Basutoland is entirely occupied by the upper division (Stormberg series) of the Karroo formation.
In this part of its course the river receives from the south the streams, often intermittent, which rise on the northern slopes of the Stormberg, Zuurberg and Sneeuwberg ranges - the mountain chain which forms the water-parting between the coast and inland drainage systems of South Africa.
Of these southern rivers the chief are the Kraai, which joins the Orange near Aliwal North, the Stormberg and the Zeekoe (Sea Cow), the last named having a length of 120 m.
On the 10th of December Gatacre essayed a night march and attack upon the enemy's position at Stormberg, and, misled by his guides in unknown ground, was himself surprised and forced to return with a loss of 719.
Of the Karroo System all the groups from the basal Dwyka Conglomerate to the Cave Sandstone of the Stormberg series (see Cape Colony) are represented; but these rocks have not been so minutely subdivided as in the Cape.
The Beaufort series occupies a portion of the area formerly regarded as being composed of the Stormberg beds.
The Stormberg series is confined to the north-east.'
Africa during the Cretaceous period (after the deposition of the Stormberg beds), and drilled these enormous craters through all the later formations.