Shifting Ground
Before the earthquake on June 30, 1975, the observation platform extended one hundred feet farther into the canyon. The main tremor and numerous aftershocks measuring 6.1 on the Richter scale shattered a portion of this cliff, tumbling it into the gorge.
Up and down the canyon you can see evidence of other rockfalls. This section of the Yellowstone River overlies a major fracture zone, and the park records thousands of minor tremors annually. Do not assume the scenery will be the same when you return.
Marker can be reached from Inspiration Point 0.8 miles east of Grand Loop Road.
Courtesy hmdb.org
