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Provedor de dados:  Ameghiniana
País:  Argentina
Título:  Miospores and chlorococcalean algae from the Los Rastros Formation, Middle to Upper Triassic of central-western Argentina
Autores:  Ottone,Eduardo G.
Mancuso,Adriana C.
Resano,Magdalena
Data:  2005-06-01
Ano:  2005
Palavras-chave:  Argentina
Triassic
Miospores and chlorococcalean algae
Systematics
Lacustrine environment
Resumo:  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 subordinate 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.
Tipo:  Info:eu-repo/semantics/article
Idioma:  Inglês
Identificador:  http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0002-70142005000200007
Editor:  Asociación Paleontológica Argentina
Formato:  text/html
Fonte:  Ameghiniana v.42 n.2 2005
Direitos:  info:eu-repo/semantics/openAccess
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