Durations range from minutes to hours. Spasmodic is in eruption about one third of the time. Spasmodic is active during both the Sawmill Mode and the Penta-Churn Mode . In either case, Spasmodic usually precedes these other geysers. Like Sawmill, it is a fountain-type geyser, its bursting eruptions playing through a funnel shaped pool.
Typical intervals range from minutes to hours.
When in the Sawmill Mode , durations are usually measured in minutes but in the Penta-Churn Mode the may last hours. The name Tardy has been moved around a bit during the history of the park. It started on the current feature but at various times in the early history of the park was moved to what are now Turban Geyser and Old Tardy Geyser . The vent of Uncertain Geyser lies nearly hidden in the low sinter mound behind Sawmill Geyser. If you don't know where the small round vent is located, it can be hard to see.