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- W1511810862 abstract "Abstract. Lacustrine strata of the Los Rastros Formation (Middle to Upper Triassic) at Rio 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 Rio Gualo section. The genus Variapollenites is emended in order to amplify its original diagnosis.Resumen. MIOSPORAS Y ALGAS CHLOROCOCCALES DE LA FORMACION LOS RASTROS, TRIASICO MEDIO A SUPERIOR DEL CENTRO-OESTE DE ARGENTINA. El estudio de los niveles lacustres de la Formacion Los Rastros (Triasico Medio a Superior) en la seccion de Rio Gualo (provincia de La Rioja), incluye una interesante palinoflora compuesta por miosporas y algas Chlorococcales. Entre las miosporas abundan los granos de polen de Corystospermales, con presencia subordinada de inaperturados, disacados diploxilonoides, esporas, monocolpados, monosacados y polen estriado. En el fitoplancton se destaca Botryococcus, pero tambien se observa Plaesiodictyon, que es una forma probablemente relacionada con las Hydrodictyaceae. Datos geologicos y variaciones en el contenido fitoplanctologico senalan que el sistema lacustre probablemente evoluciono desde un cuerpo de agua dulce y condiciones eutroficas, a un ambiente de caracter oligotrofico hacia la parte media y superior de la seccion de Rio Gualo. Asi mismo, se enmienda el genero Variapollenites a fin de ampliar su diagnosis original." @default.
- W1511810862 created "2016-06-24" @default.
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- W1511810862 date "2005-06-01" @default.
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- W1511810862 title "Miospores and chlorococcalean algae from the Los Rastros Formation, Middle to Upper Triassic of central-western Argentina" @default.
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