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Boring Lava Field

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Boring Lava Field

Boring Lava Field
Bob's Mountain in Washington State
Location Oregon and Washington, U.S.
Coordinates
Highest point
 – elevation
 – coordinates
Larch Mountain[1]
4,061 feet (1,238 m)
Geology Volcanic field[2]
Age Pleistocene[2]
Last eruption > 300,000 years[2]
Locations of Boring vents in the Portland, Oregon area

The Boring Lava Field is an extinct Plio-Pleistocene volcanic field zone with at least 32 cinder cones and small shield volcanoes lying within a radius of 13 miles (21 km) of Kelly Butte, which is approximately 4 miles (6 km) east of downtown Portland, Oregon, in the United States. The name is derived from the town of Boring, Oregon, which lies just to the southeast of the most dense cluster of lava vents. The zone became active at least 2.7 million years ago, and has been extinct for about 300,000 years.[2]

The Portland metropolitan area, including suburbs, is one of the few places in the continental United States to have extinct volcanoes within a city's limits; Bend, Oregon is another; for example Pilot Butte is a 500 foot high cinder cone located within the Bend city limits.

Oregon vents

The following vents are in Oregon:

Washington vents

The following vents are in Washington:

  • Battle Ground Lake - Elevation 509 feet (155 m)[12] (miniature crater lake)
  • Bob's Mountain - Elevation 2,110 feet (643 m)[3] (contains intact summit crater)
  • Bob's Mountain (N) - Elevation 1,775 feet (541 m)[3]
  • Bob's Mountain (S) - Elevation 1,690 feet (515 m)[3]
  • Brunner Hill - Elevation 680 feet (207 m)[3] (2 vents)
  • Green Mountain - Elevation 804 feet (245 m)[3] (logged off during World War I)
  • Mount Norway - Elevation 1,111 feet (339 m)[3]
  • Mount Pleasant - Elevation 1,010 feet (308 m)[3]
  • Mount Zion - Elevation 1,465 feet (447 m)[3]
  • Nichol's Hill - Elevation 1,113 feet (339 m)[3]
  • Pohl's Hill - Elevation 1,395 feet (425 m)[3]
  • Prune Hill (W) - Elevation 555 feet (169 m)[3]
  • Prune Hill (E) - Elevation 610 feet (186 m)[3] (overlooks Camas, Washington)
The buttes of the Boring Lava Field are visible toward the center of this panorama of Portland, Oregon

References

  1. ^ a b
  2. ^ a b c d
  3. ^ a b c d e f g h i j k l m n o p q r
  4. ^ a b c
  5. ^
  6. ^
  7. ^
  8. ^
  9. ^
  10. ^
  11. ^
  12. ^

External links

  • USGS Map of Boring Lava Field
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