“GEOCHEMISTRY OF THE UPPER CRETACEOUS SHALES FROM GOMBE FORMATION, GONGOLA BASIN, UPPER BENUE TROUGH, NIGERIA: IMPLICATIONS FOR PROVENANCE AND TECTONIC EVOLUTION”. FUDMA JOURNAL OF SCIENCES 8, no. 6 (December 31, 2024): 528–538. Accessed September 5, 2025. https://fjs.fudutsinma.edu.ng/index.php/fjs/article/view/3013.