Results 11 to 20 of about 500 (140)

Physicochemical investigation of shrimp fossils from the Romualdo and Ipubi formations (Araripe Basin) [PDF]

PeerJ, 2019
The Ipubi and Romualdo Formations are Cretaceous units of the Araripe Basin (Santana Group). The first and most ancient was deposited in a lake environment, and some fossils were preserved in shales deposited under blackish conditions.
Olga Alcântara Barros, João Hermínio Silva, Gilberto Dantas Saraiva, Bartolomeu Cruz Viana, Alexandre Rocha Paschoal, Paulo Tarso Cavalcante Freire, Naiara Cipriano Oliveira, Amauri Jardim Paula, Maria Somália Viana   +8 more
doaj   +4 more sources

The coelurosaur theropods of the Romualdo formation, early Cretaceous (Aptian) of Brazil: Santanaraptor placidus meets Mirischia asymmetrica

The Anatomical Record, EarlyView.
Abstract The upper carbonate concretion levels of the Romualdo Formation (Aptian, Brazil) have yielded several theropod dinosaur remains, including spinosaurids and the coelurosaurs Santanaraptor placidus and Mirischia asymmetrica, the phylogenetic affinities of which are controversial.
Rafael Delcourt, Orlando Nelson Grillo, Christophe Hendrickx, Maximilian Kellermann, Max Cardoso Langer   +4 more
wiley   +4 more sources

Reinterpretation of Bakiribu waridza from the Romualdo Formation (Lower Cretaceous) of Brazil: a fish not a pterosaur

Anais da Academia Brasileira de Ciências
Fragmentary fossil remains from the Romualdo Formation (Lower Cretaceous) of Brazil, preserved in association with two fish were interpreted as two individuals of a new genus and species of ctenochasmatine pterosaur, Bakiribu waridza Pêgas et al.
DAVID M. UNWIN, ROY E. SMITH, SAMUEL L.A. COOPER, DAVID M. MARTILL   +3 more
doaj   +3 more sources

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

Brazilian Journal of Geology, 2018
: 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 ...
Ludmila Alves Cadeira do Prado, Gelson Luís Fambrini, Alcina Magnólia Franca Barreto   +2 more
doaj   +3 more sources

Extending the Geographic Range of Pterosaurs in the Araripe Basin: First Record from the Romualdo Formation (Araripe Basin) in Piauí, Brazil [PDF]

Anais da Academia Brasileira de Ciências
The Araripe Basin in northeastern Brazil is a key site for Cretaceous pterosaur fossils from Gondwanan deposits. Most discoveries are concentrated in its northern portion, particularly in Ceará state, within the Crato and Romualdo formations. In contrast,
RENAN A.M. BANTIM, ESAÚ V. DE ARAÚJO, ARTUR F.S. ARAÚJO, FLAVIANA J. DE LIMA, JULIANA M. SAYÃO, PAULO V. DE OLIVEIRA   +5 more
doaj   +3 more sources

New marine data and age accuracy of the Romualdo Formation, Araripe Basin, Brazil. [PDF]

Sci Rep, 2020
AbstractA combined biostratigraphic and palaeoecological study of foraminifera, ostracodes and microfacies was carried out on the Aptian in the Sítio Sobradinho section of the Araripe Basin, northeast Brazil. The analysed section represents a deepening-upward sequence with mid-ramp shoal and outer ramp to basin facies associations on a mixed ...
Melo RM, Guzmán J, Almeida-Lima D, Piovesan EK, Neumann VHML, Sousa AJE.   +5 more
europepmc   +4 more sources

New brachyuran crabs from the Aptian–Albian Romualdo Formation, Santana Group of Brazil: Evidence for a Tethyan connection to the Araripe Basin [PDF]

Acta Palaeontologica Polonica, 2018
Despite the exceptional palaeontological richness of the renowned Santana Group from the Early Cretaceous Araripe Basin of Brazil, only one specimen of true crabs (Brachyura) has been discovered to date.
Ludmila A.C. Prado, Javier Luque, Alcina M.F. Barreto, A. Richard Palmer   +3 more
doaj   +4 more sources

Reconstructing paleotrophic relationships on the Brazilian Romualdo Formation (Lower Cretaceous) through mercury analysis in fossils

Frontiers in Earth Science
Mercury (Hg) biomagnification values tend to reflect relationships between species in the trophic web, where larger values indicate higher positions in the web.
Lucas Silveira Antonietto, Igor Hamid, Borja Holgado, Borja Holgado, Antonio Leite Rocha, Maria Andréia Ferreira, Antônio Álamo Feitosa Saraiva, Luiz Drude de Lacerda, Rafael Costa da Silva   +8 more
doaj   +4 more sources

Validation of Chronocancer camilosantanai† Santana, Tavares, Martins, Melo & Pinheiro (Crustacea, Decapoda, Brachyura) from the Romualdo Formation, Araripe Sedimentary Basin, Brazil [PDF]

Papéis Avulsos de Zoologia, 2023
Santana et al. (2022) described a new genus and species of fossil crab, Chronocancer camilosantanai, from carbonate concretions of the Romualdo Formation of the Araripe Sedimentary Basin. The journal in which the description appeared was published online
William Santana, Marcos Tavares, Carlos Antônio Muniz Martins, José Patrício Pereira Melo, Allysson P. Pinheiro   +4 more
doaj   +1 more source

The Families Veneridae, Trochidae, Akeridae and Acteonidae (Mollusca), in the Romualdo Formation: Paleoecological and Paleobiogeographic Aspects in the Lower Cretaceous of the Araripe Basin, NE of Brazil [PDF]

Anuário do Instituto de Geociências, 2019
Fossil mollusks in the Araripe Sedimentary Basin have been reported since the 1960s, with bivalves present in the Crato and Romualdo formations and gastropods restricted to the latter.
Priscilla Albuquerque Pereira, Rita de Cassia Tardin Cassab, Alcina Magnólia Franca Barreto   +2 more
doaj   +1 more source