Although all of these migrants left some type of imprint, the marks of those who are believed to have arrived first are breathtakingly faint. Aside from what Western scholars can glean from a single pair of spearpoints—a partial Folsom projectile point found near the river and a fragment of a Clovis point located by a bird-watcher on the South Rim—we know almost nothing about the roving bands of Paleo-Indians who may, according to one perspective, have been among the earliest humans to move across this region during the twilight of the Pleistocene, some eleven thousand to thirteen thousand
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