Stratigraphy, palynology, and conchostracans of a Lower Cretaceous sequence at the Cañadón Calcáreo locality, Extra-Andean central Patagonia: age and palaeoenvironmental significance

The first palynologic record in a Lower Cretaceous sequence at the Cañadón Calcáreo locality of Extra-Andean central Patagonia is presented. It contributes a more precise chronology and palaeoenvironmental characterization of the sequence. The conchostracan faunal records support the palynologic res...

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Detalles Bibliográficos
Autores principales: Cabaleri, Nora Graciela, Armella, Claudia
Publicado: 2009
Materias:
Conchostracans
Lower cretaceous
Palaeoenvironment
Palynology
Patagonia
Stratigraphy
biostratigraphy
brachiopod
chronology
Cretaceous
depositional environment
facies analysis
microfacies
paleoenvironment
palynology
sedimentology
sequence stratigraphy
South America
Bacteria (microorganisms)
Bryophyta
bryophytes
Classopollis
Conchostraca
Euestheria
Filicophyta
Nemestheria
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01956671_v30_n1_p270_Volkheimer
http://hdl.handle.net/20.500.12110/paper_01956671_v30_n1_p270_Volkheimer
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_01956671_v30_n1_p270_Volkheimer
record_format dspace
spelling paper:paper_01956671_v30_n1_p270_Volkheimer2023-06-08T15:20:12Z Stratigraphy, palynology, and conchostracans of a Lower Cretaceous sequence at the Cañadón Calcáreo locality, Extra-Andean central Patagonia: age and palaeoenvironmental significance Cabaleri, Nora Graciela Armella, Claudia Conchostracans Lower cretaceous Palaeoenvironment Palynology Patagonia Stratigraphy biostratigraphy brachiopod chronology Cretaceous depositional environment facies analysis microfacies paleoenvironment palynology sedimentology sequence stratigraphy Patagonia South America Bacteria (microorganisms) Bryophyta bryophytes Classopollis Conchostraca Euestheria Filicophyta Nemestheria The first palynologic record in a Lower Cretaceous sequence at the Cañadón Calcáreo locality of Extra-Andean central Patagonia is presented. It contributes a more precise chronology and palaeoenvironmental characterization of the sequence. The conchostracan faunal records support the palynologic results. Sedimentary environments are studied in relation to a tectogenetic development model. Detailed measurement of stratigraphic/sedimentologic sections in the field was complemented by sampling for palynology, conchostracans and sedimentary facies/microfacies analysis. The depositional environment is lacustrine/palustrine in the lower part, grading to fluvial. The middle and upper sections of the unit are fluvial and characterized by prevailing sandstones, conglomerates and tuffs. Dominant genera of the palynoflora are Classopollis and Callialasporites, with an incipient presence of Cyclusphaera. The prevalence of the thermophilous genus Classopollis indicates warm climatic conditions, and the high frequency and diversity of trilete spores, corresponding to a hygrophile vegetation of ferns and bryophytes, indicates locally humid conditions. The fauna of conchostracans identified is composed of species of the genera Nemestheria (Zhestheria), Pseudestherites, Euestheria?, and probably Congestheriella. A Valanginian age is inferred for the middle part of the sequence. © 2008 Elsevier Ltd. All rights reserved. Fil:Cabaleri, N.G. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Armella, C. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2009 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01956671_v30_n1_p270_Volkheimer http://hdl.handle.net/20.500.12110/paper_01956671_v30_n1_p270_Volkheimer
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Conchostracans
Lower cretaceous
Palaeoenvironment
Palynology
Patagonia
Stratigraphy
biostratigraphy
brachiopod
chronology
Cretaceous
depositional environment
facies analysis
microfacies
paleoenvironment
palynology
sedimentology
sequence stratigraphy
Patagonia
South America
Bacteria (microorganisms)
Bryophyta
