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Palinologia do Cretácico Inferior de Catefica (Torres Vedras) : estado de conhecimentos
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Abstract(s)
RESUMO: Apresentam-se resultados de estudos palinológicos realizados no Cretácico Inferior de Catefica. A associação esporo-polínica foi recolhida em depósitos sedimentares da Formação de Almargem, expostos num afloramento, situado entre as localidades de Catefica e Mugideira, aproximadamente a 4 km sul de Torres Vedras (oeste de Portugal). O afloramento consiste em arenitos fluviais com estratificação cruzada e conglomerados, intercalados com níveis argilosos escuros, ricos de restos de vegetais fósseis. Nesta jazida foi reconhecida uma palinoflora rica e bem preservada, que contribui para a reconstrução da diversidade vegetal e para esclarecer as condições ambientais da região. A palinoflora é dominada por esporos de fetos e pólenes de gimnospérmicas. Os pólenes de angiospérmicas são relativamente comuns, mas subordinados entre os palinomorfos. Os dados palinológicos apontam para a presença de condições húmidas, relacionadas com ambiente fluvial pouco profundo. Além disso, a ocorrência de componentes xerófitos e de grãos de pólen bissacados, reflecte a presença de vegetação de coníferas em clima relativamente seco.
ABSTRACT: Results of palynological studies on the Lower Cretaceous of Catefica site are presented here. The spore-pollen assemblage was extracted from sedimentary deposits of the Almargem Formation exposed in a road cut, between the villages of Catefica and Mugideira, ca. 4 km south of Torres Vedras (western Portugal). The outcrop consists of fluvial cross-bedded sandstones and minor conglomerates, intercalated with dark organic mud levels. It was founded a rich and generally well preserved palynoflora that contributes to the reconstruction of the vegetation diversity and to enlighten the environmental conditions. The palynoflora is dominated by fern spores and gymnosperm pollen. Angiosperm pollen grains are relatively common, but subordinate among the palynomorphs. The available palynological data supports the evidence of humid conditions related to a shallow fluvial environment. Moreover, the presence of xerophytic components, together with bisaccate pollen grains, reflects the presence of conifer vegetation in a relatively dry climate.
ABSTRACT: Results of palynological studies on the Lower Cretaceous of Catefica site are presented here. The spore-pollen assemblage was extracted from sedimentary deposits of the Almargem Formation exposed in a road cut, between the villages of Catefica and Mugideira, ca. 4 km south of Torres Vedras (western Portugal). The outcrop consists of fluvial cross-bedded sandstones and minor conglomerates, intercalated with dark organic mud levels. It was founded a rich and generally well preserved palynoflora that contributes to the reconstruction of the vegetation diversity and to enlighten the environmental conditions. The palynoflora is dominated by fern spores and gymnosperm pollen. Angiosperm pollen grains are relatively common, but subordinate among the palynomorphs. The available palynological data supports the evidence of humid conditions related to a shallow fluvial environment. Moreover, the presence of xerophytic components, together with bisaccate pollen grains, reflects the presence of conifer vegetation in a relatively dry climate.
Description
Keywords
Palinomorfos Angiospérmica Cretácico Inferior Torres Vedras Portugal Palynomorphs Angiosperms Lower Cretaceous
Citation
Mendes, M., Cunha, P. & Dinis, P. (2025). Palinologia do Cretácico Inferior de Catefica (Torres Vedras) : estado de conhecimentos. In: Comunicações Geológicas, 2025, vol. 112, Fascículo Especial I, pp. 91-95. https://doi.org/10.34637/j083-wc47
Publisher
LNEG - Laboratório Nacional de Energia e Geologia