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Miospores and chlorococcalean algae from the Los Rastros Formation, Middle to Upper Triassic of central-western Argentina Ameghiniana
Ottone,Eduardo G.; Mancuso,Adriana C.; Resano,Magdalena.
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...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Argentina; Triassic; Miospores and chlorococcalean algae; Systematics; Lacustrine environment.
Ano: 2005 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0002-70142005000200007
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The Triassic insect fauna from Argentina: Coleoptera from the Los Rastros Formation (Bermejo Basin), La Rioja Province Ameghiniana
Martins-Neto,Rafael Gioia; Gallego,Oscar F.; Mancuso,Adriana C..
New fossil insect taxa from the Los Rastros Formation (early Late Triassic), La Rioja Province (Argentina) are described. Four new genera and fourteen new species of the order Coleoptera are proposed: Ademosyne arcucciae Martins-Neto and Gallego sp. nov., Ademosyne elongatus Martins-Neto and Gallego sp. nov., Ademosyne hexacostata Martins-Neto and Gallego sp. nov., Ademosyne punctuada Martins-Neto and Gallego sp. nov., Argentinosyne frenguellii Martins-Neto and Gallego gen. et sp. nov., Argentinosyne gonaldiae Martins-Neto and Gallego sp. nov., Argentinosyne gualoensis Martins-Neto and Gallego sp. nov., Argentinosyne rugosa Martins-Neto and Gallego sp. nov., Argentinosyne losrastrosensis Martins-Neto and Gallego sp. nov., (Permosynidae Tillyard),...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Triassic insects; Coleoptera; Los Rastros Formation; Argentina.
Ano: 2006 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0002-70142006000300007
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The Triassic insect fauna from the Los Rastros Formation (Bermejo Basin), La Rioja Province (Argentina): its context, taphonomy and paleobiology Ameghiniana
Mancuso,Adriana C.; Gallego,Oscar F.; Martins-Neto,Rafael G..
In the Bermejo Basin, the Los Rastros Formation bears an abundant insect fauna, mainly of terrestrial winged adult organisms related to the Blattoptera and the Coleoptera orders. The insect remains are found in the black shales of the offshore lacustrine facies and their taphonomic features suggest that the specimens were allochthonous to the lake. The individuals appear to arrived alive to the lake and had a rapid fall trough the water column, thus, they are preserved intact. In contrast, some of them may have suffered fragmentation in air traspontation and/or biological attack during long periods of flotation.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Triassic; Insecta; Taphonomy; Los Rastros Formation; Argentina.
Ano: 2007 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0002-70142007000200006
Registros recuperados: 3
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