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Naming Old Faithful Geyser
- When
- September 18–19, 1870 (approximate)
- Where
- Upper Geyser Basin
The expedition named Old Faithful after observing its regular eruptions in the Upper Geyser Basin, noting a frequency of about 74 minutes.
The party observed the regularity of eruptions of one geyser in the Upper Geyser Basin. Based on this consistency, they decided to name it Old Faithful. This geyser was the first in the park to be named, recognized for its predictable geothermal activity. The naming is attested for the Upper Geyser Basin visit of September 18–19, 1870, not pinned to a single documented moment.
Sources
- Washburn–Langford–Doane Expedition Wikipedia, revision of 2025-09-18
- Old Faithful Wikipedia, revision of 2026-07-23
Machine-drafted from the cited Wikipedia passages and checked by a reviewing model, not by a human editor. Every passage cites the revision it was written from; dates and places follow those passages.