Upper Cretaceous foraminifera and palynomorphs from Ekelöf coast Section, Ekelöf Point, Eastern James Ross Island, Antarctic Peninsula

A micropaleontological analysis of foraminifera and palynomorphs obtained from a partial sedimentary section cropping out at Ekelöf Point, eastern James Ross Island, Antarctic Peninsula, is presented. The section, named Ekelöf Coast, includes the lowest levels of the Upper Cretaceous Hamilton Point...

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Detalles Bibliográficos
Autores principales: Carames, Andrea Alejandra, Concheyro, Graciela Andrea
Publicado: 2016
Materias:
Antarctic Peninsula
Foraminifera
James Ross Island
Palynomorphs
Upper Cretaceous
Campanian
coastal sediment
continental shelf
Cretaceous
dinoflagellate cyst
foraminifera
Maastrichtian
marine environment
micropaleontology
paleoecology
paleoenvironment
palynomorph
pollen
Antarctica
Snow Hill Island
West Antarctica
Dinophyceae
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00027014_v53_n3_p333_Carames
http://hdl.handle.net/20.500.12110/paper_00027014_v53_n3_p333_Carames
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_00027014_v53_n3_p333_Carames
record_format dspace
spelling paper:paper_00027014_v53_n3_p333_Carames2023-06-08T14:22:31Z Upper Cretaceous foraminifera and palynomorphs from Ekelöf coast Section, Ekelöf Point, Eastern James Ross Island, Antarctic Peninsula Carames, Andrea Alejandra Concheyro, Graciela Andrea Antarctic Peninsula Foraminifera James Ross Island Palynomorphs Upper Cretaceous Campanian coastal sediment continental shelf Cretaceous dinoflagellate cyst foraminifera Maastrichtian marine environment micropaleontology paleoecology paleoenvironment palynomorph pollen Antarctic Peninsula Antarctica James Ross Island Snow Hill Island West Antarctica Dinophyceae Foraminifera A micropaleontological analysis of foraminifera and palynomorphs obtained from a partial sedimentary section cropping out at Ekelöf Point, eastern James Ross Island, Antarctic Peninsula, is presented. The section, named Ekelöf Coast, includes the lowest levels of the Upper Cretaceous Hamilton Point Member of the Snow Hill Island Formation. Among the foraminifera, 18 benthictaxa including 10 agglutinated and eight calcareous are recognized. Palynomorphs include continental and marine species. The continental assemblage contains 44 spore and pollen species. The marine assemblage consists of 10 peridinioid dinoflagellate cysts species, dominating in number of specimens, and 10 gonyaulacoids. Although the palynomorph assemblage supports a late Campanian age for the section, an earliest Maastrichtian age is not excluded. The paleoenvironmental interpretation based on the distribution of foraminiferal morphogroups indicates an outer shelf-upper bathyal environment in agreement with sedimentological data. The paleoenvironmental inference based on the S/D ratio (sporomorph versus din of lagellate cysts) and the P/G ratio (pendinioid versus gonyaulacoid cysts) suggest a coastal to inner neritic setting with a continuous continental supply from the continent to the marine environment, evidenced by the slight dominance of the peridionoids over gonyaulacoids cysts. The discrepancy observed between palynological and micropaleontological-sedimentological data may be linked to the development of a narrow continental shelf during the Late Cretaceous. In such continental shelf, terrestrial palynomorphs and peridinoid cysts would quickly run down the slope and would be deposited in the deep marine environment together with gonyaulacoid cysts. Fil:Caramés, A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Concheyro, A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2016 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00027014_v53_n3_p333_Carames http://hdl.handle.net/20.500.12110/paper_00027014_v53_n3_p333_Carames
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Antarctic Peninsula
Foraminifera
James Ross Island
Palynomorphs
Upper Cretaceous
Campanian
coastal sediment
continental shelf
Cretaceous
dinoflagellate cyst
foraminifera
Maastrichtian
marine environment
micropaleontology
paleoecology
paleoenvironment
palynomorph
pollen
Antarctic Peninsula
Antarctica
James Ross Island
Snow Hill Island
West Antarctica
Dinophyceae
Foraminifera
