Learn some geography. Indus valley ain't near the Altay mountains. There's a thing called the Himalayas smack in between.
"The Mongoloids of the North, with the epicanthal eye lids, flatter faces and lighter skin are descended from the Mongoloids of South East Asia."
Yeah, that sure explains why Southeast Asians don't have the epicanthal fold and Southeast Asians are much darker.
The function of the epicanthal fold is clearly cold/ice weather adaptation. The further north the Mongoloids, the stronger epicanthal folds they have.
Indian archaelogists are notorious Aryan theorists who believe the entire White Race came from India and ruled the world in prehistory. BS that's what it is.
Many of us may have our origins in Sundaland.