Calcareous nannofossils, biostratigraphy, and paleobiogeography of the Aptian/Albian Romualdo Formation in the Araripe Basin, North-Eastern Brazil by Flávia Azevedo Pedrosa Lemos, Yumi Asakura, Rogério Loureiro Antunes, Rilda Verônica Cardoso de Araripe, Ludmila Alves Cadeira do Prado, Maria Emilia Travassos Rio Tomé, David Holanda de Oliveira, Luiz Ricardo Silva Lobo do Nascimento, Christiano Ng, Alcina Magnólia Franca Barreto

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