Tafonomy of macroinvertebrates and Albian marine ingression as recorded by the Romualdo Formation (Cretaceous, Araripe Basin, Brazil)

Abstract

The Romualdo Formation, Araripe Basin, crops out in the municipality of Exu, Pernambuco State, exposing coquinas. Fauna survey, taphonomic analysis of the macrobenthos, and identification of sedimentary facies of the outcrop were carried out to contribute to paleoenvironmental understanding of the Romualdo Formation. The association of molluscs (Cerithium sp., Tylostoma ranchariensis, Aguileria dissita, Brachidontes araripensis and unidentified cassiopids) and echinoids of the species Bothryopneustes araripensis suggests sedimentation in the marine environment. The taphonomic similarities made possible the grouping of coquinas into two types. Coquinas type 1 exhibit characteristics of transport and reworking of bioclast generated by storms in proximal setting. Coquinas type 2 demonstrates echinoids in situ and articulated with spines connected to shells, suggesting a fast sedimentation by distal tempestite. Regarding sedimentary facies, the concentrations of invertebrates would have been formed in the transitional offshore zone of siliclastic platform. The results presented here evidence a broader distribution of echinoids and expand the geographic limits of the shallow marine environment in the Romualdo Formation.

Mapeamento da Borda Sul-Sudeste da Bacia do Araripe com auxílio de gamaespectrometria e magnetometria

“…Centenas de fósseis foram recuperados nessa formação, ao longo de quatro anos, com uma assembleia paleoictiológica típica da Formação Romualdo (Polck et al, 2015). Alguns dos materiais recuperados estão listados no Documento Suplementar 3 deste artigo, e a maioria foram publicados separadamente (Aureliano et al, 2014;Prado et al, 2018aPrado et al, , 2018bCavalcanti e Barreto, 2019;Pereira et al, 2022). Um perfil estratigráfico foi realizado na região do Sítio Zé Gomes, aproveitando uma atividade de garimpo (Figura 7).…”

Fósseis de Pernambuco: Desafios na Busca de Conexões para Integrar Sociedade a seus Acervos

“…Pereira et al (2015Pereira et al ( , 2016Pereira et al ( , 2017, Figura 3 Mapa do estado de Pernambuco destacando os 64 municípios com ocorrências fósseis. Prado et al (2014Prado et al ( , 2015Prado et al ( ,2016Prado et al ( , 2018, Duque & Barreto (2018a, 2018b, Lopes & Barreto (2019), Carvalho et al (2016Carvalho et al ( , 2019 têm levantado novos dados sobre a diversidade fossilífera do Araripe pernambucano.…”

Calcareous nannofossils, biostratigraphy, and paleobiogeography of the Aptian/Albian Romualdo Formation in the Araripe Basin, North-Eastern Brazil

“…The age of the Romualdo Formation has been attributed to the Aptian-Albian (Arai et al 1997, Arai and Assine 2020, Araripe et al 2022, Coimbra et al 2002, Custódio et al 2017, Melo et al 2020, Neumann et al 2002. In this formation, there is evidence of connections to the surrounding basins and the Tethys Sea, and although the influence of marine waters is clear, there are divergences regarding the seaway route (Arai 2014, Assine 1994, Beurlen 1963, Braun 1966, Fürsich et al 2019, Kroth et al 2021, Mabesoone and Tinoco 1973, Pereira et al 2016, Pereira et al 2018, Prado et al 2018.…”