Chapter I · (continued 2)

Plate V

Worn Volcanic Cones near Awe.

The Wase Rock.

The plateau areas between the larger valleys are themselves much dissected, especially in the east and north, by the smaller tributary streams. In the west there are some fairly extensive stretches of continuous tableland, whose gently undulating and thinly-wooded surface is diversified by occasional flat-topped and conical hills, the relics of a former plain which has now been almost entirely removed in the course of denudation. To the north and north-east of Sokoto the irregularities of the dissected plateau are softened in contour by accumulations of blown sand which covers the floors of the smaller valleys and creeps up their lateral slopes, rounding off the steeper cliffs of the flattened ridges on either side.