Mammoth in Yellowstone National Park in Park County, Wyoming — The American West (Mountains)
Grotto Geyser
Photographed By Bill Coughlin, July 31, 2015
1. Grotto Geyser Marker
Grotto is perhaps the most unusual of Yellowstone’s geysers. Geologists believe that hundreds (or thousands) of years ago, Grotto Geyser emerged in a stand of dead or dying trees and, through time, deposited layer upon layer of siliceous sinter (silica) over the stumps and branches.
Fast Facts:
• Grotto’s initial eruption can reach heights of more than 40 feet, but then generally subsides to about 15 feet.
• The duration of Grotto’s eruption can vary from about 50 minutes to more than 24 hours.
Erected by National Park Service.
Topics. This historical marker is listed in this topic list: Natural Features.
Location. 44° 28.306′ N, 110° 50.518′ W. Marker is in Yellowstone National Park, Wyoming, in Park County. It is in Mammoth. Marker can be reached from Lower Grand Loop Road (U.S. 287), on the left when traveling south. Marker is located in the Upper Geyser Basin in Yellowstone National Park. Touch for map. Marker is in this post office area: Yellowstone National Park WY 82190, United States of America. Touch for directions.
Other nearby markers. At least 8 other markers are within walking distance of this marker. Giant Geyser (about 500 feet away, measured in a direct line); Riverside Geyser (about 600 feet away); Daisy Geyser (approx. 0.2 miles away); Fading Glory
this page online
More about this marker. A map of the area appears on the marker, showing the locations of the marker as well as Daisy Geyser, Comet Geyser, Brilliant Pool, Splendid Geyser, Bonita Pool, Radiator Geyser and Bank Geyser.
Photographed By Bill Coughlin, July 31, 2015
2. Grotto Geyser Marker
Photographed By Bill Coughlin, July 31, 2015
3. Grotto Geyser Marker
Photographed By Bill Coughlin, July 31, 2015
4. Grotto Geyser
Credits. This page was last revised on February 16, 2023. It was originally submitted on September 9, 2015, by Bill Coughlin of Woodland Park, New Jersey. This page has been viewed 299 times since then and 11 times this year. Last updated on September 10, 2015, by Steve Masler of Memphis, Tennessee. Photos: 1, 2, 3, 4. submitted on September 9, 2015, by Bill Coughlin of Woodland Park, New Jersey. • Andrew Ruppenstein was the editor who published this page.
