Geology of the Portland and Oregon Basin
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- เผยแพร่เมื่อ 9 ก.ย. 2024
- The Portland Basin geology is an amazing story of floods of lava, rock, and ice. Retired attorney and educator Paul Edison-Lahm is Communications Director and Past-President of the Geological Society of the Oregon Country (GSOC) - the oldest collaboration of amateur and professional geologists in the Pacific Northwest. Paul has developed numerous Portland metro field trips with GSOC, which are the basis for this virtual presentation on the Portland Basin’s dramatic geological history.
I have absolutely no skin in this game, but I couldn't stop watching. Excellent presentation, and now I've learned a lot. This is what youtube was made for.
Terrane wreck...Love it!
Yep that's a good one 😁
Another Zettner fan for several years. I grew up in Eastern WA and now have lived in Portland for almost 20 years. It has been interesting to try to piece together the local geology from what I had already learned, but this is great to get some more info to clarify the model in my mind.
Complete lay person
and yet, seen quite a few of these geology videos
I swear this is the best one
This just adds to all the great literature and videos on the Portland Basin that I've sought to learn from since I live in it. Fascinating, and somewhat reassuring, that I live in a quadrant of the Portland Basin that is least subject to liquefaction in the event of a Cascadia mega-quake. A small consolation; I hope none of us are here to experience a Cascadia full-rip because it won't be pretty. But I at least take _some_ comfort in knowing I could probably ride one out and live.
Absolutely fascinating! I was raised in Eugene and my father was a metallurgical engineer who delighted in sharing his knowledge of geology with his kids during our travels through the PNW and Montana. I have become addicted to Nick Zentner's lectures and was delighted to watch this video. I've lived in Michigan for the last 52 years and have delved deeply in the geology of the Great Lakes, which is also fascinating, but I am delighted to learn more of the geology of my childhood. Thank you and your viewers.
th-cam.com/video/3HDb9Ijynfo/w-d-xo.html
Horst = an eagle's nest high in the mountains
All the best, Willem
Good to see all my fellow Zentnerds in the comments. Excellent presentation.
I have no idea why this was recommended to me but I am glued to it
Stumbled on this by good fortune and enjoyed it so much. You're right about the information available from Nick Zentner's TH-cam videos.
Fantastic! Thanks for putting this online.
Your explaination and animations of the accretion of exotic terranes is very good. This 45 minutes helped make a lot of sense out of what I've been watching Nick Zettner discussing for years. Thank you! Well done! I love getting to Oregon to rockhound.
th-cam.com/video/3HDb9Ijynfo/w-d-xo.html
If you visit the St. Helens Riverview Amphitheater, take a close look at the face of the steps leading up into the stage house. It would probably take a good pressure wash to see it now, but there is a countiuous double rainbow mosaic composed entirely of +- 1" smooth pebbles, all from Missoula fllood deposits dredged at Scappoose. The washed pebbles were sorted by color by a crew of differently abled youth and cover the entire spectrum from red carnelian to purple agate and every color in between. A close inspection would be fun for knowledgable lapidaries and geo fans.
The seating tiers, like the nearby landmark courthouse are both made of hand laid Columbia basalt. I designed the amphitheater and was project manager, but that rainbow is my secret easter egg, now long hidden by grime I expect, but it will be there long past my time.
I would love to see a photo of this. Do you know of one that's online?
@@priscillaross-fox9407 Also, they are tearing down the old gazebo and steps for a new bandshell and other improvements. C'est la vie.
the best place to be... where there is good information...
Mr. Edison-Lahm's journey through this science almost mirrors mine. While he was living in Northridge during the Sylmar quake in 1971, I was living in Long Beach, about 30-40 miles south of Sylmar; and that woke me up at least to seismology if not geology at the time as a teenager. My family owned a condo and cabin in Mammoth Lakes at that time and while I had a rudimentary awareness of the volcanism there, it wasn't until about 12 years ago that I discovered that Mammoth Mountain itself is a dome complex sitting on the rim of a Yellowstone-type super-volcano, and my eyes lit up. I had no idea we were sitting in a caldera 20 miles in width that we simply knew as Long Valley.
