the remains of the five most complete North American male early
Holocene skeletons to examine patterns of human morphology at
the earliest observable time period.... Results indicate that
early Holocene males have variable postcranial morphologies, but
all share the common trait of wide bodies. This trait, which is
retained in more recent indigenous North American groups, is
associated with adaptations to cold climates. Peoples from the
Americas exhibit wider bodies than other populations sampled
globally. This pattern suggests the common ancestral population
of all of these indigenous American groups had reduced
morphological variation in this trait. Furthermore, this
provides support for a single, possibly high latitude location
for the genetic isolation of ancestors of the human colonizers
of the Americas.