Abrocoma sp., Protabrocoma sp., Propediolagus sp. (Mammalia, Rodentia), Eoauchenia sp. (Mammalia, Litopterna). This faunistic association suggests: 1) Lower Pliocene age; 2) climate conditions that changed from arid to warm-temperate, or the development of arid areas in a general context of more humid conditions; 3) open areas of herbaceous and shrub vegetation and arboreal formation probably existed; 4) the record of the nothrotherin Xyophorus aff. bondesioi is related to the faunistic and climatic changes during the Middle Miocene; 5) the existence of a zoogeographic connection between the subandean and Pampean regions during the Pliocene. © Asociación Paleontológica Argentina. 2006 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00027014_v43_n2_p257_RodriguezBrizuela http://hdl.handle.net/20.500.12110/paper_00027014_v43_n2_p257_RodriguezBrizuela
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic La Rioja
Mammals
Neogene
Stratigraphy
Toro Negro Formation
climate conditions
fossil
mammal
Neogene
Pliocene
stratigraphy
Argentina
La Rioja [Argentina]
South America
Abrocoma
Cingulata
Litopterna
Mammalia
Rodentia
Tardigrada
Zanclea
spellingShingle La Rioja
Mammals
Neogene
Stratigraphy
Toro Negro Formation
climate conditions
fossil
mammal
Neogene
Pliocene
stratigraphy
Argentina
La Rioja [Argentina]
South America
Abrocoma
Cingulata
Litopterna
Mammalia
Rodentia
Tardigrada
Zanclea
Stratigraphy and fossil mammals from the Toro Negro Formation (Neogene), Vinchina Department, northwestern La Rioja Province, Argentina
topic_facet La Rioja
Mammals
Neogene
Stratigraphy
Toro Negro Formation
climate conditions
fossil
mammal
Neogene
Pliocene
stratigraphy
Argentina
La Rioja [Argentina]
South America
Abrocoma
Cingulata
Litopterna
Mammalia
Rodentia
Tardigrada
Zanclea
description The Toro Negro Formation is exposed in the western range of the Sierra de Los Colorados, in the North-West of La Rioja Province, Argentina. The sequence in La Troya creek (type section) is composed by a succession of epiclastic and piroclastic deposits, where thick-bedded sandstones and mudstones with interbedded conglomeradic lenses and tuff levels predominate. The facies analysis suggests a fluvial depositional environment of sand bed braided rivers for the lower Member and high efficiency alluvial fans for the upper Member. The species recorded are: Proeuphractus limpidus Ameghino, Chorobates villosissimus (Rovereto) Reig, Paleuphractus sp. Bordas, Doellotatus inornatus (Rovereto) Castellanos, Lomaphorops corallinus Rovereto, Neuryurus cf. giganteus, cf. Urotherium sp. (Mammalia, Cingulata), Xyophorus aff. bondesioi Scillato Yané, cf. Plesiomergatherium, cf. Proscelidodon sp. (Mammalia, Tardigrada), Abrocoma sp., Protabrocoma sp., Propediolagus sp. (Mammalia, Rodentia), Eoauchenia sp. (Mammalia, Litopterna). This faunistic association suggests: 1) Lower Pliocene age; 2) climate conditions that changed from arid to warm-temperate, or the development of arid areas in a general context of more humid conditions; 3) open areas of herbaceous and shrub vegetation and arboreal formation probably existed; 4) the record of the nothrotherin Xyophorus aff. bondesioi is related to the faunistic and climatic changes during the Middle Miocene; 5) the existence of a zoogeographic connection between the subandean and Pampean regions during the Pliocene. © Asociación Paleontológica Argentina.
title Stratigraphy and fossil mammals from the Toro Negro Formation (Neogene), Vinchina Department, northwestern La Rioja Province, Argentina
title_short Stratigraphy and fossil mammals from the Toro Negro Formation (Neogene), Vinchina Department, northwestern La Rioja Province, Argentina
title_full Stratigraphy and fossil mammals from the Toro Negro Formation (Neogene), Vinchina Department, northwestern La Rioja Province, Argentina
title_fullStr Stratigraphy and fossil mammals from the Toro Negro Formation (Neogene), Vinchina Department, northwestern La Rioja Province, Argentina
title_full_unstemmed Stratigraphy and fossil mammals from the Toro Negro Formation (Neogene), Vinchina Department, northwestern La Rioja Province, Argentina
title_sort stratigraphy and fossil mammals from the toro negro formation (neogene), vinchina department, northwestern la rioja province, argentina
publishDate 2006
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00027014_v43_n2_p257_RodriguezBrizuela
http://hdl.handle.net/20.500.12110/paper_00027014_v43_n2_p257_RodriguezBrizuela
_version_ 1768546562991980544

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