Biostratigrafia, paleoecologia e paleogeografia de palinomorfos do Cenomaniano médio da Nazaré (Portugal)

Translated title of the contribution: Biostratigraphy, palaeoecology and palaeobiogeography of palynomorphs from the middle Cenomanian of Nazaré (Portugal)

Luis Fernandes, Lígia Castro, Pedro Callapez, M. Isabel Caetano Alves

Research output: Contribution to conferencePaperpeer-review

Abstract

Resumo: No presente trabalho foram estudadas 12 amostras e efetuada a análise palinológica eestratigráfica de níveis laminíticos margosos e margo-calcários, do Cenomaniano médio, nopromontório da Nazaré. Identificaram-se 24 taxa de dinoquistos, pólenes, esporos, forros internos deforaminíferos, algas verdes e acritarcas. Nas associações de palinomorfos recuperadas merece destaque, do ponto de vista biostratigráfico, a presença de quistos de dinoflagelados, comdominância dos taxa Subtilisphaera sp., Xenascus sp. e o grupo Sentusidinium spp., sugerindoambientes neríticos internos de baixa profundidade com algum grau de confinamento(possivelmente salobros), sujeitos a incursões marinhas inferidas pela presença de Oligosphaeridiumsp., Florentinia sp., Palaeohystrichophora infusoriodes, Xenascus ceratioides, Coronifera oceanica, Downiesphaeridium sp. e Xiphophoridium alatum.

Abstract: The present study provides the palynological and stratigraphic analysis of marls and marly limestones sections of the middle Cenomanian on the Nazaré promontory. The palynological content recorded 24 taxa of dinocysts, pollen, spores, microforaminiferal linings, green-algae, and acritarchs, on a total of 12 samples. In the recovered palynomorphs deserves attention, from a biostratigraphic point of view, the presence of dinoflagellate cysts, which are dominated by Subtilisphaera sp., Xenascus sp. and Sentusidinium spp. group, suggesting a rather restricted shallow inner neritic environment (possibly brackish), open to marine influence, represented by Oligosphaeridium sp., Florentinia sp., Palaeohystrichophora infusoriodes, Xenascus ceratioides, Coronifera oceanica, Downiesphaeridium sp. and Xiphophoridium alatum.
Translated title of the contributionBiostratigraphy, palaeoecology and palaeobiogeography of palynomorphs from the middle Cenomanian of Nazaré (Portugal)
Original languagePortuguese
Pages63-66
Number of pages4
Publication statusPublished - 23 Nov 2019
EventIX Congresso Jovens Investigadores em Geociências - Pólo de Estremoz da Universidade de Évora, Évora, Portugal
Duration: 23 Nov 201926 Nov 2019
Conference number: IX

Conference

ConferenceIX Congresso Jovens Investigadores em Geociências
Abbreviated titleCJIG
CountryPortugal
CityÉvora
Period23/11/1926/11/19

Keywords

  • quistos de dinoflagelados
  • Cenomaniano médio
  • Paleoecologia
  • paleobiogeografia
  • Nazaré (Portugal)
  • Dinoflagellate cysts
  • Middle Cenomanian
  • palaeoecology
  • paleobiogeography

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