Data/hora: 09/06/2024 04:37:11

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	
Fonte: 	info:eu-repo/semantics/openAccess