Lahars - Volcanic Mudflows

Volcanic Mudflows known as lahars are prominent near Interstate 90 at Thorp, Washington. Mount Rainier produced the famous Oceola Mudflow - 5,600 years ago - that flowed as far north as Seattle. But the white cliffs near Thorp are 10 million-year-old lahars from an extinct volcano that once stood in the William O. Douglas Wilderness west of Yakima, Washington.
The Cascade Range in Washington State has a rich history of volcanic eruptions going back 40 million years. Today’s stratovolcanoes like Mount Saint Helens, Mount Rainier, and Mount Hood are very young volcanoes - less than a million years old. But volcanic mudflow deposits like those featured in this video are much older than our current composite cones. The deposits have long outlived their source.
Tom Foster (HUGEfloods.com) and Nick Zentner (Central Washington University) have been hiking together in eastern Washington for years. ‘Lahars at Thorp’ is part of an “I-90 Rocks” video series.

[@geoffreylee5199]

Nick, as I view your short programmes, it is as if auditing your courses. Please continue, and thanks.

[@Ellensburg44]

Thanks Geoffrey. All of my stuff is at nickzentner.com if interested.

[@kylea.1223]

Washington is a beautiful state and I'm happy I live here. I went to Spokane a week ago and was struck with awe as I viewed the grand coulee along Highway 2. I haven't seen many land forms like this back in my home state of California.

[@Ellensburg44]

Yes, Tony Squared, much to appreciate here in Washington. Thanks for watching.

[@orodent]

i love watching your videos!

[@Ellensburg44]

Thanks!

[@brento2890]

Wow! Thank you very much! It’s amazing how much most people do not yet, or ever, will know. That’s why, in this awesome age of technology we can view and share these breathtaking discoveries (really, these “discoveries” are found through Research) with millions of people!!! I’ve been so inspired by past videos, I’m actually taking a Geology class in college right now. I love it. Thank you Sir !!!! - posting from Orange County, California

[@Ellensburg44]

Nice! Thanks for the comment, Brent. I hope you're enjoying your class.

[@bigwheelsturning]

Now I know what those white rocks are when I ride by again. Thanks.

[@tonymccl]

Nick, another great video. Keep up the good work!!
But I do kinda miss the bow-tie.

[@Ellensburg44]

Thanks. Me too!

[@davidelliott7746]

What clues provide an estimate of velocity of a Lahar? Is it the size and type of material the Lahar transports?

[@CubeRepublic]

Interesting thankyou

[@Ellensburg44]

Glad you liked it!

[@stevenrey56]

I love these films, thank you.

[@Ellensburg44]

Thanks for watching, Steve.

[@garynorris4648]

Superb

[@Ellensburg44]

Thanks Gary.

[@Jason1975ism]

Found a lahar outside Klamath Falls, Oregon. Pliocene age. On top is a beautiful pink ash, then cinder, then agglomerate, then basalt, and finally the "Blanket of Rocks". A Mystery! Well worn exotic cobbles and gravel, cross bedded with sand, all in neat sequences. They end abruptly with a strata of loess before more ash and lava. A landscape reforming? An ephemeral lake? Why cross bedded? Newly hatching drainage?

[@Jasper-iu3pv]

Really interesting channel. You go to all this length to make a video for CZcams?

[@Ellensburg44]

+Jasper
Thanks. Fun to make these.

[@suhrim6666]

aaaaaaaand.... Subscribed!

[@Ellensburg44]

Thank you.

[@suhrim6666]

Nick Zentner. Some of us are no longer in school, but we still crave knowledge. please consider making more videos.

[@Ellensburg44]

Plenty at nickzentner.com and thanks for the comment.

[@mikekoch4151]

West of Naches on Highway 12 there are white and pinkish layers on the foothills a few miles north of the highway. Do they have a similar origin as the ash layers at Thorp?

[@Ellensburg44]

Yes sir!

[@kabulkajate771]

Sir actually where LAHAR word came from? or this word Used in some nation/area

[@randysenn4575]

Was the extinct volcano that caused the Lahar that flowed into the Kittitas valley from an extinct volcano near White Pass now part of the Goat Rocks Wilderness area?

[@Ellensburg44]

Randy Senn Geologist Paul Hammond found the old volcano in the William O Douglas area, not the Goat Rocks. Tom's map at the 3:50 mark shows the exact location near Bumping Lake. Thanks for the question, Randy.

[@patrickkelly5009]

The extinct volcano in question is "Spiral Butte" just NE of White Pass ski area and can be found here
www.google.com/maps/place/White+Pass/@46.649725,-121.344628,2766a,35y,38.61t/data=!3m1!1e3!4m5!3m4!1s0x54973b0f0c0e8fed:0x4ac00883216b6581!8m2!3d46.6387257!4d-121.3895281?hl=en

[@jeanyvesangers3885]

12 11 21