To it fell the honor of welcoming civilized man to this region. It was the first geyser named. It stands at the head of the basin and has been happily called “The Guardian of the Valley.”
Terry Engr. Co.
U. S. Geological Survey of the Territories.
Castle Geyser.
Geyser in action.
Crater of Old Faithful.
Upper Geyser Basin.
It is located in the center of an oblong mound, 145 by 215 feet at the base, 20 by 54 feet at the summit, and about 12 feet high. The tube, which seems to have originated in a fissure in the rock, has an inside measurement of 2 by 6 feet.
Terry Engr. Co.
U. S. Geological Survey of the Territories.