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Yet it is not restricted in any way to mountain people, actually the people of the flat land were absolutely in this process as well, as long as higher level individual and group selection was active, often even more so!
For example in Central-Eastern Europeans flat-fertile-open lands you had primarily Nordid, Mediterranid and Cromagnid, the latter often part influenced-altered in a Nordo-Mediterranid direction and always with those traits mentioned. Socially dominant, competitive forms.
Crucial is the intraspecific competition, the individual and group selection on a higher level with sufficient ressourses to keep up a higher biological standard.
Among Melanesians f.e. the largest differences are not between people living higher or lower, but living in more or less isolated, more or less favourable areas.
Those which have to live in the worst areas, often surrounded by stronger elements, show usually the worst traits, some even with various inheritable and malnutritional diseases among them, some higher level groups even refuse to breed with them, they have various inbreeding defects and inbreeding depression.
Similar to other areas of the world were we see "traditional" tribal societies, like in America among Indianids as well.
There is a chain from the most dominant group to those which are close to extinction and since this chain constantly moves, what's at the lowest end will change and there is a selective pressure in a specific direction - in the case of higher level individual and group selection, towards more progressive racial traits.
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