Pisgah Crater

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Pisgah Crater
Pisgah Crater is located in California
Pisgah Crater
Pisgah Crater
Location
Coordinates 34°44′47″N 116°22′30″W / 34.7463888°N 116.375°W / 34.7463888; -116.375Coordinates: 34°44′47″N 116°22′30″W / 34.7463888°N 116.375°W / 34.7463888; -116.375
Geology
Type Cinder Cone

Pisgah Crater, or Pisgah Volcano, is a young volcanic cinder cone rising above a lava plain in the Mojave Desert, between Barstow and Needles, California in San Bernardino County, California. The volcanic peak is around 2.5 miles (4.0 km) south of historic U.S. Route 66-National Old Trails Highway and of Interstate 40, and west of the town of Ludlow.[1]

Geology[edit]

Pisgah Volcano is the youngest vent, of four cinder cones, in the Lavic Lake volcanic field. There may have been activity at this site as recent as 2,000 years ago, though more likely 20,000 to 50,000 years ago. It is too young for the commonly used potassium-argon dating technique usable on specimens over 100,000 years old. No charred organic material for radiocarbon dating has been found.

Lava at nearby and similarly active Amboy Crater is interbedded with Bristol Playa sediments at a depth of about 9 meters (30 feet) which are approximately 100,000 years old. Recent argon-argon dating reveals an age of approximately 18,000 years ± 5,000 years (~90% certainty) for the most recent flow.[1][2]

Lava flows extend 18 km (11 mi) to the west and 8 km (5.0 mi) to southeast of the cone, containing basalt primarily of the pahoehoe texture, with some a'a. The flows contain numerous lava tubes and caves. The cindercone volcano itself shows signs of oxidization prominent in the reddish/orange/brown appearance of much of the upper portions.

Geography[edit]

Currently, the crater stands 98 meters (321 feet) above the surrounding High Desert terrain, and has a base diameter of 488 meters (1,600 feet).[3] It has lost much of its original cinder cone shape to ongoing aggregate mining operations, in addition to minor natural erosion.[1]

The crater and much of the surrounding lava field are on private property. Despite this, the lava tubes in the area are a somewhat popular and easily accessible destination for caving. Historic Lavic Siding is to the east, with the Mojave National Preserve beyond.

See also[edit]

References[edit]

  1. ^ a b c "Lavic Lake". Global Volcanism Program, Smithsonian Institution. http://www.volcano.si.edu/world/volcano.cfm?vnum=1203-19-. Retrieved 2010-07-11.
  2. ^ Sylvester et al., 2002, Bulletin of the Seismological Society of America, v. 92, p. 1333-1340
  3. ^ http://www.volcano.si.edu/world/volcano.cfm?vnum=1203-19-&volpage=photos . accessed 7/11/2010

External links[edit]