The Grand Canyon of the Yellowstone
The canyon varies from 800 to 1200 feet in depth
and from 1500 to 4000 feet in width. Its length is about 24 miles. The upper 2½ miles is the most colorful section. Hot spring activity has continued through the ages altering the lava rock to produce lovely colors which are largely due to varied iron compounds. Have you noticed that stream vents and geysers are still at work on the canyon walls?
Marker is on South Rim Road east of Grand Loop Road.
Courtesy hmdb.org
