Centre for Earth and Space Research of the University of Coimbra

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Upper Barremian-lower Aptian charophyte biostratigraphy from Arrifes section (Algarve Basin, Southern Portugal): correlation with dinoflagellate cyst biostratigraphy

Publication . Pérez-Cano, J.; Pereira, H. J. R.; Mendes, Márcia; Pereira, Zélia; Callapez, Pedro M.; Fernandes, Paulo

ABSTRACT: The Arrifes section (Algarve Basin, Southern Portugal) has been studied from the viewpoint of char-ophyte biostratigraphy. The previous sedimentological studies in this section showed that it is built of the interbedding of continental and marine facies that contain both marine and continental palynomorphs (pollen, spores, and dinoflagellates), providing an excellent sedimentary context to perform direct cor-relations between marine and continental domains. In the present work, the identified charophyte biozones have been correlated with dinoflagellate biozones previously recognized in the Arrifes section, being the first time that these two biochronologies can be directly correlated. From the charophyte biostratigraphy viewpoint, two assemblages are distinguished. The older one is found between 65 and 135 m of the stratigraphic section, and it is composed of the species Echinochara lazarii, Atopochara trivolvis var. triquetra, A. trivolvis var. trivolvis, Clavator grovesii var. jiuquanensis, Clavator harrisii var. harrisii, C. harrisii var. reyi, and C. harrisii var. zavialensis. This assemblage belongs to the upper Barremian -lower Aptian Clavator grovesii var. jiuquanensis Eurasian biozone and also to the Ascidiella cruciata-Pseudoglobator paucibracteatus European biozone and it is described in beds with the dinoflagellate cyst Subtilisphaera scabrata (lower to lowermost upper Barremian) and Odontochitina operculata (from upper Barremian upwards). The younger charophyte assemblage is found between 135 and 155 m of the stratigraphic section, and it is composed of the species A. trivolvis var. trivolvis, Clavator grovesii var. corrugatus, Clavator harrisii var. harrisii, C. harrisii var. reyi, and C. harrisii var. zavialensis. This assemblage belongs to Clavator grovesii var. corrugatus biozone, previously assigned to upper Aptian (Clavator grovesii var. lusitanicus biozone). However, in the Arrifes section, this assemblage is found in beds assigned to the dinoflagellate cyst Odontochitina operculata (from upper Barremian-lower Aptian). The direct correlation of the base of the C. grovesii var. corrugatus biozone with the dinoflagellate cyst O. operculata, indicates that the base of the Clavator grovesii var. corrugatus biozone is in the upper lower Aptian, which is slightly older than was previously suggested, and it is extended until the middle Albian.

2023-10Journal article

Open access

Janela para os Museus de Ciência Portugueses

Publication . Barata, Carlos; Silva Marques, Carla Sofia; da Silva Lopes, Betina; Carvalho Soares, Diana Rita; Abrantes, Isabel; Gomes, Ana; Lopes, Fernando Carlos; Gomes, Elsa; Callapez Tonicher, Pedro Miguel

RESUMO: Enquadrada na implementação de Tecnologias de Informação e Comunicação (TIC) na educação, e nos avanços da tecnologia móvel, este estudo apresenta as fases iniciais da construção da aplicação digital (app), “Janela para os Museus de Ciência Portugueses”, com o objetivo de ser um recurso para o planeamento a longo e médio prazo, nomeadamente na definição de atividades desenvolvidas fora da escola. Atualmente, o estudo centra-se na integração de uma base de dados, com atividades dos museus/centros de ciência portugueses, em particular Geologia, numa app. Esta permitirá aos professores de ciências selecionar exposições e atividades a implementar nos museus, centros de ciência e centros interpretativos portugueses, com foco na Geologia. Apresentam-se as funções, as características e as etapas futuras deste estudo, com o objetivo de construir um recurso valioso para o ensino, incentivando a implementação de atividades de aprendizagem em museus de ciências.

2025-04Journal article

Open access