Ancient Rivers of the Pacific Northwest

[@ronm2970]

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

[@paulcaine2603]

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.

[@jurban3a]

But you may see old ones in the Southwest from when you split from a WARM-ish Antarctica. Gibson Desert. All that red and orange is volcanic iron. It's just rust. Look at Ayers Rock from space on Google Earth. That is serious tectonics. Think of that force!

[@paulcaine2603]

@@jurban3a Yes, It's though the last erupting was about 7000 year ago. Still within the cultural memory of the first people living around that area. The red earth/soils go back before life on earth was possible due to Earths very sulfuric atmosphere. Acid rain dissolved the mineral irons to form a lot of these red mineral rich landscapes. Off course this would have been happening worldwide not just in Australia. What is unique is some of these landscapes have never been inundated by salt water oceans since.

[@jurban3a]

@@paulcaine2603 Until you get oxygen in the atmosphere, you won't get rust. I still want to see stromatolites. They seem under-appreciated.

[@mmiller73]

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.

[@kidmohair8151]

what a great teacher you are Prof Zentner!

[@Swede_4_DragonBeliever]

Greetings from Sweden! I love your talks!

[@TheRiehlThing42]

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.

[@GB-ew8wc]

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.

[@darylb5564]

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

[@lindataylor1127]

Nick, you are a national treasure

[@lisareed5669]

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.

[@steve2ish]

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

[@amommamust]

Thanks for the Nick fix!

[@lindaorr1805]

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

[@lindsaymalone9371]

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.

[@mikelevitz1266]

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

[@scottbogfoot]

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?

[@koof1776]

A River Runs Through It~

[@jenniferlevine5406]

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

[@jurban3a]

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.

[@christophersmith8316]

I believe the theory is that hotspots like Yellowstone are features of the mantle and not the continent. North America has been 'running over' the hotspot for about 80 million years - it was off the west coast, then at the coast, then moving in and scarring the land to its current location. Assuming drift stays the same for long enough it would cut a scar all the way across the continent to the east coast.

[@eduardos.366]

Very good job, Nick.

[@toddp5026]

A wind gap is an excellent name for that geological feature, wind gaps for some reason fascinate me the most. I would love to see a wind gap in person.

[@BremnerLance]

That was an awesome video. I immediately looked at maps for coulee city and zooming out the terrain and the lake made sense. It was the Columbia

[@aditichoudhary4722]

waiting for classes

[@alm6810]

Golden at the rivers bend

[@cahenglish]

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)

[@EmilioExploring]

Great stuff!

[@anthonygreene6456]

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!

[@steel1182]

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

[@Widespreadeye]

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

[@brentreed6462]

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.

[@squamishfish]

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

[@chucklowry1622]

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

[@dando100]

Teachers should all be clones of Nick Zentner.

[@Vagabond820]

All students would definitely know their geology.

[@heatherthrone9999]

Nothing beats someone doing what they LOVE

[@debbierhode6291]

I am rewatching this after 2 years...Professor Zentner has us coming back for more lol!

[@stevenlester2606]

The student Mason would like this show also.

[@xojewel1]

I think Mason is in the audience. Front row no doubt.

[@tottiemitchell6737]

Are river rocks from volcanoes?

[@tottiemitchell6737]

Lava-Filled...I get it now.

[@darkydoors1030]

So excellent

[@YellowCatBooks]

Ya gotta love it!!!

[@Pernoctate]

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?

[@christophersmith8316]

Faults can cause uplift, but also when glaciers melt the crust "rebounds" some producing general uplift over a wide area. I'm not sure in each case which the cause was, but since faults remain visible due to offsets in the rock, where rebounding would not create any the geologists could tell you what caused what.

[@TheRiehlThing42]

The river "spuds" would have been there first, but some of the wind gap (failed river gaps) would shift the river, but the "spuds" would have remained, and then lifted later, even though the river was long gone. The lava filled river valleys would have been in river gaps, that hadn't became wind gaps. That's what I'm gathering from the lecture.

[@lauram9478]

❤

[@markt9319]

Sorry Patrick 😎

[@xojewel1]

Today’s lesson brought to you by Emily 2

[@stevew5212]

fascinating

[@steel1182]

Yay nick,!!!

[@MrChappy39]

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

[@valeriehenschel1590]

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.

[@user-smalltownAK]

..those river rock potatoes had a good laugh, according to Professor Nick..! Perhaps someone could suggest how potatoes ~ or rocks, can get in a laugh or last word?⁉😊

[@marianfrances4959]

👍🇨🇦😎

[@anthonywickhamhoill288]

😮6th 😅😮