Well, by this time I'd moved to Vancouver, WA about eight years after Mt. St. Helens erupted, and again I was aware of the volcanism here but none of the geology; so I studied the Long Valley supervolcano, which led me up north to where I am now and how all this land and volcanism got here -- which led me to Nick Zentner, a professor at CWU whom we living in WA are lucky to have in our midst. What I've learned about geology since 2015 and the processes that have shaped the place I live in, I've attained about 95% of that knowledge from Nick's selfless work in teaching the public about the diverse geology in the PNW. We owe him and the geologists who have studied this area a debt of gratitude for what we now know about the geologic hazards as well as its history and where it's headed in the future.
Good video. Thunder eag formation was interesting. Thanks.
PSA "The Only Way to Fly!"
The amazing voice of Jim Backus.
Regarding the Spokane area, basalts are the primary story but there are the remains of very old granite mountains running north-south right through town. Mt. Spokane, Beacon hill, Dishman hills, etc. There are some quartz outcrops if you look hard. Love this stuff!
Back in the early 80s building service stations I was surprised to see 4" round rock and corse sand at 57th and NE Fremont when doing a tank install. It's a high point miles from the river. Having a better understanding of the geology and the great flooding I see how it got there.
I love all of the animated concepts. I’m saving this video!
i am totally just a lover of geology without academic training, I absolutely loved this, thank you!
Hi Paul. I live very near you in the Creston-Kenilworth neighborhood. I'm a big fan of Nick Zentner. Appreciate the Portland focus here.
My exposure to geology in undergrad was wasted by my youth. This was absolutely fascinating!
So let me get this right you still had youthful indiscretion when you were in graduate school? Are you in the USA? Who paid for your education here because it's $100,000
@@kevintewey1157 Yes, I'm in the US. I was very serious about my graduate studies, but they were focused mostly on computer science. I was funded on a research grant that covered all of my tuition and gave me a small stipend to live off of.
What a great speaker/ teacher. It's so nice not to hear " umm" " you know" every 5 words. Really appreciate this excellent vid. Fascinating content 👌
Well done team
I’m sure I wasn’t the intended audience for this- I’m just Some Guy™️, but-
It was fascinating and delightful to watch a group of people so clearly enthusiastic and knowledgeable talk about something they’re so passionate about!! Thanks for letting me eavesdrop on your zoom meeting, folks!
Western Oregon also has dinosaur fossils down near Sweethome east of I-5, though fossils can be found other places west of the new Cascades. The Sweethome area is also a great rock hounding area especially along the Calapoia River.
Great presentation...👍👍
This video is very informative,. I got questions to several things I've wondered about, even things that I've drove by multiple times. Lol
I grew up here in SE Portland a couple of miles east of where I live now. There you couldn't dig at all without coming up with worn rocks and sometimes boulders. We hand dug under the house enlarging a basement and took out more rock than soil. Where I am now, near Reed I dug a ditch about 20" long and 6' down and found 2 rocks left over from the pouring of the concrete basement walls.
Awesome! You covered so much great info here. Got to see some more vids. Thank you!
I'm from Oregon and familiar with a lot of this, but there's so much fascinating stuff to learn about, just in my home state.
My grandparents had a property on the quite flat countryside in Washington about 8 miles north of the I-205 Portland-Vancouver bridge on the Columbia River.
I remember seeing a 1-1/2 to 2 foot diameter granite boulder in the woods on their property. Is there a geologic explanation for this?
Sounds like it could very well be an erratic brought by the floods!
I think you forgot a major flood. The Bonneville flood also drained down the Columbia, you guys have got rocks there from northern Utah and southeast Idaho as well.
