Ancient Rivers of the Pacific Northwest 

I appreciate how Nick gives credit to those that do all the research. Class act.

Here in Australian we have not one active volcano left. What an amazing geo-active history you have there on the pacific northwest. My mind spins at the time and effort it has taken to work all this geo-history out.

Thanks Professor you are proving by my rapt attention that you can teach a old dog new tricks. I find this all fascinating and look forward to pointing out all these cool geographic treasures to my grand kids.

Greetings from Sweden! I love your talks!

what a great teacher you are Prof Zentner!

Two thoughts. How does this only have 56k views? This guy shouldn’t be teaching geology he should be teaching teaching…

I've been watching this one since it was released a few years ago. One of your best lectures 👍

Nick, you are a national treasure

Thank you Nick! It's like you read my mind in re-posting these lectures! After GEOL 101, my questions are surfacing around Columbia River Basalts and Ancient Rivers.

Xlnt video. Presenter is terrific...enjoy vid thoroughly;⁠-⁠)

I love these lectures. Physical geology was my favorite subject in college. Wish you had time to do the Midwest and Texas. We drove from Oklahoma to Seattle in the 1960s. I had quite an opportunity (as a third-grader) to observe so many amazing geological features.

Fascinating lecture! I saw a lecture once by Dr. Dennis Shiozawa about cutthroat trout evolution where he claims that the ancestral Snake River was once a tributary of the Sacramento River via the Humboldt and Pit rivers until about 3 mya when Lake Idaho over spilled into what is now Hells Canyon and capturing the Snake into the Columbia. I have not seen this hypothesis discussed anywhere else though and it seems to disagree with this hypothesis that the Snake used to take a shortcut across Oregon to the lower Columbia until 3 mya.

Thanks for the Nick fix!

I've said it before and I'll say it again - you, sir, are a master communicator. You were made to do this. Keep up the good work. (Edit - just dawned on me. You've released this at a higher resolution. It shows; and it looks GREAT. but now I have to look up the older version to identify the edits. LOL)

So informative! Awesome presentation! And I decided to check Google maps to see where that that lava filled river valley was by Kahlotus, and found it on Streetview along highway 263. Amazing what technology has brought us too! More fun to actually be out there in the field and seeing it in person though.

Fantastic lecture! Second watch - I really enjoyed this one.

Yes !

It would be nice to see if there's correlating evidence in spawning River fish biology and genetics signalling markers of when each of these Rivers were running and then subsequently cut off by lava flow. Did the Lava Flow cutting off the river 2 spawning salmon change the morphology of the fish species and can be seen in DNA evidence as markers laid out with this specific point of time that each lava flow occurred?

Golden at the rivers bend

And to think this is the story of a small place compared to the rest of the planet. What an amazing place our space rock is!

Great stuff!

Very good job, Nick.

Sorry Patrick 😎

The student Mason would like this show also.

A River Runs Through It~

Teachers should all be clones of Nick Zentner.

The subsidence has begun ...wow over dry falls ..cool, the scope of this is hard to comprehend

So excellent

Ya gotta love it!!!

Today’s lesson brought to you by Emily 2

waiting for classes

fascinating

so how many millions years ago did the Columbia flow south by baker city oregon . i now know where the yellow rock come from thanks

Yay nick,!!!

It would be great if he could do the Fraser river , More so the section thru the Fraser. Valley , I am wondering if the Fraser ever we r on the Washington State side Around Sumas Washington

Where did all the sediment go from all the river flow. Did the great flood move the sediment to the south or disperse it. Is there mountains made of sediments??. some of the canions and valleys show levels of erosion line are the from lifting hills or was the water that high at one time.

I wish I had a teacher/professor with a Gram of his intensity. Don't get me wrong I had a few great teacher in grade school none like this after

I live on one side of the Rio Grande rift valley. I'm on the steep uplift side of the Eocene rift. The END of the Eocene epoch. I can see the volcanoes on the other side from my back door. I have a supervolcano to my north about 50 miles away. Would a splitting plate not cause TORQUE far to the north? I posit that the Yellowstone hotspot is a result of the Rio Grande rift and that the time between eruptions in Yellowstone has lengthened because the rift locked, preventing the North American continent from splitting.

❤

I would love to go hiking with this guy and sit around a campfire. 🤙🏼🏔️

This man just resurrected the chalk board. And, how appropriate - to use chalk...get it?

So the Columbia basin sinks not just from the weight of the lavas, but from the push between the Cascades and the Rockies, just like Puget Sound between the Olympics and the Cascades? Hmmm, makes sense now.

A couple thought trails: the spuds are deposited at the bottom of the ancient river, lava flows bury that rock and fill in the valley. Then presumably before the river digs in to the sides in the softer materials, new cobbles are then deposited on top of what will become a ridge? I'm not clear on the question of uplift happening since uplift would not put the ancient cobbles under the basalt on top of the ridge. I guess it is both erosion beside the basalt and uplift that produces the high ridges leaving the shorter period where river flowed before digging in beside the ridge to deposit the cobbles on top the ridges? Or is that from river cuts through ridges and you don't actually see the "breadcrumb trails" except at cuts? Second: uplift at the time of the ice age. Not because the lava flows that weighted it down have been washed away by erosion and not because of deep ice laying on top of the land. I'd have to suppose that continental drift is causing that uplift. That's only 3 million years ago so basically the same as today so wouldn't that have to be the Juan de Fuca plate subducting at the Cascadia subduction zone and so lifting this corner of the North American plate?

👍🇨🇦😎

Are river rocks from volcanoes?

Calling all homeschoolers

😮6th 😅😮