G. L. Fambrini, D. da C. Silvestre, A. M. Barreto Junior, and W. F. da Silva-Filho, “Stratigraphy of the Araripe Basin: state of the art, critical review, and new results”, Geol. USP. Sér. Cient., vol. 20, no. 4, pp. 169–212, Dec. 2020, doi: 10.11606/issn.2316-9095.v20-163467.