Is seletsia part of the heceta banks sea mound.that is 40 miles off of Florence Oregon?
I saw a video of some of Siletzia today. I will never see these places in person so nice to see anyone doing videos of a little of what I learned over the past couple of years and was able to retain. I had ancestors in Washington state + there was a gold mine named after my home town of Wauconda, IL although it wasn't the only gold mine with that name.
I may also have some living relatives in Oregon too, I'm not certain yet. Time to listen to more of your video.
Is the tip of Elk Rock Island (in the Willamette River just west of Milwaukie, OR) part of the old Siletzia? There is pillow basalt around the water's edge of Elk Rock Island.
(BTW, excellent presentation! It made me subscribe to this TH-cam channel!)
Thanks for this. Been a hobby of mine for several years now and have done alot of reading and research on the Geology around Portland (since thats around where I live), but also around Washington, Oregon and the Southwest. Ive got a huge stack of papers of Geology about this area I've read over the years. Love presentations like this. Have a GSOC sticker on a car, from a Zettner presentation I saw at PSU by GSOC.
There is no better _teacher_ of this science than Nick Zentner. Almost everything I've learned about WA geology and the area I live in -- the Portland Basin -- came from Nick and his TH-cam visibility. He's shared his knowledge and teaching skills to the world, gratis; and he deserves all the plaudits he's getting from his colleagues and the public.
Anyone know where the lowest point in Lake Missoula was? At the outlet?
Montana West of the Great Divide was also part of Oregon Country
exceptionally helpful
Thanks for uploading this video. I absolutely love learning anything about geology. I wish there wasn't a black wide strip on the right side of the video,as it makes it much harder to see the legend table. Regardless, I enjoyed this very much,and I love Nick Zentner's lectures as well.
this is cool = thanx for the education, i'm from saskatchewan = the prairies 🤔🤔🌳🗿
Awesome video! grew up in the SFV, 10 minutes from northridge and now am living in the PNW!
I've taken essentially the same path -- lived in Long Beach during the Sylmar quake in 1971, then moved to the PNW 36 years ago and have lived near Mt. Saint Helens for 34 of them. West Coast geology is some of the most complex geology anywhere, but it makes for some gorgeous landscape and scenery. BUT....there's a price to pay for all that beauty and it's a very dynamic geomorphology. Fascinating nonetheless.
we are thinking of moving to the Vancouver Washington area and looking for small acreage. When we start looking for land is there someone we can contact before we build regarding earthquakes.
The Oregon Dept. of Geology maintains an earthquake hazard map, and it looks like Washington DNR has something similar ( www.dnr.wa.gov/programs-and-services/geology/geologic-hazards/geologic-hazard-maps ). For a particular property though - especially if on or near a slope or body of water - a survey by a geoengineer is the most authoritative.
I hope this helps - and good luck!
thank you@@oxnardgemandmineralsociety720
Check for possible areas that could become liquefaction. Never build on a steep piece of property no matter what the scenery looks like. Many a home has slid off of the hills in a heavy down pour or leak in underground water lines.
Assuming you haven't moved here yet, I live here and would suggest that if liquefaction is a concern you look for acreage anywhere from about Brush Prairie north into Battle Ground. Probably the surest place to build or buy.
@@oxnardgemandmineralsociety720 thank you
Best thing a Rockhound can do is join a local gem and mineral club. 25 years member of the Arlington Gem and Mineral club in Texas trust me you won't be sorry.🇺🇲😎
We totally agree! The camaraderie of rock minded friends adds to the enjoyment of our hobby.
Graben means ditch or valley, not grave. Horst (think hurst) is a promontory or rise, not a person's name.
HE WAS THINKING OF HORST MAGER OWNER OF THE RHINELANDER RESTAURANT ON SANDY BLVD.
