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