Yellowstone National Park in Park County, Wyoming — The American West (Mountains)
Still Venting After All These Years
The Grand Canyon of the Yellowstone River slices through an ancient hydrothermal basin. The basin developed in rhyolitic lava and ash that flowed into the Yellowstone Caldera about 500,000 years ago. The river carved this spectacular canyon through the hardened lava (rhyolitic rock) and welded ash (tuff). Hot areas and steam vents still exist in the canyon. They allow heat, gases, and hot water to escape from the underground Yellowstone volcano.
On cool days, puffs of steam waft from vents near the bottom of the canyon. You might also see cinnamon-colored splotches on the canyon walls. The rust spots form when iron in the rhyolite is exposed to moisture and oxygen.
* The canyon is about 20 miles (32 km) long.
* Parts of the canyon are nearly 1,200 feet (366 m) deep.
* The canyon is forever growing longer, deeper, and wider.
* Water erosion, rather than glaciation, sculpted the canyon.
* Hydrothermal features are found along faults and fractures in the canyon wall.
Erected by National Park Service.
Location. 44° 43.184′ N, 110° 29.734′ W. Marker is in Yellowstone National Park, Wyoming, in Park County. Marker is on North Rim Drive, on the right when traveling Touch for map. Marker is located in Canyon Village, on the north rim of the canyon. Marker is in this post office area: Yellowstone National Park WY 82190, United States of America.
Other nearby markers. At least 8 other markers are within walking distance of this marker. Brink of Lower Falls (about 500 feet away, measured in a direct line); Uncle Tomís Trail (approx. ľ mile away); Uncle Tomís Point (approx. 0.3 miles away); Waterfall Makers (approx. 0.4 miles away); Lookout Point (approx. 0.4 miles away); Upper Falls of the Yellowstone River (approx. 0.4 miles away); Brink of Upper Falls (approx. half a mile away); Grand View (approx. 0.6 miles away). Touch for a list and map of all markers in Yellowstone National Park.
More about this marker. A photograph of the canyon appears on the left side of the marker.
Categories. • Natural Features •
Credits. This page was last revised on June 16, 2016. This page originally submitted on September 24, 2015, by Bill Coughlin of North Arlington, New Jersey. This page has been viewed 201 times since then and 26 times this year. Photos: 1, 2, 3, 4, 5. submitted on September 24, 2015, by Bill Coughlin of North Arlington, New Jersey.