Photo exhibit shows Yellowstone changes over 140 years

CHEYENNE, Wyo. (AP) — Boulders shift, canyons erode, old trees fall, new ones grow and tourists crowd Yellowstone National Park, the length of their vacations barely any time at all in the stream of history.
A century and a-half is nothing in the eons of often violent geology that made Yellowstone. Even so, an exhausting project by a Jackson photographer shows how an ecosystem protected for that long can change in ways obvious and subtle.
Brad Boner visited dozens of sites in the park phot