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Pegadas de terópodes da Formação de Papo Seco (Barremiano inferior, Cabo Espichel, Bacia Lusitânica)
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Abstract(s)
RESUMO: Descrevem-se novas pegadas de terópodes encontradas na Boca do Chapim, a norte do Cabo Espichel (Formação de Papo Seco, Barremiano inferior). Quatorze pegadas de terópodes foram identificadas na primeira camada desta formação. Foram identificados dois tipos diferentes de pegadas de terópodes, que ocorrem em diferentes áreas e níveis desta camada.
O primeiro tipo, constituído por pegadas mais pequenas e com dígitos finos, atribuímos a terópodes indeterminados; o outro tipo, constituído quatro pegadas, é atribuído ao icnogénero Megalosauripus isp.. Sugere-se que foram produzidos por terópodes de tamanho médio, sobre um substrato de lama carbonatada, provavelmente num ambiente costeiro associado a
uma lagoa. Estes vestígios e outros anteriormente descritos na subjacente Formação de Areia do Mastro, sugerem uma continuidade temporal dos principais grupos de dinossauros que frequentavam esta zona, durante o início do Barremiano, embora as pegadas da Formação de Papo Seco agora descritas sugiram uma maior diversificação das espécies de terópodes.
ABSTRACT: New theropod tracks found in Boca do Chapim, north of Cape Espichel (Papo Seco Formation, lower Barremian) are presented. fourteen theropod tracks were identified on the lowermost bed of this formation. Two different types of theropod footprints have been identified, which occur at two different levels of this beds. The first type, consisting of smaller footprints with narrow digits, is attributed to undetermined theropod tracks; the other type, consisting of four tracks, is assigned to the ichnogenus Megalosauripus isp.. It is suggested that they were produced by medium-sized theropods, on a carbonate mud substrate, probably in a coastal environment associated with a lagoon. These tracks and others previous described in the underlying Areia do Mastro Formation, suggest a temporal continuity of the principal groups of dinosaurs that frequented this area, during the early Barremian, although the tracks of the Papo Seo Formation described in this work suggest a greater diversification of the theropod species.
ABSTRACT: New theropod tracks found in Boca do Chapim, north of Cape Espichel (Papo Seco Formation, lower Barremian) are presented. fourteen theropod tracks were identified on the lowermost bed of this formation. Two different types of theropod footprints have been identified, which occur at two different levels of this beds. The first type, consisting of smaller footprints with narrow digits, is attributed to undetermined theropod tracks; the other type, consisting of four tracks, is assigned to the ichnogenus Megalosauripus isp.. It is suggested that they were produced by medium-sized theropods, on a carbonate mud substrate, probably in a coastal environment associated with a lagoon. These tracks and others previous described in the underlying Areia do Mastro Formation, suggest a temporal continuity of the principal groups of dinosaurs that frequented this area, during the early Barremian, although the tracks of the Papo Seo Formation described in this work suggest a greater diversification of the theropod species.
Description
Keywords
Pegadas de dinossauros Cretácico Inferior Cabo Espichel (Portugal) Bacia Lusitânica Dinosaur tracks Lower Cretaceous Lusitanian Basin
Citation
Figueiredo, S.,Carvalho, I., Cunha, P., Pereda-Suberbiola, X., Neto de Carvalho, C., Díaz-Martínez, I. & Garcias, T. (2025). Pegadas de terópodes da Formação de Papo Seco (Barremiano inferior, Cabo Espichel, Bacia Lusitânica). In: Comunicações Geológicas, 2025, vol. 112, Fascículo Especial I, pp. 81-85. https://doi.org/10.34637/e936-4184
Publisher
LNEG - Laboratório Nacional de Energia e Geologia