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	Provedor de dados Ameghiniana (1) Anais da ABC (AABC) (1) Autor Chiglino,Leticia (1) Ferreira,Valderez P. (1) Gaucher,Claudio (1) Rubinstein,Claudia V. (1) Sial,Alcides N. (1) Steemans,Philippe (1) Mais... Palavra-chave Acritarchs (2) Argentina (1) Biostratigraphy (1) Devonian (1) Ediacaran (1) Mendoza (1) Miospores (1) Neoproterozoic (1) Northeastern Brazil (1) Palaeogeography (1) Precordillera (1) Mais... Tipo do documento Info:eu-repo/semantics/article (2) Ano 2015 (1) 2007 (1) País Argentina (1) Brazil (1) Idioma Inglês (2)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 2 Primeira ... 1 ... Última New palynological data from the Devonian Villavicencio Formation, Precordillera of Mendoza, Argentina Ameghiniana Rubinstein,Claudia V.; Steemans,Philippe. New terrestrial and marine palynomorphs of the lower part of the Villavicencio Formation, San Isidro Creek, Precordillera of Mendoza, Argentina, are evaluated. The palynomorph assemblage is dominated by miospores, and also contains acritarchs and scarce chitinozoans. Different processing methods have been tested due to the poor preservation state of the palynomorphs. The new slides provided abundant and diverse palynomorphs and allowed the recognition of 13 miospore species and two acritarch species. This review suggests a late Pragian to early Emsian age, thus confirming and refining previous palynological dating. The miospore assemblage may be correlated with the upper part of the Ems Biozone, in terms of the Devonian miospore zonation of the Brazilian... Tipo: Info:eu-repo/semantics/article Palavras-chave: Devonian; Miospores; Acritarchs; Biostratigraphy; Palaeogeography; Precordillera; Mendoza; Argentina. Ano: 2007 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0002-70142007000100001 Acritarchs of the Ediacaran Frecheirinha Formation, Ubajara Group, Northeastern Brazil Anais da ABC (AABC) Chiglino,Leticia; Gaucher,Claudio; Sial,Alcides N.; Ferreira,Valderez P.. We report for the first time the occurrence of organic-walled microfossils in Ediacaran limestones and marls of the Frecheirinha Formation, Ubajara Group, and the first Precambrian acritarchs so far reported for northeastern Brazil. The assemblage of the Frecheirinha Formation represents a low-diversity microflora comprising Leiosphaeridia, Lophosphaeridium and subordinated Bavlinella (=Sphaerocongregus). Their thermal alteration index (TAI) between 4+ and 5, suggests metamorphic temperatures exceeding 200-250°C. Higher temperatures are probably related to intruding granitic plutons (Meruoca, Mucambo). Reported δ13C values of carbonates of -3.5 ‰ VPDB (Vienna-Peedee Belemnite) at the base, passing up section into a positive plateau of up to +3.7 ‰, and... Tipo: Info:eu-repo/semantics/article Palavras-chave: Acritarchs; Ediacaran; Neoproterozoic; Northeastern Brazil. Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000200635 Registros recuperados: 2 Primeira ... 1 ... Última

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