The cortices are nearly symmetrical in thickness (Fig. 4b), depicting the outer shape of the nucleus in the internal cortex, but tending to be subspherical to spherical and of a diameter between 2 mm and 13 mm. The pisolites are usually floating in ferruginous mud representing _70% of the sample in some lenses such as in Al-Agharri and Mulussa localities. Radial and concentric cracks are common in these pisolites (Fig. 4c).