Prehistoric Times
In the Middle Prehistoric era, humans appear to have continued living in mountain areas through droughts severe enough for plains populations to disappear. Evidence suggests that the Yellowstone Plateau was occupied continuously, with seasonal movement among preferred places. Foragers wintered in protected valleys along the edges of the plateau, and summered in higher hunting grounds that might have extended fifty to a hundred miles away. Some of the seasonal routes developed into often-used trails. Artifacts from this era are found throughout the park, with large enough concentrations around Lake Yellowstone to suggest a substantial population.
Read more about this topic: Trails Of Yellowstone National Park
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