spellingShingle Antarctic Peninsula
Foraminifera
James Ross Island
Palynomorphs
Upper Cretaceous
Campanian
coastal sediment
continental shelf
Cretaceous
dinoflagellate cyst
foraminifera
Maastrichtian
marine environment
micropaleontology
paleoecology
paleoenvironment
palynomorph
pollen
Antarctic Peninsula
Antarctica
James Ross Island
Snow Hill Island
West Antarctica
Dinophyceae
Foraminifera
Carames, Andrea Alejandra
Concheyro, Graciela Andrea
Upper Cretaceous foraminifera and palynomorphs from Ekelöf coast Section, Ekelöf Point, Eastern James Ross Island, Antarctic Peninsula
topic_facet Antarctic Peninsula
Foraminifera
James Ross Island
Palynomorphs
Upper Cretaceous
Campanian
coastal sediment
continental shelf
Cretaceous
dinoflagellate cyst
foraminifera
Maastrichtian
marine environment
micropaleontology
paleoecology
paleoenvironment
palynomorph
pollen
Antarctic Peninsula
Antarctica
James Ross Island
Snow Hill Island
West Antarctica
Dinophyceae
Foraminifera
description A micropaleontological analysis of foraminifera and palynomorphs obtained from a partial sedimentary section cropping out at Ekelöf Point, eastern James Ross Island, Antarctic Peninsula, is presented. The section, named Ekelöf Coast, includes the lowest levels of the Upper Cretaceous Hamilton Point Member of the Snow Hill Island Formation. Among the foraminifera, 18 benthictaxa including 10 agglutinated and eight calcareous are recognized. Palynomorphs include continental and marine species. The continental assemblage contains 44 spore and pollen species. The marine assemblage consists of 10 peridinioid dinoflagellate cysts species, dominating in number of specimens, and 10 gonyaulacoids. Although the palynomorph assemblage supports a late Campanian age for the section, an earliest Maastrichtian age is not excluded. The paleoenvironmental interpretation based on the distribution of foraminiferal morphogroups indicates an outer shelf-upper bathyal environment in agreement with sedimentological data. The paleoenvironmental inference based on the S/D ratio (sporomorph versus din of lagellate cysts) and the P/G ratio (pendinioid versus gonyaulacoid cysts) suggest a coastal to inner neritic setting with a continuous continental supply from the continent to the marine environment, evidenced by the slight dominance of the peridionoids over gonyaulacoids cysts. The discrepancy observed between palynological and micropaleontological-sedimentological data may be linked to the development of a narrow continental shelf during the Late Cretaceous. In such continental shelf, terrestrial palynomorphs and peridinoid cysts would quickly run down the slope and would be deposited in the deep marine environment together with gonyaulacoid cysts.
author Carames, Andrea Alejandra
Concheyro, Graciela Andrea
author_facet Carames, Andrea Alejandra
Concheyro, Graciela Andrea
author_sort Carames, Andrea Alejandra
title Upper Cretaceous foraminifera and palynomorphs from Ekelöf coast Section, Ekelöf Point, Eastern James Ross Island, Antarctic Peninsula
title_short Upper Cretaceous foraminifera and palynomorphs from Ekelöf coast Section, Ekelöf Point, Eastern James Ross Island, Antarctic Peninsula
title_full Upper Cretaceous foraminifera and palynomorphs from Ekelöf coast Section, Ekelöf Point, Eastern James Ross Island, Antarctic Peninsula
title_fullStr Upper Cretaceous foraminifera and palynomorphs from Ekelöf coast Section, Ekelöf Point, Eastern James Ross Island, Antarctic Peninsula
title_full_unstemmed Upper Cretaceous foraminifera and palynomorphs from Ekelöf coast Section, Ekelöf Point, Eastern James Ross Island, Antarctic Peninsula
title_sort upper cretaceous foraminifera and palynomorphs from ekelöf coast section, ekelöf point, eastern james ross island, antarctic peninsula
publishDate 2016
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00027014_v53_n3_p333_Carames
http://hdl.handle.net/20.500.12110/paper_00027014_v53_n3_p333_Carames
work_keys_str_mv AT caramesandreaalejandra uppercretaceousforaminiferaandpalynomorphsfromekelofcoastsectionekelofpointeasternjamesrossislandantarcticpeninsula
AT concheyrogracielaandrea uppercretaceousforaminiferaandpalynomorphsfromekelofcoastsectionekelofpointeasternjamesrossislandantarcticpeninsula
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