Acritarcas silurianos da Formação Trombetas, Bacia do Amazonas
| Autor: | Sandra de Fátima Oliveira, Murilo Rodolfo de Lima |
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| Jazyk: | portugalština |
| Rok vydání: | 1990 |
| Předmět: | |
| Zdroj: | Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual) Universidade de São Paulo (USP) instacron:USP |
| Popis: | Analysis of a sample from the Viramundo falis, lower part of the Pitinga Member, Trombetas Formation, reveals a diversified and well-preserved palynoflora. Twenty-three species of acritarchs are identified, including several guide-fossils, indicative of a biostratigraphic interval corresponding to the Ludlovian. This assignrnent reinforces recent conclusions by other authors, supporting the idea of a gradational contact between the Trombetas Formation and the overlying Maecuru Formation. The assemblage was certainly deposited in a neritic marine environrnent, probably under low salinity conditions. |
| Databáze: | OpenAIRE |
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