Oregon’s Mount Mazama erupted violently some 7,700 years ago, leaving an impressive crater (Crater Lake) where the mountain once rose high into the sky.
A blanket of volcanic ash from the eruption has become a well-known time marker for geologists throughout the Pacific Northwest.
This 3-minute video features a site right next to heavily-traveled Interstate 90 in central Washington in Johnson Canyon where the famous ash is exposed.
That’s 300 miles away from Crater Lake!
The Mount Mazama ash traveled much farther than that; far north into Canada, south into California, and east into Idaho, Wyoming, Montana, Utah, and Nevada.
The Mazama ash also traveled west, and is found on the floor of the Pacific Ocean.
Tom Foster (http://HUGEfloods.com) and Nick Zentner have been hiking together in eastern Washington for years. ‘Mazama Ash’ is part of an “I-90 Rocks” geology video series.
Nick Zentner is the science outreach and education coordinator for the Department of Geological Sciences at Central Washington University. He has produced more than 40 short videos about Central Washington geology.
This video was originally published on Dec 15, 2014.