Nick Zentner (CWU Geology) and I are working on a series of short videos with focus on geology along Interstate 90 between Seattle and Spokane. Below you'll find the first episode.
Hope you enjoy the video! Click arrow above to play.
If you drive I-90 between Seattle and Spokane ... Maybe you've wondered about the white layer in the exposed bank just east of Kittitas, WA.
Mazama Ash layer exposed east of Kittitas, WA - along Interstate 90.
Ash deposited here is 300 miles from a very famous source:
Crater Lake National Park!!!
Crater Lake fills caldera of destroyed volcano - Mount Mazama.
Must have been one heck of an explosion 7,700 years ago!!!
Ballpark ash distribution map - Mazama and 1980 Mount St. Helens.
Mount St. Helens eruption 1980 - USGS
1980 Mount St. Helens ash layer between Ellensburg and Vantage.
Mazama layer in ocean core samples helping to date big earthquakes.
Chris Goldfinger's Pacific core sample work: Discoveries Beneath the Sea.
Mazama Ash layer above Snake River in Hells Canyon
The Mazama exposure featured in our video has been verified by the USGS. The ash layer in this photo taken near Pittsburg Landing is identified in several guidebooks as Mazama.
Photos from Hells Canyon Hike
Missoula Flood deposits sit on top of 15,400-year-old Mount St. Helens ash layer.
Richard Waitt USGS - Interview
Advance to 18 minute mark in video to hear Richard describe how Cascade ash layers helped him understand Ice Age Flood rhythmites in the Columbia Basin and realize that at least 40 huge Ice Age Floods swept through the Channeled Scablands and filled the Pasco Basin.
Tom Foster, Tom Tabbert and Nick Zentner
Tabbert helps us out with with aerial footage. Thanks Tom!
Nick Zentner and Mazama Ash layer.