The Trachyte Hills (not formally part of the Pavilion Range, but adjoining the Clear and Marble Ranges on their east)
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As the southern groups of Bantu speakers migrated southwards two main groups emerged, the Nguni (Xhosa, Zulu, Ndebele, Swazi), who occupied the eastern coastal plains, and the Sotho–Tswana who lived on the interior plateau.
It lies on the terminal moraine for the Okanogan lobe of the Cordilleran Ice Sheet, which flowed southward through the Okanogan trough from the Interior Plateau of British Columbia blocking the course of the Columbia River and ending on the elevations of the Waterville Plateau.