I've read that early walking humans who peopled the Americas are thought to have moved roughly 10 miles per generation. This would seem to mean they traveled 10 miles along anyone of or numerous degrees of the compass. If this supposition is correct (v. 100 miles per generation), where does this figure come from? What evidence exists to support such a hypothesis, regardless of 10,20 or 100 miles per generation? This is fascinating to think about, but has relevance to my work, which is focused on the Chiricahua Apache of SE Arizona/SW New Mexico & the states of Chihuahua & Sonora, Mexico. These are the "homelands" of the Chiricahua, both "Western," "Eastern," & the "N'de N'ai," of "Old" Mexico. Obviously, humans walked the majority of the time spent covering the world. The distance from the Beringa Strait to Clovis or Folsom, NM, would be most relevant. From there to SW New Mexico, where the Chiricahua mostly settled, one could then make some rough guesses as to when those Apaches "arrived" in this part of the world.