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

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, E.G., Mancuso, A.C., Resano, M.
Formato: JOUR
Materias:
Argentina
Lacustrine environment
Miospores and chlorococcalean algae
Systematics
Triassic
alga
microfossil
South America
Western Hemisphere
World
algae
Botryococcus
Chlorococcales
Hydrodictyaceae
Acceso en línea: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 todo:paper_00027014_v42_n2_p347_Ottone
record_format dspace
spelling todo:paper_00027014_v42_n2_p347_Ottone2023-10-03T13:52:55Z Miospores and chlorococcalean algae from the Los Rastros Formation, Middle to Upper Triassic of central-western Argentina Ottone, E.G. Mancuso, A.C. Resano, M. 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. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar 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, E.G.
Mancuso, A.C.
Resano, M.
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.
format JOUR
author Ottone, E.G.
Mancuso, A.C.
Resano, M.
author_facet Ottone, E.G.
Mancuso, A.C.
Resano, M.
author_sort Ottone, E.G.
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
url http://hdl.handle.net/20.500.12110/paper_00027014_v42_n2_p347_Ottone
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AT mancusoac miosporesandchlorococcaleanalgaefromthelosrastrosformationmiddletouppertriassicofcentralwesternargentina
AT resanom miosporesandchlorococcaleanalgaefromthelosrastrosformationmiddletouppertriassicofcentralwesternargentina
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