Figure 1. (a) Map of Africa, showing the Sokoto sub-basin, Northwest Nigeria in relation to the Iullemmenden basin. Inset: Location of (b). (b) Simplified geological map of the southeastern sector marine and marginal facies of Illemmenden basin, Sokoto sub-basin (Okosun, 1997)

From

Major Oxides and Trace Elements Composition of Phosphate Bearing Sedimentary Rocks from Sokoto, Northwest Nigeria

Kolo Matthew Tikpangi, Salihu Simon Olonkwoh

American Journal of Environmental Protection. 2015, 3(4), 106-111 doi:10.12691/env-3-4-1