Botryoidal Spring Geyser is located across the road from Great Fountain Geyser in the Lower Geyser Basin of Yellowstone. In early October 1998, Botroidal Spring Geyser had an interval of 3 minutes and a duration of 20 seconds.
Botryoidal Geyser June 2001:

Botryoidal movie (1.0 Mb, 9 sec)
Botryoidal Geyser August 2000:

Botryoidal movie (1.4 Mb, 12 sec)
Images copyright 2000, 2001, Michael Frazier. All rights reserved.