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Stratigraphic and Paleoenvironmental Context of the Macroinvertebrate Assemblages of the Romualdo Formation, Cretaceous, Araripe Basin, and its Paleogeographic Implications

Grant number: 17/20803-1
Support type:Scholarships in Brazil - Post-Doctorate
Effective date (Start): March 01, 2018
Effective date (End): April 30, 2021
Field of knowledge:Physical Sciences and Mathematics - Geosciences - Geology
Principal researcher:Marcello Guimarães Simões
Grantee:Suzana Aparecida Matos da Silva
Home Institution: Instituto de Biociências (IBB). Universidade Estadual Paulista (UNESP). Campus de Botucatu. Botucatu , SP, Brazil


The Cretaceous (i.e., Crato and Romualdo formations) of the Araripe Basin, records some of the most spectacular fossil-rich deposits (Konservat-Largestätten) of the Mesozoic, which were generated during the Gondwana break-up and consequently South Atlantic Ocean opening. Because of that, upper units of the Santana Group (i.e., Romualdo Formation) record a main Aptian marine transgression. However, various key issues of this event (i.e., marine transgression extension and direction) are still controversial. The Romualdo Formation is characterized by a transgressive-regressive cycle bounded by two regional unconformities. In this project, the main changes in the benthic paleocommunities tied to the paleoenvironmental fluctuations, during the transgressive-regressive cycle of the Romualdo will be investigated. The project focus in an extensive quantitative paleoecologic analysis based on stratigraphically, well-constrained samples (meter by meter) precisely plotted against the available sequence stratigraphy framework of the Romualdo Formation. To determine the nature of the paleoenvironmental changes, right-resolution facies analyses as well as taphonomic and paleoecologic studies (i.e., faunistic composition, relative abundances, diversity) will be done. The main goal is to demonstrate how the paleocommunities responded to the paleoenvironmental changes tied to the seal level changes. The definition of the paleoecologic character of the Romualdo Formation benthic assemblages is an unexplored issue, which is key to our knowledge of the paleogeography and faunal correlations of the Aptian-Albian interval of the sedimentary basins of the Brazilian NE interior.

Matéria(s) publicada(s) na Revista Pesquisa FAPESP sobre a bolsa::
Por qué Crato preserva fósiles 
Why Crato uniquely preserves fossils 
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Scientific publications (5)
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
FILIPE GIOVANINI VAREJÃO; VICTOR RIBEIRO SILVA; MARIO LUIS ASSINE; LUCAS VERÍSSIMO WARREN; SUZANA APARECIDA MATOS; MARIZA GOMES RODRIGUES; FRANZ THEODOR FÜRSICH; MARCELLO GUIMARÃES SIMÕES. Marine or freshwater? Accessing the paleoenvironmental parameters of the Caldas Bed, a key marker bed in the Crato Formation (Araripe Basin, NE Brazil). BRAZILIAN JOURNAL OF GEOLOGY, v. 51, n. 1, p. -, 2021.
RODRIGUES, M. G.; MATOS, S. A.; VAREJAO, F. G.; FUERSICH, F. T.; WARREN, L. V.; ASSINE, M. L.; SIMOES, M. G. Short-lived ``Bakevelliid-Sea{''} in the Aptian Romualdo Formation, Araripe Basin, northeastern Brazil. CRETACEOUS RESEARCH, v. 115, NOV 2020. Web of Science Citations: 0.
DA SILVA, VICTOR R.; VAREJAO, FILIPE G.; MATOS, SUZANA A.; RODRIGUES, MARIZA G.; FURSICH, FRANZ T.; SKAWINA, ALEKSANDRA; SCHNEIDER, SIMON; WARREN, V, LUCAS; ASSINE, MARIO L.; SIMOES, MARCELLO G. New freshwater mussels (Bivalvia, Unionida) with potential trigonioidid and hyriid affinities from the Early Cretaceous of Brazil. GEOBIOS, v. 61, p. 41-54, AUG 2020. Web of Science Citations: 0.
DA SILVA, VICTOR R.; VAREJAO, FILIPE G.; MATOS, SUZANA A.; FUERSICH, FRANZ T.; SKAWINA, ALEKSANDRA; SCHNEIDER, SIMON; WARREN, LUCAS V.; ASSINE, MARIO L.; SIMOES, MARCELLO G. Cratonaia novaolindensis gen. et sp. nov. (Unionida, Silesunionoidea) from the Aptian of Brazil (Araripe Basin), and its implications for the early evolution of freshwater mussels. CRETACEOUS RESEARCH, v. 107, MAR 2020. Web of Science Citations: 0.
VAREJAO, F. G.; FUERSICH, F. T.; WARREN, V, L.; MATOS, S. A.; RODRIGUES, M. G.; ASSINE, M. L.; SALES, A. M. F.; SIMOES, M. G. Microbialite fields developed in a protected rocky coastline: The shallow carbonate ramp of the Aptian Romualdo Formation (Araripe Basin, NE Brazil). SEDIMENTARY GEOLOGY, v. 389, p. 103-120, JUL 1 2019. Web of Science Citations: 0.

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