@@gordongadbois1179 That would be a Horst of a different calor.
when the yellowstonehotspot was out in the Pacific still
btw, Horst means Heap in german, not a persons name. Its basically a hill or uplifted area
Very informative lecture, thanks for posting! The subduction animation @11:00 raises a question I've had for years and I'm sure there's an explanation even if it's just a lack of information on my part, but why aren't there massive amounts of debris stacked up along the continental shelves from millions of years of subduction? Especially, if subduction has enough force to push seafloor inland and raise mountains it seems impossible for there not to be an equally massive amount of surface evidence along the continents globally.
I think the view is that that is what the coast range is composed of.
There is. He covered that in the beginning of the video. Only extremely large things get accreted onto the continents at subduction zones. The rest is pushed down into the mud and gets subducted.
yep I been listening to Nick Zetner
A delayed humor about the Northridge quake. My sister lived in bouquet canyon santa clarita. She and her husband were thrown several feet in the air from their bed as the first shockwaves passed thru. 20 years later I called her. She was at work. Ask if she recalled the earthquake.. I ask when the shaking stopped. Did her husband lean over and whisper in her ear . Did the earth move for you too. The clunk of the phone hitting the floor and lots of laughing is all I heard..
Great story. Thanks for sharing!
@@oxnardgemandmineralsociety720 strong ties. They bought that home in a tract partially framed. He went in and added strong ties everywhere he could get them. There was no damage even though the house was thrown upward hard enough to throw them into the air twice. Not a single crack in the plaster. Every other house had major structural damage. The hector mine quake had the light in the stairway swinging over 6 feet left a 18" crack over the kitchen doorway.
The los angeles department of building and safety has a lot of info on retrofitting for quakes.
The 4 story brick apartment building across from where I live now had major sections of the walls collapse but the internal steel structure held the floors up. When the new building was almost finished they carried in giant paintings for the lobby walls. I ask the artist how he chose the subject. He said it just came to him. Later that day the building owner was standing in my driveway looking thru the windows at the installation. I ask him about the theme. He said it was just the artists idea. I said. Falling bricks is what happened to the old building. He gasped. He had not even recognized that. Exit 101s at sunset. Second floor on the corner unit. Easily seen in the evening.
Since this video was made there has been some rethinking about the Missoula floods. For example, there is evidence that some of the debris and erratics that lie in the channeled scablands of Eastern Washington came from the Canadian Okanogan valley far to the North.
Examination of sediment layers near the Wallula Gap seem to say the
Area was flooded dozens of times., and that the water sources may have been from under the Columbian Ice sheet.
How far will the content drop when the slip happens
The PNW has some of yhe most facinating geology on the planet. Of course if you look at the entire world IT'S ALL FACINATING! I suspect having grown up here I'm heavily biased though.
1971 Northridge quake. Then Mt St Helen’s cataclysmic event 1980, not quite a decade.
I remember PSA. One-way LA-LV $29.00. Either direction, just as interesting
What's up with the Rouge valley down south west Oregon I call home.It looks like there was a lot of water here at some point and all the hill tops have big rock poking up. What happened here long ago??????
He says that Mount Hood is about two million years old 9:04. A Google search of 'age Mount Hood' disagrees. Mount Hood is thought to be 500,000 to 700,000 years old.
🤷🏻♂I probably got it wrong then - will have to check - thanks
Cool
The name is of Old High German origin, meaning "man from the forest", "bosk" or "brushwood". In modern German, "Horst" is also a translation of English aerie, the nest of an eagle or other bird.
terrane wreck... thank you
Love subduction zones. But can't you speed them up and make them take continental crust down? They would be a great recycling machine.
What about mt bachelor? Isn’t that part of the cascade range?
The tremor map shows a little activity for a long time. Is that normal?? Don't larger EQ happen during episodes of non activity there?The EQ of 1906 was large and they were large all around the globe. I looked it up. Expecting a BIG one??
