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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 and Barnes Butte Barnes Butte is a rhyolite dome of volcanic rock in Crook County, Oregon, United States located partly within the city of Prineville. Barnes Butte is composed of welded tuff and is a part of the Crooked River caldera. It was the site of a 19 .... The volcano is considered extinct and last erupted about 29.5 Ma. References {{reflist Calderas of Oregon Landforms of Jefferson County, Oregon Volcanoes of Crook County, Oregon Volcanoes of Deschutes County, Oregon Volcanoes of Oregon Oligocene calderas ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Deschutes County, Oregon
Deschutes County is one of the 36 counties in the U.S. state of Oregon. As of the 2020 census, the population was 198,253. The county seat is Bend. The county was created in 1916 out of part of Crook County and was named for the Deschutes River, which itself was named by French-Canadian trappers of the early 19th century. It is the political and economic hub of Central Oregon. Deschutes comprises the Bend, Oregon Metropolitan Statistical Area. Deschutes is Oregon’s fastest-growing and most recently-formed county. History French-Canadian fur trappers of the Hudson's Bay Company gave the name Rivière des Chutes (River of the Falls) to the Deschutes River, from which the county derived its name. On December 13, 1916, Deschutes County was created from the southern part of Crook County. Bend has been the county seat since the county's formation. It was the last county in Oregon to be established. The Shevlin-Hixon Lumber Company also operated within the Bend area proces ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Powell Buttes
The Powell Buttes are mountains with several summits located in Crook County, Oregon, United States. The highest summit is over . The mountains are geologically related to the Ochoco Mountains and are named after members of Joseph Powell's family. Geology The Powell Buttes are five rhyolitic buttes in western Crook County in Central Oregon. One of the buttes is considerably larger than the rest. Hat Rock is one of the named summits. In addition to the rhyolite, tuff and diatomite also comprise the buttes. Welded tuff has been found, showing it once comprised the Crooked River caldera. The buttes are morphologically related to the Ochoco Mountains. Low grade uranium was found in very small amounts along the western side of one of the smaller buttes. Environment and ecology In the summer, the environment around the Powell Buttes is dry and warm during the day and cool at night. In the winter, the weather is cold with snow occurring from October through April. Weste ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Volcanoes Of Deschutes County, Oregon
A volcano is a rupture in the crust of a planetary-mass object, such as Earth, that allows hot lava, volcanic ash, and gases to escape from a magma chamber below the surface. On Earth, volcanoes are most often found where tectonic plates are diverging or converging, and most are found underwater. For example, a mid-ocean ridge, such as the Mid-Atlantic Ridge, has volcanoes caused by divergent tectonic plates whereas the Pacific Ring of Fire has volcanoes caused by convergent tectonic plates. Volcanoes can also form where there is stretching and thinning of the crust's plates, such as in the East African Rift and the Wells Gray-Clearwater volcanic field and Rio Grande rift in North America. Volcanism away from plate boundaries has been postulated to arise from upwelling diapirs from the core–mantle boundary, deep in the Earth. This results in hotspot volcanism, of which the Hawaiian hotspot is an example. Volcanoes are usually not created where two tectonic plates slide pa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Volcanoes Of Crook County, Oregon
A volcano is a rupture in the crust of a planetary-mass object, such as Earth, that allows hot lava, volcanic ash, and gases to escape from a magma chamber below the surface. On Earth, volcanoes are most often found where tectonic plates are diverging or converging, and most are found underwater. For example, a mid-ocean ridge, such as the Mid-Atlantic Ridge, has volcanoes caused by divergent tectonic plates whereas the Pacific Ring of Fire has volcanoes caused by convergent tectonic plates. Volcanoes can also form where there is stretching and thinning of the crust's plates, such as in the East African Rift and the Wells Gray-Clearwater volcanic field and Rio Grande rift in North America. Volcanism away from plate boundaries has been postulated to arise from upwelling diapirs from the core–mantle boundary, deep in the Earth. This results in hotspot volcanism, of which the Hawaiian hotspot is an example. Volcanoes are usually not created where two tectonic plates slide pa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Landforms Of Jefferson County, Oregon
A landform is a natural or anthropogenic land feature on the solid surface of the Earth or other planetary body. Landforms together make up a given terrain, and their arrangement in the landscape is known as topography. Landforms include hills, mountains, canyons, and valleys, as well as shoreline features such as bays, peninsulas, and seas, including submerged features such as mid-ocean ridges, volcanoes, and the great ocean basins. Physical characteristics Landforms are categorized by characteristic physical attributes such as elevation, slope, orientation, stratification, rock exposure and soil type. Gross physical features or landforms include intuitive elements such as berms, mounds, hills, ridges, cliffs, valleys, rivers, peninsulas, volcanoes, and numerous other structural and size-scaled (e.g. ponds vs. lakes, hills vs. mountains) elements including various kinds of inland and oceanic waterbodies and sub-surface features. Mountains, hills, plateaux, and plains are t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Calderas Of Oregon
