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 +8 more
doaj +4 more sources
Brazilian Journal of Geology, 2023 The objectives of this study were the biostratigraphic and paleobiogeographic interpretations of the calcareous nannofossil records of the Romualdo Formation (Aptian-Albian) in the south-central portion of the Araripe Basin.
Flávia Azevedo Pedrosa Lemos +9 more
doaj +2 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 +2 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 +5 more
europepmc +4 more sources
Frontiers in Earth ScienceMercury (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 +8 more
doaj +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 +3 more
doaj +3 more sources
The first theropod dinosaur (Coelurosauria, Theropoda) from the base of the Romualdo Formation (Albian), Araripe Basin, Northeast Brazil. [PDF]
Sci Rep, 2020 AbstractThe Romualdo Formation (Araripe Basin) is worldwide known for the large number of well-preserved fossils but the dinosaur record is rather scarce. Here we describe a new coelurosaur, which is the first tetrapod recovered from the basal layers of this stratigraphic unit that consist of dark shales. Aratasaurus museunacionali gen. et sp. nov.
Sayão JM +8 more
europepmc +4 more sources
Author Correction: The first theropod dinosaur (Coelurosauria, Theropoda) from the base of the Romualdo Formation (Albian), Araripe Basin, Northeast Brazil. [PDF]
Sci Rep, 2020 An amendment to this paper has been published and can be accessed via a link at the top of the paper.
Sayão JM +8 more
europepmc +3 more sources
Anuário do Instituto de Geociências, 2022 The phylum Mollusca includes one of the most beautiful examples of colour patterns in present-day shells. However, they are rare in the fossil record because they demand excellent fossilization. In Brazil, colour patterns in fossil mollusk shells are recorded in gastropods Natica aff.
Priscilla Albuquerque Pereira +7 more
openaire +2 more sources
Correlations in weighted networks [PDF]
, 2006 We develop a statistical theory to characterize correlations in weighted networks. We define the appropriate metrics quantifying correlations and show that strictly uncorrelated weighted networks do not exist due to the presence of structural constraints.
Boguñá, Marián +2 more
core +7 more sources