Thermal features

Holes in the Earth's crust from which hot water and steam (geysers), and gases and vapors (fumaroles) are emitted. [Adapted from USGS Circ 1048 and Glossary of Geology, 4th ed.]
This category is also used for fumaroles, geysers, and hot springs.
Alexandria Digital Library Feature Type Thesaurus

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Geophysical studies of the Crump Geyser known geothermal resource area, Oregon, in 1975

Gravity map and data used to infer details of the geologic structure of the area. Surveys were conducted during or prior to 1975.