LEGACY - Northwest Rift Zone - Deschutes County, Oregon
Posted by: Groundspeak Premium Member Volcanoguy
N 43° 55.003 W 121° 21.358
10T E 631993 N 4863936
FORMER: Geology sign on crater rim trail.
Waymark Code: WM3Y0M
Location: Oregon, United States
Date Posted: 06/02/2008
Published By:Groundspeak Premium Member TheBeanTeam
Views: 16

Geology sign on crater rim trail.

Marker Name: Northwest Rift Zone
Marker Text: The Northwest flank of Newberry Volcano is cut by a system of northwest trending fissures (cracks). Fissures have been traced nearly 17 miles from East Lake in Newberry Crater northwestward across Green Mountain. These fissures have acted as a zone of weakness along which molten rock (magma) reached the surface. About 6,200 years ago several eruptive periods formed the cinder cones, spatter cones, and lava flows shown on the map. Across U.S. Highway 97 you can see a fault scarp and cinder cones which are part of the fissure system.

NOTE - The date of about 6,200 is a C14 date. Since these signs were originally done it has become possible to calibrate C14 to calendar dates. Today the commonly used age in scientific publications for eruptions along the NW Rift Zone is 7,000 calendar years.

Historic Topic: Geological

Group Responsible for placement: Forest Service

Marker Type: Trail

Region: Central Oregon

County: Deschutes

State of Oregon Historical Marker "Beaver Board": Not listed

Web link to additional information: Not listed

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Recent Visits/Logs:
Date Logged Log User Rating  
pdxmickey visited LEGACY - Northwest Rift Zone - Deschutes County, Oregon 07/26/2008 pdxmickey visited it
Volcanoguy visited LEGACY - Northwest Rift Zone - Deschutes County, Oregon 06/03/2008 Volcanoguy visited it

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