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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ftunibueairesbd:todo:paper_00027014_v53_n3_p333_Carames 2023-10-29T02:32:28+01:00 Upper Cretaceous foraminifera and palynomorphs from Ekelöf coast Section, Ekelöf Point, Eastern James Ross Island, Antarctic Peninsula Caramés, A. Amenábar, C.R. Concheyro, A. https://hdl.handle.net/20.500.12110/paper_00027014_v53_n3_p333_Carames unknown http://hdl.handle.net/20.500.12110/paper_00027014_v53_n3_p333_Carames info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar Antarctic Peninsula Foraminifera James Ross Island Palynomorphs Upper Cretaceous Campanian coastal sediment continental shelf Cretaceous dinoflagellate cyst Maastrichtian marine environment micropaleontology paleoecology paleoenvironment palynomorph pollen Antarctica Snow Hill Island West Antarctica Dinophyceae JOUR ftunibueairesbd https://doi.org/20.500.12110/paper_00027014_v53_n3_p333_Carames 2023-10-05T01:33:47Z 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. Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Antarctica James Ross Island Ross Island Snow Hill Island West Antarctica Biblioteca Digital FCEN-UBA (Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires) |
institution |
Open Polar |
collection |
Biblioteca Digital FCEN-UBA (Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires) |
op_collection_id |
ftunibueairesbd |
language |
unknown |
topic |
Antarctic Peninsula Foraminifera James Ross Island Palynomorphs Upper Cretaceous Campanian coastal sediment continental shelf Cretaceous dinoflagellate cyst Maastrichtian marine environment micropaleontology paleoecology paleoenvironment palynomorph pollen Antarctica Snow Hill Island West Antarctica Dinophyceae |
spellingShingle |
Antarctic Peninsula Foraminifera James Ross Island Palynomorphs Upper Cretaceous Campanian coastal sediment continental shelf Cretaceous dinoflagellate cyst Maastrichtian marine environment micropaleontology paleoecology paleoenvironment palynomorph pollen Antarctica Snow Hill Island West Antarctica Dinophyceae Caramés, A. Amenábar, C.R. Concheyro, A. 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 Maastrichtian marine environment micropaleontology paleoecology paleoenvironment palynomorph pollen Antarctica Snow Hill Island West Antarctica Dinophyceae |
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. 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. |
format |
Journal/Newspaper |
author |
Caramés, A. Amenábar, C.R. Concheyro, A. |
author_facet |
Caramés, A. Amenábar, C.R. Concheyro, A. |
author_sort |
Caramés, A. |
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 |
url |
https://hdl.handle.net/20.500.12110/paper_00027014_v53_n3_p333_Carames |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica James Ross Island Ross Island Snow Hill Island West Antarctica |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica James Ross Island Ross Island Snow Hill Island West Antarctica |
op_relation |
http://hdl.handle.net/20.500.12110/paper_00027014_v53_n3_p333_Carames |
op_rights |
info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar |
op_doi |
https://doi.org/20.500.12110/paper_00027014_v53_n3_p333_Carames |
_version_ |
1781053952556531712 |