Miospores and chlorococcalean algae from the Los Rastros Formation, Middle to Upper Triassic of central-western Argentina

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Lacustrine strata of the Los Rastros Formation (Middle to Upper Triassic) at Río Gualo section (La Rioja province), yield a distinctive palynological assemblage of miospores and chlorococcalean algae. The miospore association is characterized by a relative abundance of corystosperm pollen grains wit...

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Autores principales:	Ottone, Eduardo Guillermo, Mancuso, Adriana Cecilia
Publicado:	2005
Materias:	Argentina Lacustrine environment Miospores and chlorococcalean algae Systematics Triassic alga microfossil South America Western Hemisphere World algae Botryococcus Chlorococcales Hydrodictyaceae
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00027014_v42_n2_p347_Ottone http://hdl.handle.net/20.500.12110/paper_00027014_v42_n2_p347_Ottone
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_00027014_v42_n2_p347_Ottone
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spelling	paper:paper_00027014_v42_n2_p347_Ottone2023-06-08T14:22:10Z Miospores and chlorococcalean algae from the Los Rastros Formation, Middle to Upper Triassic of central-western Argentina Ottone, Eduardo Guillermo Mancuso, Adriana Cecilia Argentina Lacustrine environment Miospores and chlorococcalean algae Systematics Triassic alga microfossil Triassic Argentina South America Western Hemisphere World algae Botryococcus Chlorococcales Hydrodictyaceae Lacustrine strata of the Los Rastros Formation (Middle to Upper Triassic) at Río Gualo section (La Rioja province), yield a distinctive palynological assemblage of miospores and chlorococcalean algae. The miospore association is characterized by a relative abundance of corystosperm pollen grains with sub-ordinate inaperturates, diploxylonoid disaccates, spores, monocolpates, monosaccates and striate pollen grains. The phytoplankton are mostly represented by Botryococcus but also by Plaesiodictyon, a form probably related to the Hydrodictyaceae. Geological data and variations in phytoplankton content indicate that the lacustrine system probably evolved from a stretcht of freshwater with eutrophic conditions, into a body with oligotrophic conditions through the middle and upper part of the Río Gualo section. The genus Variapollenites is emended in order to amplify its original diagnosis. © Asociación Paleontológica Argentina. Fil:Ottone, E.G. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Mancuso, A.C. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2005 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00027014_v42_n2_p347_Ottone http://hdl.handle.net/20.500.12110/paper_00027014_v42_n2_p347_Ottone
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Argentina Lacustrine environment Miospores and chlorococcalean algae Systematics Triassic alga microfossil Triassic Argentina South America Western Hemisphere World algae Botryococcus Chlorococcales Hydrodictyaceae
spellingShingle	Argentina Lacustrine environment Miospores and chlorococcalean algae Systematics Triassic alga microfossil Triassic Argentina South America Western Hemisphere World algae Botryococcus Chlorococcales Hydrodictyaceae Ottone, Eduardo Guillermo Mancuso, Adriana Cecilia Miospores and chlorococcalean algae from the Los Rastros Formation, Middle to Upper Triassic of central-western Argentina
topic_facet	Argentina Lacustrine environment Miospores and chlorococcalean algae Systematics Triassic alga microfossil Triassic Argentina South America Western Hemisphere World algae Botryococcus Chlorococcales Hydrodictyaceae
description	Lacustrine strata of the Los Rastros Formation (Middle to Upper Triassic) at Río Gualo section (La Rioja province), yield a distinctive palynological assemblage of miospores and chlorococcalean algae. The miospore association is characterized by a relative abundance of corystosperm pollen grains with sub-ordinate inaperturates, diploxylonoid disaccates, spores, monocolpates, monosaccates and striate pollen grains. The phytoplankton are mostly represented by Botryococcus but also by Plaesiodictyon, a form probably related to the Hydrodictyaceae. Geological data and variations in phytoplankton content indicate that the lacustrine system probably evolved from a stretcht of freshwater with eutrophic conditions, into a body with oligotrophic conditions through the middle and upper part of the Río Gualo section. The genus Variapollenites is emended in order to amplify its original diagnosis. © Asociación Paleontológica Argentina.
author	Ottone, Eduardo Guillermo Mancuso, Adriana Cecilia
author_facet	Ottone, Eduardo Guillermo Mancuso, Adriana Cecilia
author_sort	Ottone, Eduardo Guillermo
title	Miospores and chlorococcalean algae from the Los Rastros Formation, Middle to Upper Triassic of central-western Argentina
title_short	Miospores and chlorococcalean algae from the Los Rastros Formation, Middle to Upper Triassic of central-western Argentina
title_full	Miospores and chlorococcalean algae from the Los Rastros Formation, Middle to Upper Triassic of central-western Argentina
title_fullStr	Miospores and chlorococcalean algae from the Los Rastros Formation, Middle to Upper Triassic of central-western Argentina
title_full_unstemmed	Miospores and chlorococcalean algae from the Los Rastros Formation, Middle to Upper Triassic of central-western Argentina
title_sort	miospores and chlorococcalean algae from the los rastros formation, middle to upper triassic of central-western argentina
publishDate	2005
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00027014_v42_n2_p347_Ottone http://hdl.handle.net/20.500.12110/paper_00027014_v42_n2_p347_Ottone
work_keys_str_mv	AT ottoneeduardoguillermo miosporesandchlorococcaleanalgaefromthelosrastrosformationmiddletouppertriassicofcentralwesternargentina AT mancusoadrianacecilia miosporesandchlorococcaleanalgaefromthelosrastrosformationmiddletouppertriassicofcentralwesternargentina
_version_	1768542340737138688

Miospores and chlorococcalean algae from the Los Rastros Formation, Middle to Upper Triassic of central-western Argentina

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