A caldera ( ) is a large cauldron-like hollow that forms shortly after the emptying of a magma chamber in a volcano eruption. When large volumes of magma are erupted over a short time, structural support for the rock above the magma chamber is gone. The ground surface then collapses into the emptied or partially emptied magma chamber, leaving a large depression at the surface (from one to dozens of kilometers in diameter). Although sometimes described as a crater, the feature is actually a type of sinkhole, as it is formed through subsidence and collapse rather than an explosion or impact. Compared to the thousands of volcanic eruptions that occur each century, the formation of a caldera is a rare event, occurring only a few times per century. Only seven caldera-forming collapses are known to have occurred between 1911 and 2016. More recently, a caldera collapse occurred at Kīlauea, Hawaii in 2018. Etymology The term ''caldera'' comes from Spanish ', and Latin ', meaning "coo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Barnes Butte
Barnes Butte is a rhyolite dome of volcanic rock in Crook County, Oregon, United States located partly within the city of Prineville. Barnes Butte is composed of welded tuff and is a part of the Crooked River caldera. It was the site of a 1940s mercury mine. In 2015, a BLM BLM most commonly refers to: * Black Lives Matter, an international anti-racism movement and organization * Bureau of Land Management, a U.S. federal government agency BLM may also refer to: Organizations * BLM (law firm), United Kingdom and ... cleanup of mercury was done to reduce the health risk to residents of nearby IronHorse neighborhood and the Barnes Butte Elementary School. The butte is a recreational area and includes the IronHorse hiking trail, a loop that includes a hike to the summit. The butte is considered one of three popular landmarks near Prineville and has been set aside for scenic preservation. References Buttes of Oregon Landforms of Crook County, Oregon Mountains ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Grizzly Mountain (Crook County, Oregon)
Grizzly Mountain is located in Crook County, Central Oregon near the city of Prineville. Its summit is at . It is composed of welded tuff 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 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Smith Rock State Park
Smith Rock State Park is a state park located in central Oregon's High Desert near the communities of Redmond and Terrebonne. The day-use area of the park is open daily from dawn to dusk. The park also has a camping area as well that accommodates tent camping only. Its sheer cliffs of tuff and basalt are ideal for rock climbing of all difficulty levels. Smith Rock is generally considered the birthplace of modern American sport climbing, and is host to cutting-edge climbing routes. It is popular for sport climbing, traditional climbing, multi-pitch climbing, and bouldering. History The origin of the Smith Rock name is uncertain. One story, published the Albany ''States Rights Democrat'' in 1867, states that Smith Rock was named after John Smith, who was Linn County Sheriff and an Oregon state legislator in the 1850s and 1860s. The newspaper article credits Smith with "discovering" the rock. Another story claims the rock was named after a soldier named Smith who fell to hi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Crook County, Oregon
Crook County is one of the List of counties in Oregon, 36 counties in the U.S. state of Oregon. As of the 2020 United States census, 2020 census, the population was 24,738. The county seat is Prineville, Oregon, Prineville. The county Oregon Geographic Names, is named after George Crook, a U.S. Army officer who served in the American Civil War and various Indian Wars. Crook County comprises the Prineville, OR Micropolitan Statistical Area, which is included in the Bend, Oregon, Bend--Prineville, OR Bend-Prineville, OR Combined Statistical Area, Combined Statistical Area. History Crook County was established on October 9, 1882, by an act of the Oregon State Legislature.Hubert Howe Bancroft, ''The Works of Hubert Howe Bancroft: Volume XXX: History of Oregon: Volume II, 1848-1888.'' San Francisco, CA: The History Company, 1888; pg. 710. The county was named after General George Crook, a veteran of various battles against the indigenous peoples of Eastern Oregon in the middle of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gray Butte
Gray Butte is a volcanic butte in the southeast corner of Jefferson County, Oregon, United States. It is composed of welded tuff and is a part of the Crooked River caldera. A recreation trail for hiking, horseback riding, and mountain biking Mountain biking is a sport of riding bicycles off-road, often over rough terrain, usually using specially designed mountain bikes. Mountain bikes share similarities with other bikes but incorporate features designed to enhance durability and pe ... leads up the side of the butte. The butte is located near the popular tourist site of Smith Rock. References Buttes of Oregon Landforms of Jefferson County, Oregon Mountains of Oregon Volcanoes of Oregon Volcanoes of the United States {{US-geology-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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 containing 25% to 75% ash is described as tuffaceous (for example, ''tuffaceous sandstone''). Tuff composed of sandy volcanic material can be referred to as volcanic sandstone. Tuff is a relatively soft rock, so it has been used for construction since ancient times. Because it is common in Italy, the Romans used it often for construction. The Rapa Nui people used it to make most of the ''moai'' statues on Easter Island. Tuff can be classified as either igneous or sedimentary rock. It is usually studied in the context of igneous petrology, although it is sometimes described using sedimentological terms. Tuff is often erroneously called tufa in guidebooks and in television programmes. Volcanic ash The material that is expelled in a volcanic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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