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Abstract:

Late Jurassic-Early Cretaceous nannoconid assemblages are reported from 11 sections in the Neuquén Basin. Six species and 11 subspecies of Nannoconus Kamptner are studied systematically. Among them, Nannoconus kamptneri minor Bralower, Nannoconus kamptneri kamptneri Brönnimann, Nannoconus bucheri Brönnimann, Nannoconus circularis Deres and Achéritéguy and Nannoconus ligius Applegate and Bergen are highlighted as markers for the studied interval. Nannoconus elongatus minutus Van Niel, Nannoconus quadriangulus apertus Deflandre y Deflandre-Rigaud, Nannoconus truitti frequens Deres and Achéritéguy, Nannoconus truitti rectangularis Deres and Achéritéguy, Nannoconus truitti truitti Brönnimann are described for the first time in the Neuquén Basin. Nannoconus steinmannii minor Deres and Achéritéguy is reported for the first time in the Southern Hemisphere. The biostratigraphic analysis suggests an ampliation of the stratigraphic ranges of Nannoconus elongatus minutus, Nannoconus quadriangulus quadriangulus Deflandre and Deflandre-Rigaud, Nannoconus quadricanalis Bown and Concheyro, Nannoconus truitti frequens and Nannoconus truitti rectangularis. Changes in the composition and diversity of the recorded nannoconid assemblages suggest variations in the paleobiogeographic and paleoecological conditions that may be helpful in the characterization of the sedimentary environments represented in the Vaca Muerta and Agrio Formations.

Registro:

Documento: Artículo
Título:Nannoconids of the Mendoza Group (Lower cretaceous) Neuquen Province, Republica Argentina: Taxonomy, cronostratigraphy and paleogeographic significance
Autor:Lescano, M.; Concheyro, A.
Filiación:Instituto de Estudios Andinos Don Pablo Groeber (IDEAN - UBA - CONICET), Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Intendente Güiraldes 2160, Pabellón II, Ciudad Autónoma de Buenos Aires, C1428EGA, Argentina
Departamento Ciencias Geológicas, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Autónoma de Buenos Aires, C1428EGA, Argentina
Instituto Antártico Argentino, Balcarce 290, Ciudad Autónoma de Buenos Aires, C1064AAF, Argentina
Palabras clave:Biostratigraphy; Calcareous nannofossils; Neuquén Basin; Vaca Muerta and Agrio Formations; biostratigraphy; chronostratigraphy; fossil assemblage; Jurassic-Cretaceous boundary; microfossil; new record; paleobiogeography; paleoceanography; taxonomy; nanofossil; paleoecology; paleogeography; Southern Hemisphere; Argentina; Neuquen Basin; Neuquen; Nannoconus; Nannoconus ligius; Nannoconus quadricanalis
Año:2014
Volumen:51
Número:6
Página de inicio:466
Página de fin:499
DOI: http://dx.doi.org/10.5710/AMGH.06.08.2014.1838
Título revista:Ameghiniana
Título revista abreviado:Ameghiniana
ISSN:00027014
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00027014_v51_n6_p466_Lescano

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Citas:

---------- APA ----------
Lescano, M. & Concheyro, A. (2014) . Nannoconids of the Mendoza Group (Lower cretaceous) Neuquen Province, Republica Argentina: Taxonomy, cronostratigraphy and paleogeographic significance . Ameghiniana, 51(6), 466-499.
http://dx.doi.org/10.5710/AMGH.06.08.2014.1838
---------- CHICAGO ----------
Lescano, M., Concheyro, A. "Nannoconids of the Mendoza Group (Lower cretaceous) Neuquen Province, Republica Argentina: Taxonomy, cronostratigraphy and paleogeographic significance " . Ameghiniana 51, no. 6 (2014) : 466-499.
http://dx.doi.org/10.5710/AMGH.06.08.2014.1838
---------- MLA ----------
Lescano, M., Concheyro, A. "Nannoconids of the Mendoza Group (Lower cretaceous) Neuquen Province, Republica Argentina: Taxonomy, cronostratigraphy and paleogeographic significance " . Ameghiniana, vol. 51, no. 6, 2014, pp. 466-499.
http://dx.doi.org/10.5710/AMGH.06.08.2014.1838
---------- VANCOUVER ----------
Lescano, M., Concheyro, A. Nannoconids of the Mendoza Group (Lower cretaceous) Neuquen Province, Republica Argentina: Taxonomy, cronostratigraphy and paleogeographic significance . Ameghiniana. 2014;51(6):466-499.
http://dx.doi.org/10.5710/AMGH.06.08.2014.1838