Here, as on the slopes down to the Quilo and Chikapa, we had an opportunity of viewing the geological structure of the country--a capping of ferruginous conglomerate, which in many parts looks as if it had been melted, for the rounded nodules resemble masses of slag, and they have a smooth scale on the surface; but in all probability it is an aqueous deposit, for it contains water-worn pebbles of all sorts, and generally small.

Below this mass lies a pale red hardened sandstone, and beneath that a trap-like whinstone.

Lowest of all lies a coarse-grained sandstone containing a few pebbles, and, in connection with it, a white calcareous rock is occasionally met with, and so are banks of loose round quartz pebbles.
The slopes are longer from the level country above the further we go eastward, and every where we meet with circumscribed bogs on them, surrounded by clumps of straight, lofty evergreen trees, which look extremely graceful on a ground of yellowish grass.

Several of these bogs pour forth a solution of iron, which exhibits on its surface the prismatic colors.

The level plateaus between the rivers, both east and west of the Moamba, across which we traveled, were less woody than the river glens.