LEGACY - Northwest Rift Zone - Deschutes County, Oregon
Posted by: 
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
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.
Visit Instructions:
Include your thoughts and observations pertaining to this location and your visit. Provide any additional history that you are aware of that pertains to this location. If the marker commemorates a historic building tell us what it is used for now or share with us the circumstances of an earlier visit to bring this locations history to life.
Please upload a favorite photograph you took of the waymark. Although visiting this waymark in person is the only thing required of you to receive credit for your visit, taking the time to add this information is greatly appreciated.
Be creative.