bryophytes
Classopollis
Conchostraca
Euestheria
Filicophyta
Nemestheria
spellingShingle Conchostracans
Lower cretaceous
Palaeoenvironment
Palynology
Patagonia
Stratigraphy
biostratigraphy
brachiopod
chronology
Cretaceous
depositional environment
facies analysis
microfacies
paleoenvironment
palynology
sedimentology
sequence stratigraphy
Patagonia
South America
Bacteria (microorganisms)
Bryophyta
bryophytes
Classopollis
Conchostraca
Euestheria
Filicophyta
Nemestheria
Cabaleri, Nora Graciela
Armella, Claudia
Stratigraphy, palynology, and conchostracans of a Lower Cretaceous sequence at the Cañadón Calcáreo locality, Extra-Andean central Patagonia: age and palaeoenvironmental significance
topic_facet Conchostracans
Lower cretaceous
Palaeoenvironment
Palynology
Patagonia
Stratigraphy
biostratigraphy
brachiopod
chronology
Cretaceous
depositional environment
facies analysis
microfacies
paleoenvironment
palynology
sedimentology
sequence stratigraphy
Patagonia
South America
Bacteria (microorganisms)
Bryophyta
bryophytes
Classopollis
Conchostraca
Euestheria
Filicophyta
Nemestheria
description The first palynologic record in a Lower Cretaceous sequence at the Cañadón Calcáreo locality of Extra-Andean central Patagonia is presented. It contributes a more precise chronology and palaeoenvironmental characterization of the sequence. The conchostracan faunal records support the palynologic results. Sedimentary environments are studied in relation to a tectogenetic development model. Detailed measurement of stratigraphic/sedimentologic sections in the field was complemented by sampling for palynology, conchostracans and sedimentary facies/microfacies analysis. The depositional environment is lacustrine/palustrine in the lower part, grading to fluvial. The middle and upper sections of the unit are fluvial and characterized by prevailing sandstones, conglomerates and tuffs. Dominant genera of the palynoflora are Classopollis and Callialasporites, with an incipient presence of Cyclusphaera. The prevalence of the thermophilous genus Classopollis indicates warm climatic conditions, and the high frequency and diversity of trilete spores, corresponding to a hygrophile vegetation of ferns and bryophytes, indicates locally humid conditions. The fauna of conchostracans identified is composed of species of the genera Nemestheria (Zhestheria), Pseudestherites, Euestheria?, and probably Congestheriella. A Valanginian age is inferred for the middle part of the sequence. © 2008 Elsevier Ltd. All rights reserved.
author Cabaleri, Nora Graciela
Armella, Claudia
author_facet Cabaleri, Nora Graciela
Armella, Claudia
author_sort Cabaleri, Nora Graciela
title Stratigraphy, palynology, and conchostracans of a Lower Cretaceous sequence at the Cañadón Calcáreo locality, Extra-Andean central Patagonia: age and palaeoenvironmental significance
title_short Stratigraphy, palynology, and conchostracans of a Lower Cretaceous sequence at the Cañadón Calcáreo locality, Extra-Andean central Patagonia: age and palaeoenvironmental significance
title_full Stratigraphy, palynology, and conchostracans of a Lower Cretaceous sequence at the Cañadón Calcáreo locality, Extra-Andean central Patagonia: age and palaeoenvironmental significance
title_fullStr Stratigraphy, palynology, and conchostracans of a Lower Cretaceous sequence at the Cañadón Calcáreo locality, Extra-Andean central Patagonia: age and palaeoenvironmental significance
title_full_unstemmed Stratigraphy, palynology, and conchostracans of a Lower Cretaceous sequence at the Cañadón Calcáreo locality, Extra-Andean central Patagonia: age and palaeoenvironmental significance
title_sort stratigraphy, palynology, and conchostracans of a lower cretaceous sequence at the cañadón calcáreo locality, extra-andean central patagonia: age and palaeoenvironmental significance
publishDate 2009
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01956671_v30_n1_p270_Volkheimer
http://hdl.handle.net/20.500.12110/paper_01956671_v30_n1_p270_Volkheimer
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