Grotto Geyser - Yellowstone N.P., Wyoming
Posted by: Volcanoguy
N 44° 28.308 W 110° 50.518
12T E 512569 N 4924288
Grotto Geyser is located in the Upper Geyser Basin of Yellowstone National Park.
Waymark Code: WMDXH1
Location: Wyoming, United States
Date Posted: 03/06/2012
Views: 10
Grotto Geyser is a fountain-type geyser with an unusual 8 foot high cone covering the eruptive pond. The cone is the result of a tangled mass of logs which fell over the eruptive pond and became coated with siliceous sinter. The interval between eruptions ranges from less than an hour to about 2 days. The eruption duration ranges from 1 to 26+ hours. The longer the duration the longer the time until the next eruption.
Information sources: The Geyser Observation and Study Association (
visit link) and Yellowstone National Park.com (
visit link)
Text of sign at Grotto Geyser:
Grotto Geyser
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.