Biostratigraphical investigation of middle-early Miocene sediments from a section of AK-1 well, onshore Niger Delta: Insights from calcareous nanofossils. Fountain Journal of Natural and Applied Sciences, [S. l.], v. 12, n. 1, 2023. DOI: 10.53704/fujnas.v12i1.439. Disponível em: http://www.fountainjournals.com/index.php/FUJNAS/article/view/439. Acesso em: 2 apr. 2026.