I'm not sure which phenotypical category they'd fall into. As for genetic composition, I found this document about indigenous communities in northeastern Colombia, which includes Sierra Nevada peoples. Sierra Nevada de Santa Marta is a very endemic environment in all regards. Many of the animal and vegetal species there, for instance, are not to be found anywhere else. Maybe Kogis, Arhuacos, etc. come from very distinctive backgrounds and are also endemic as a result of years of isolation. Either way, Sierra Nevada indigenous tribes are always classed as Chibcha peoples, along with Muisca, Calima, Quimbaya, Guane, Motilon, Nutabe, San Agustin culture peoples, etc.
According to the document, Arhuacos are on average 78% Native American and 21% Subsaharan-African; Chimilas are 67% NA and 29% European; Kogis are 100% Native American. Other indigenous groups like the Wayuu who live in the Guajira peninsula appear to be tri-racials, as they score even amounts of Native, European and SSA ancestry:
Sample size was as follows.
Wayuu
n= 61 samples
Chimila
n= 37
Kogi
n= 33
Arhuaco
n= 27
Also, this other document gives some insight on indigenous populations in West Colombia.
http://www.scielo.org.co/pdf/racefn/...-160-00281.pdf
Emberas and Awas seem to have remained largely untouched, too. Most of their haplogroups on both sides happen to be NA.
Kogis and Arhuacos are well integrated into the community. I saw a few of them in school and university. They were always wearing traditional clothing, though.
They adopted Western livestock and agricultural systems. One of their most known handicrafts is made out of wool. Sheep were introduced by Europeans. A large majority of them is able to communicate in Spanish. They are not that isolated. Whilst they keep much of their culture and traditions, especially Kogis, they have been in close contact with the Western world for a while now. Amazon indigenous peoples might be more isolated.
Valledupar and Santa Marta are near the Sierra Nevada mountain range.
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