The fewness of the organic remains observed is owing to the fact that here no quarries are worked, no roads are made, and as we advance north the rank vegetation covers up everything.

The only stone buildings in the country north of the Cape colony are the church and mission houses at Kuruman.

In the walls there the fragments, with impressions of fossil leaves, have been broken through in the matrix, once a molten mass of lava.

The area which this basalt covers extends from near the Vaal River in the south, to a point some sixty miles beyond the Victoria Falls, and the average breadth is about 150 miles.

The space is at least 100,000 square miles.