Wouldn’t those trees have been uplifted again with stuck portion of the coast having been uplifted for the past 300 years. Also the average for the cascadia subduction zone full rip quakes are 500 years. We are not overdue unless its a partial rip of the southern section then perhaps it’s about 300 years. Thank you Nick Zentner!
I would like to hear a talk about how many millions of years it took for the Grand Canyon of the North Fork of the Toutle River to form after the 1980 Mt. St. Helens eruption?
Gotta be careful. There's pitfalls in them outcrops.
I'm pretty sure the every 300 years for an earthquake part is only based only on Oregon and Northern California. Washington deposits show only every 500 years
Quite true; the southern margin around the Gorda plate is twice as frequent as the rest of the JDF Plate. They're overdue for one, but I don't anticipate a full-rip when the next one happens, I think it'll just be the coast from Eureka to about Coos Bay.
Geology of Portland and Oregon
Thumbnail is a picture of Washington.
Geology of the Oregon basin................and you put up a map of the Washington provinces.................brilliant.
Yet the whole rest of the video is about the Oregon basin and the geology of that area. Not too bright of a bulb, are you?........ 🤦
@@BackYardScience2000 Grow up.
there is a 30% gray bar that occupies the right side of you video
That's part of the video. Go see 13:05 , that space is used in that section. You didn't watch the whole video, did you? Lol
I never knew that a lava flow could go underneath subterranean sediments and then erupt as a volcano.
Missoula floods were much older than 18k years ago. There were many right
😃♥️😯🙏👍👍
PSA - people scattered about
I thought granite was not a naturally occurring rock
Granites almost exclusively are formed as a consequence of magmatism and volcanism. Much of the granites I've seen have come from either plutons or batholiths which while underground were molten rock and cooled as they rose due to tectonic forces. Some of it is erupted out of stratovolcanoes with highly viscous lavas but most of what I've seen are in plutons.
So subduction is where the late catacombs where formed from? From old mud subducting with the bottom.heating mud up and steaming out as methane? I'm a 4th generation commercial fisherman.and probably know catacombs better than science.i have been bringing chunks of the bottom in for science. And if geology wants samples,contact me,or osu Charleston.
Catacombs use to stand 50 to 80 feet high.
Hmm, nothing about the Washington Selkirks. There isn't much about this area and why we have random volcanic rocks and cones.
You would "try" to take BC. 😉
you're really striving to avoid discussing ET impacts here, given that both the basaltic flood and the "Missoula Floods" (sic) were due to impacts on the landscape. The former formed the hotspot that is today Yellowstone, and the latter was one of many impacts around the world that impacted the icecaps and resulted in the Younger Dryas epoch.
Don't know why discussion of et impacts is so taboo, but the public needs to be aware they are in an active shooting gallery and how it has impacted (and will again in the future) the lands they live on.
Nick Z. Is the best. It's so crazy beautiful there in Oregon and Washington but... the government there has just completely lost their minds.
You can say that again...."Lost their Minds!"...🤪👍
They keep getting an influx of the scatter brained from my former home state, California, since the early 70s. Wing nuts mainly from LA and the Bay Area. They tend to flock together in or near big cities.
If you are interested in living Republican bliss, Kentucky, Alabama, and Florida are just for you! Ready and waiting. Us Liberians will endure the purgatory of living in the PNW with a government focused on helping people rather than corporations.🙂
@@RandellP hey genius no business no money, no money to help anyone.
@@elizabethjansen2684 plenty of businesses here in WA state, but yeah is horrible here please don’t come
Eastern Portland is built on a Gold mine.
Every river around, loaded.
The Americas were once part of what is now Asia and the proof is in the oceanographic maps which show clearly the rupture line between 4 continents that used to be one. Google earth shows this as plain as day.
