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Mostrando ítems 1-10 de 27
Middle Ordovician (early Dapingian) conodonts in the Central Andean Basin of NW Argentina
(Taylor & Francis Ltd, 2013-07)
This paper describes and analyzes the significance of a conodont fauna from the Alto del Cóndor Formation, exposed in the Los Colorados region of the Argentine Eastern Cordillera. Identified taxa are Baltoniodus triangularis, ...
First Appearance Datums (FADs) of selected acritarch taxa and correlation between Lower and Middle Ordovician stages
(Wiley Blackwell Publishing, Inc, 2018-04)
First Appearance Datums (FADs) of selected, easily recognizable acritarch morphotypes are assessed to determine their potential contribution to correlation between Lower and Middle Ordovician stages and substage divisions ...
Selected Middle Ordovician key conodont species from the Santa Gertrudis Formation (Salta, Argentina): An approach to its biostratigraphical significance
(Cambridge University Press, 2018-05)
We have analysed a newly exposed conodont association from the Santa Gertrudis Formation in the Mojotoro Range, Eastern Cordillera of Salta province, Argentina. The key species Baltoniodus triangularis (Lindström), ...
Early–Middle Ordovician Graptolites from the Argentine Puna: Quantitative Paleobiogeographic Analysis Based on a Systematic RevisionGraptolitos del ordovícico temprano–medio de la puna argentina: Análisis paleobiogeográfico cuantitativo basado en una revisión sistemática
(Asociación Paleontológica Argentina, 2020-12)
. La revisión taxonómica actualizada de los graptolitos del Ordovícico Temprano–Medio de la Puna Oriental de Argentina permite describir por primera vez Sigmagraptus praecursor, Baltograptus extremus, B. geometricus, B. ...
Early-Middle Ordovician graptolites from the Argentine Puna: quantitative paleobiogeographic analysis based on a systematic revisionGraptolitos del Ordovícico Temprano-Medio de la Puna, Argentina: Análisis Paleobiogeográfico Cuantitativo basado en una revisión sistemática
(2020-07)
The updated taxonomic revision of the Early–Middle Ordovician graptolites from the eastern Argentine Puna allows describing Sigmagraptus praecursor, Baltograptus extremus, B. geometricus, B. vacillans, Cymatograptus
pr ...
Early Middle Ordovician evidence for land plants in Argentina (eastern Gondwana)
(Wiley Blackwell Publishing, Inc, 2010-10)
The advent of embryophytes (land plants) is among the most important evolutionary breakthroughs in Earth history. It irreversibly changed climates and biogeochemical processes on a global scale; it allowed all eukaryotic ...
Conodont biostratigraphy and correlation of the San Juan Formation at the Cerro La Silla section, middle Tremadocian-lower Dapingian, Central Precordillera, ArgentinaBioestratigrafía de conodontes y correlación de la Formación San Juan en el cerro La Silla, Tremadociano medio-Dapingiano inferior, precordillera Central, Argentina
(Servicio Nacional de Geología y Minería, 2020-09)
Este estudio presenta la bioestratigrafía de conodontes del tramo superior de la Formación La Silla (9,6 m) y la suprayacente Formación San Juan (264,7 m), en la sección del cerro La Silla, precordillera Central de San ...
Ordovician sponge spicules from Spitsbergen, Nevada and Newfoundland: new evidence for hexactinellid and demosponge early diversification
(Taylor & Francis, 2014-02)
Unusually well-preserved spicule assemblages from three Lower to Middle Ordovician localities are examined: Spitsbergen (Floian-Dapingian), Nevada (Vinini Formation, Dapingian) and Newfoundland (Cow Head Group, Tremadocian-lower ...
First Middle Ordovician conodont record related to key graptolites from the western Puna, Argentina: perspectives for an integrated biostratigraphy and correlation of the Central Andean BasinPrimer registro de conodontes del Ordovícico Medio asociado a graptolitos clave de la Puna occidental, Argentina: perspectivas para una bioestratigrafía y correlación integrada de la Cuenca Andina Central
(Servicio Nacional de Geología y Minería, 2020-01)
Nuevas investigaciones bioestratigráficas desarrolladas en el sector occidental de la Puna Argentina, permitieron obtener el primer registro del conodonte Baltoniodus cf. B. navis (Lindström) del Ordovícico Medio, asociado ...