Pine Mountain (Oregon)

Pine Mountain is a rhyolitic mountain east of Bend and south of U.S. Route 20 (US 20) in eastern Deschutes County, Oregon, United States.[3] It is the site of an astronomical observatory called the Pine Mountain Observatory.[4] The mountain is a part of the Deschutes Formation (which is related to Cascade volcanism) and is the southeasternmost exposure of the formation and is of similar age to Cline Buttes.[2]

Pine Mountain
Highest point
Elevation6,509 feet (1,984 m)[1]
Coordinates43°48′11″N 120°54′48″W[1] 
Geography
LocationDeschutes, Oregon, U.S.
Topo mapUSGS Pine Mountain
Geology
Age of rock6.25 Ma[2]
Mountain typePyroclastic cone

Geology

Pine Mountain shows considerable erosion and is covered with thick soil deposits.[3] The mountain consists of basalt, rhyolite, andesite and dacite.[5][6] Dunes mark the northwest flank of the mountain, consisting of pumiceous dust and lapilli.[7]

History

On September 17, 1984 a large fireball was seen from the Pine Mountain Observatory heading northeasterly before breaking into six orange fragments.[8]

gollark: Oh, sure, fights with people who actually want to participate in them would be okay.
gollark: You still run into externalities like, er, carbon dioxide.
gollark: Ideally we'd be able to partition Earth into... lots of... different areas, set up different governments in each with people who like each one in them, magically fix externalities between them and stop them going to war or something, somehow deal with the issue of ensuring children in each society have a reasonable choice of where to go, and allowing people to be exiled to some other society in lieu of punishment there - assuming other ones will take them, obviously. But that is impractical.
gollark: The reason I support *some* land-value-taxish thing is that nobody creates land, so reward from it should probably go to everyone.
gollark: The only big problem I can see with that is that you can't really have the property/developed stuff on that land separate from the land itself, at least with current technology and use of nonmovable stuff.

References
  1. "Pine Mountain". Geographic Names Information System. United States Geological Survey. Retrieved February 13, 2018.
  2. Ford, Mark T; Grunder, Anita L; Duncan, Robert A (2013). "Bimodal volcanism of the High Lava Plains and Northwestern Basin and Range of Oregon: Distribution and tectonic implications of age-progressive rhyolites". Geochemistry, Geophysics, Geosystems. 14 (8): 2836–57. doi:10.1002/ggge.20175.
  3. "Geology and Mineral Resources of Deschutes County, Oregon" (PDF). OregonGeology.org. Retrieved 2018-01-04.
  4. "Pine Mountain Observatory". PMO.UOREGON.EDU. Retrieved 2018-01-04.
  5. Higgins, Michael W.; Waters, Aaron C. (March 1967). "Newberry Caldera, Oregon: A Preliminary Report". The Ore Bin. 29 (3): 37–60. CiteSeerX 10.1.1.614.3401.
  6. "Newberry Volcano, Oregon: A Cascade Range geothermal prospect" (PDF). OregonGeology.org. Retrieved 2018-01-04.
  7. "Preliminary Report on the Geology and Water Resources of Central Oregon" (PDF). PUBS.USGS.GOV. Retrieved 2018-01-04.
  8. "Large fireball sighted in Pacific Northwest: More information needed" (PDF). OregonGeology.org. Retrieved 2018-01-04.


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