He has shown that among those peoples bifurcate merging systems tended to get transformed either into bifurcate collateral, or generational ones. On the other hand, the lineal kinship terminology developed either from bifurcate collateral ones (this development is most typical for Eurasia), or from generational systems.
He demonstrated that among those groups, bifurcate merging systems tended to transform either into bifurcate collateral or generational ones. On the other hand, lineal kinship terminology developed either from bifurcate collateral systems (this development is most typical for Eurasia), or from generational systems.