Yankari National Park - Geology

Geology

The whole park lies on the Kerri formation, of Tertiary age, which is composed of sandstone, silt stones, kaolinites and grits. Underneath this lies the Gombe formation, of Cretaceous age, composed of sandstones, silt stones, and ironstones. The valleys of the Gaji, Yashi and Yuli Rivers are filled with Alluvium of more recent age. Sandy loans and clayey soils of riverine alluvium occur in the valley of the Gaji Yashi and Yuli Rivers. East of the Gaji valley is a 5–7 km wide band of very poor sandy soils that support a shrub savanna formation