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Pilot Butte (Oregon)
Pilot Butte is a cinder cone that was created from an extinct volcano located in Bend, Oregon. It is a cinder cone butte which rises nearly 500 feet (150 m) above the surrounding plains. Bend is one of six cities in the United States to have a volcano within its boundaries. The other examples are Mount Tabor in Portland, Oregon, Jackson Volcano in Jackson, Mississippi, Diamond Head in Honolulu, Glassford Hill in Prescott Valley and Pilot Knob in Austin, Texas.
The 114.22-acre (46.22-hectare) Pilot Butte State Scenic Viewpoint, presented as a gift to the State of Oregon in 1928, is a Bend icon. Pilot Butte itself is a popular hiking destination with two trails to the summit, each gaining about 490 ft (150 m) in elevation. There is also a 1.8-mile (2.9 km) trail around the base of the butte. A scenic road also winds up and around the cone. In 2018, the park was the most visited Oregon state park east of the Cascade Mountains. From the top, the entire city of Bend is visible, as well as several major Cascade peaks including Mount Bachelor, Broken Top, and the Three Sisters, located about 20 mi (32 km) to the west. Bend launches fireworks from Pilot Butte every Independence Day.
Pilot Butte is situated on U.S. Route 20 in Bend, Deschutes County, Oregon. The volcano lies north of Newberry Volcano, east of the Cascade Range, and southwest of the Ochoco Mountains.
The Geographic Names Information System database lists its summit elevation as 4,141 feet (1,262 m); the National Geodetic Survey lists its elevation as 4,142 feet (1,262 m).
Pilot Butte is a Pleistocene cinder cone volcano. It lies just outside the southeastern margin of the Crooked River caldera, which collapsed and formed volcanic fields of rhyolitic lava flows, lava domes, and dikes including Powell Buttes, Gray Butte, Grizzly Mountain, and Barnes Butte. During the late Pleistocene, eruptions at Newberry Volcano produced voluminous basalt lava flows that extended into the area now occupied by Bend and Redmond. About 78,000 years ago, similar eruptive activity formed lava flows that surrounded Pilot Butte and filled the Deschutes riverbed, altering the course of the river by redirecting it to form a new channel to the west. The interior of these lava flows can be explored at Lava River Cave.
Pilot Butte erupted basaltic andesite, which underlies other lava flows dating to the Quaternary near Bend. There are four major faults in the Bend area, which run from the northern side of Newberry Volcano to 1.2 miles (2 km) north of the point where Oregon Highway 20 and 97 meet. These faults have produced vertical surface separation of up to 39 to 66 feet (12 to 20 m) in their southern components, including displacement of 33 feet (10 m) northeast of Pilot Butte. One of the four is a normal fault that runs for 6.4 miles (10.3 km) in length with an average strike of 26° trending north–west, one of its endpoints approximately 1.9 miles (3 km) southeast of Pilot Butte. Deposits on Pilot Butte's northeastern side exhibit variable degrees of displacement, implying several distinct surface ruptures, and lava deposited by Pilot Butte has an escarpment of more than 66 feet (20 m). Pleistocene activity produced highly porphyritic lava with 10 to 15 percent plagioclase phenocrysts reaching diameters of up to 0.20 inches (5 mm). The lava is composed of 53.5 percent silica and 20 percent aluminum oxide. The volcano's lower southwest flank is covered with white, rhyolitic tephra, which is similar in composition to tephra found at Tumalo Creek; Sherrod et al. (2004) attribute the Tumalo Creek pumice to Pilot Butte. The pumice deposit at Tumalo Creek has a thickness of at least 6.6 feet (2 m) with lapilli reaching up to 0.23 feet (7 cm) in length. White lapilli have phenocrysts of plagioclase and clinopyroxene ranging from 0.039 to 0.039 inches (1 to 1 mm). Darker lapilli are mostly aphyric (lacking phenocrysts).
Pilot Butte is extinct. Its exact age is unknown, though one study dated the volcano to about 188,000 ± 42,000 years ago. The volcanic rock has normal magnetic polarity, suggesting that it was laid down after the most recent geomagnetic reversal about 780,000 years ago. The butte's light-colored soil contains some ash from the eruption of Mount Mazama (which formed Crater Lake).
The most common tree on Pilot Butte is Western juniper, which is sometimes parasitized by witches' broom mistletoe. Also abundant are sagebrush and the similar plants bitterbrush and rabbitbrush. The invasive species cheatgrass is likely the most common grass on the butte. Wildflowers that appear include sand lily, rock cress, penstemon, paintbrush, buckwheat, yarrow, blazing star, mariposa lily, lupine, and monkeyflower. Ponderosa pine and red currant can also be found. Birds and deer feed on some of the plants, and some animals use snags as shelter.
