PointofInterestRoadSigns.com - Yellowstone National Park - Grotto Geyser


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Yellowstone National Park - Grotto Geyser


Location of sign - Upper Geyser Basin near Old Faithful in Yellowstone National Park


Photo taken June 2008

Grotto Geyser, Grotto Geyser sign, Upper Geyser Basin Yellowstone National Park  

Close-up view of sign


Grotto Geyser, Grotto Geyser sign, Upper Geyser Basin Yellowstone National Park

Wide view of sign


Text of sign:


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 fifty minutes to more than 24 hours.

The unusually shaped cone of Grotto Geyser has long captured the imagination of explorers, artists, and visitors.  This woodcut

illustration was developed for Nathaniel P. Langford's second article on Yellowstone in Scribner's magazine in June, 1871.


This exhibit made possible by a generous grant from the Yellowstone Association.


Graphics on the sign


In addition to the text there is a picture of Grotto Geyser erupting and a picture of a woodcut illustration from Scribner's Magazine

of Grotto Geyser from 1871.


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