Grizzly Mountain is located in Crook County, Central

Oregon Oregon () is a U.S. state, state in the Pacific Northwest region of the Western United States. The Columbia River delineates much of Oregon's northern boundary with Washington (state), Washington, while the Snake River delineates much of it ...

near the city of

Prineville Prineville is a city in and the seat of Crook County, Oregon, United States. It was named for the first merchant located in the present location, Barney Prine. The population was 9,253 at the 2010 census. History Prineville was founded in 187 ...

. Its

summit A summit is a point on a surface that is higher in elevation than all points immediately adjacent to it. The topography, topographic terms acme, apex, peak (mountain peak), and zenith are synonymous. The term (mountain top) is generally used ...

is at . It is composed of

welded tuff Tuff is a type of rock made of volcanic ash ejected from a vent during a volcanic eruption. Following ejection and deposition, the ash is lithified into a solid rock. Rock that contains greater than 75% ash is considered tuff, while rock cont ...

and is a part of the

Crooked River caldera The Crooked River caldera is a large and ancient volcano that straddles three central Oregon counties. The diameter of the caldera is about and is notable for the welded tuff present at Gray Butte, Smith Rock, Powell Buttes, Grizzly Mountain ...

References

External links

* Mountains of Crook County, Oregon Mountains of Oregon Volcanoes of Crook County, Oregon Volcanoes of Oregon {{CrookCountyOR-geo-stub