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Pilot Butte (Oregon)
Pilot Butte is a cinder cone that was created from an extinct volcano located in Bend, Oregon. It is a cinder cone butte which rises nearly 500 feet (150 m) above the surrounding plains. Bend is one of six cities in the United States to have a volcano within its boundaries. The other examples are Mount Tabor in Portland, Oregon, Jackson Volcano in Jackson, Mississippi, Diamond Head in Honolulu, Glassford Hill in Prescott Valley and Pilot Knob in Austin, Texas.
The 114.22-acre (46.22-hectare) Pilot Butte State Scenic Viewpoint, presented as a gift to the State of Oregon in 1928, is a Bend icon. Pilot Butte itself is a popular hiking destination with two trails to the summit, each gaining about 490 ft (150 m) in elevation. There is also a 1.8-mile (2.9 km) trail around the base of the butte. A scenic road also winds up and around the cone. In 2018, the park was the most visited Oregon state park east of the Cascade Mountains. From the top, the entire city of Bend is visible, as well as several major Cascade peaks including Mount Bachelor, Broken Top, and the Three Sisters, located about 20 mi (32 km) to the west. Bend launches fireworks from Pilot Butte every Independence Day.
Pilot Butte is situated on U.S. Route 20 in Bend, Deschutes County, Oregon. The volcano lies north of Newberry Volcano, east of the Cascade Range, and southwest of the Ochoco Mountains.
The Geographic Names Information System database lists its summit elevation as 4,141 feet (1,262 m); the National Geodetic Survey lists its elevation as 4,142 feet (1,262 m).
Pilot Butte is a Pleistocene cinder cone volcano. It lies just outside the southeastern margin of the Crooked River caldera, which collapsed and formed volcanic fields of rhyolitic lava flows, lava domes, and dikes including Powell Buttes, Gray Butte, Grizzly Mountain, and Barnes Butte. During the late Pleistocene, eruptions at Newberry Volcano produced voluminous basalt lava flows that extended into the area now occupied by Bend and Redmond. About 78,000 years ago, similar eruptive activity formed lava flows that surrounded Pilot Butte and filled the Deschutes riverbed, altering the course of the river by redirecting it to form a new channel to the west. The interior of these lava flows can be explored at Lava River Cave.
Pilot Butte erupted basaltic andesite, which underlies other lava flows dating to the Quaternary near Bend. There are four major faults in the Bend area, which run from the northern side of Newberry Volcano to 1.2 miles (2 km) north of the point where Oregon Highway 20 and 97 meet. These faults have produced vertical surface separation of up to 39 to 66 feet (12 to 20 m) in their southern components, including displacement of 33 feet (10 m) northeast of Pilot Butte. One of the four is a normal fault that runs for 6.4 miles (10.3 km) in length with an average strike of 26° trending north–west, one of its endpoints approximately 1.9 miles (3 km) southeast of Pilot Butte. Deposits on Pilot Butte's northeastern side exhibit variable degrees of displacement, implying several distinct surface ruptures, and lava deposited by Pilot Butte has an escarpment of more than 66 feet (20 m). Pleistocene activity produced highly porphyritic lava with 10 to 15 percent plagioclase phenocrysts reaching diameters of up to 0.20 inches (5 mm). The lava is composed of 53.5 percent silica and 20 percent aluminum oxide. The volcano's lower southwest flank is covered with white, rhyolitic tephra, which is similar in composition to tephra found at Tumalo Creek; Sherrod et al. (2004) attribute the Tumalo Creek pumice to Pilot Butte. The pumice deposit at Tumalo Creek has a thickness of at least 6.6 feet (2 m) with lapilli reaching up to 0.23 feet (7 cm) in length. White lapilli have phenocrysts of plagioclase and clinopyroxene ranging from 0.039 to 0.039 inches (1 to 1 mm). Darker lapilli are mostly aphyric (lacking phenocrysts).
Pilot Butte is extinct. Its exact age is unknown, though one study dated the volcano to about 188,000 ± 42,000 years ago. The volcanic rock has normal magnetic polarity, suggesting that it was laid down after the most recent geomagnetic reversal about 780,000 years ago. The butte's light-colored soil contains some ash from the eruption of Mount Mazama (which formed Crater Lake).
The most common tree on Pilot Butte is Western juniper, which is sometimes parasitized by witches' broom mistletoe. Also abundant are sagebrush and the similar plants bitterbrush and rabbitbrush. The invasive species cheatgrass is likely the most common grass on the butte. Wildflowers that appear include sand lily, rock cress, penstemon, paintbrush, buckwheat, yarrow, blazing star, mariposa lily, lupine, and monkeyflower. Ponderosa pine and red currant can also be found. Birds and deer feed on some of the plants, and some animals use snags as shelter.