Hello, I enjoyed this presentation and I wanted to comment my position for people to consider:
As a Christian, I do my best to reconcile science and the Scripture. I believe most of this presentation is accurate, however, I do not agree with the timeline presented. For instance, in the Scripture records, the separation of the continents occurred after Noah's flood, which would make all this to have begun about 4300 years ago, to which I am inclined to believe rather than millions of years. Most people are not able to wrap their heads around this, but I believe it, especially when considering how energy excited slows down exponentially faster. If Scripture is true, it would present several things. One for instance is, life is a lot more precious than people are taught to believe by evolution and mainstream science. Kind regards.
Siletzia
Understanding the problem so we can understand the solution. Regional mega drought in the southwest, caused by a lot of things but essentially more water is being used and is in one way or another moved out of the region then the amount of water that is re-entered into the region. Conservation has its place but it is not a solution to this problem. The demands on water will not abate without causing complete collapse so the only alternative is to introduce a new source of water. Drawing water from other regional rivers like the Columbia or the Mississippi or Missouri would only move the problem around, draining other regions. The only essentially inexhaustible source of water is the ocean.
One thing we need to do is move water from the ocean back inland to places we need it and if we can do that while generating clean energy we have a chance to mitigate climate change and still have a prosperous future. It is really, really hard but it is not impossible.
If I could explain my idea in an equation it would go something like. (seawater from the west coast moved inland + converted by combination geothermal/desalination projects = clean water and clean energy.) The biggest idea I am trying to express is tunneling aqueducts from the coast, in this case the west coast of the USA inland to feed combination geothermal power and sea water desalination plants. The idea seems to be so big that no one has considered it possible but I believe it is not only possible but it is necessary. For over a century the fossil water contained in aquifers has been pumped out to feed agriculture, industry and municipal water needs. The natural water cycle cant refill fossil water deposits that were filled 10,000 years ago when the glaciers melted after the last ice age. Without refilling these aquifers there is not much of a future for the region of the United states. As a result ground levels in some areas of the San Joaquin Valley have subsided by more than 30 feet. Similar fossil water depletion is happening in other regions all around the world. TBM and tunneling technology has matured and further developments in the industry are poised to speed up the tunneling process and it's these tunnels that are the only way to move large volumes of water from the ocean inland. The water is moved inland to areas where it can be desalinated in geothermal plants producing clean water and power. In many cases the water will recharge surface reservoirs where it will be used first to make more hydro power before being released into rivers and canal systems. It's very important however to not stop tunneling at these first stops but to continue several legs until the water has traveled from the ocean under mountain ranges to interior states. Along the way water will flow down grade through tunnels and rise in geothermal loops to fill mountain top pumped hydro batteries several times before eventually recharging several major aquifers. What I am proposing is essentially reversing the flow of the Colorado River Compact. Bringing water from the coast of California first to mountaintop reservoirs then to the deserts of Nevada and Arizona and on to Utah, New Mexico, Colorado and Wyoming. This big idea looks past any individual city or states problems and looks at the whole and by using first principles identifies the actual problem and only solution. Thank you for your time, I would like the opportunity to explain in further detail and answer any questions.
Or we could start dancing, dancing, dancing!
🤣 the final flood of the Colombia!
It's no wonder that living on the west coast is so much more exciting than the east coast. We are all living in a terrane wreck😁😁
I was better the first time you found me
26:16 Catastrophism with the expected anti-industrialism. The type of ideology that is destroying Portland much faster than geology.
You mist the important stuff / the floods - mud - northward river. Look a little deeper
Terrane wrecks ?!?!? 😂😢😂
Didn’t the Biblical flood take forty days of rain? Maybe that’s what you are seeing?
If you would like to buy a home or rent in a gold belt respond
You're fired.
Not sure I like the map. Stay out Idaho!
Who composed this? Who edited it. This is high school nonsense. Do better or don't bother.
Come here to listen to a lecture and find myself reminded of the white privilege of marching to someone else's land.
😂 get a life
Man, this started off bad and just got worse. I was already shaking my head when you started to brag about being the oldest collaboration bla-bla-bla. Phoo-hockey to that!