Paleomagnetism & Ice Age Floods w/ Bruce Bjornstad
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- เผยแพร่เมื่อ 7 ก.ย. 2023
- CWU's Nick Zentner returns to Marengo with author/geologist Bruce Bjornstad to learn more about pre-Wisconsin Ice Age Floods.
Marengo exposure: goo.gl/maps/pJsA5wbmJrkvRvRJ7
Skye Cooley video from Marengo: • Pre-Missoula Ice Age L...
love this stuff...I'm a Chicago native that moved to Idaho in 2019 and have fallen in love with this country and the Pacific Northwest as a whole...Nick has taught me so much about this whole area and I just can't get enough of it. Thank you Nick for enriching my life
Zactly same here, still in Chicago. Nick if you ever visit, i would love to host you at a fabulous chicago steak house and a trip to the Field Museum of Natural history rock collection and display. I know you’ve seen a lot but i believe you would be impressed by this cow towns collection from all over the world.
Fantastic! Great to hear from Bruce!
Thanks for the virtual field trip. As a retired geologist I don't get out as much as I used to. Thanks too for pointing out just how complex earth processes can be and why our knowledge is so incomplete. There's always more questions than answers and too few people working in these various fields of quaternary geology and climate change. Jokingly we always ended our field excursions by saying, "more work needs to be done." ☺ Glad to see more work being done.
This is such interesting and important work. Thanks, Nick, for this extraordinary interview with Bruce Bjornstad letting us know about his research.
Loved the discussion on Paleomagnetism! I learned so much this field trip! 🤓
I am speechless on being able to describe what my mind is trying to picture. I want more of the story and you are giving it every time I tune in. I have never been more interested in something all of my life. You’ve got all my attention, Professor thank you again.
The milwaukee Rail Road western expansion was completed in 1909. That cut would have been done between 1906 and 1909 unless a regional RR was already going through there.
there was a comment about this cut being made after the original track was built.
Greg Whitehead do you have a resource to find a date?
This cut was newer after a passenger train derailed in a sharper previous curve.
Nick, thanks for showcasing Bruce's work, Bruce thanks for the knowledge and friendship. John Lasher
Awesome! Geology is being a detective investigating the scene, collecting evidence samples, interpreting the test results and piecing together what happened.
Bruce's book is beautiful and I highly recommend it to anyone interested in the topic.
Glad to see Bruce on the channel. I've been a fan for years. His books on the Ice Age Floods clear up much of the mystery and are indispensable to anyone interested in this topic.
Amazing!! All the years of my growing up I just wondered at those layers and assumed the top was “recent”. I love that country❤ Thank you, both for all the stories and knowledge.
I've hiked several of the trails in Bruce's Ice Age Floods books. The trail logs are quite accurate, easy to follow and informative.
SO excited to watch this video, but I must write this first! Bruce's work on Ice Age Flood geology, along with his tribute to Tom Foster, are wonderful. I've been working on my own presentation, combining the I.A. Floods with my field of work, and I return to Bruce's videos over and over again. While I intended for my first presentation to happen in Miami last month...I had to put that on hold while I travel this Spokane flood work with you (and Bretz), Nick. So maybe next August in Miami, lol. It's all good because this adventure and this work has brought me such purpose. I owe much to you and Bruce - thank you!
There is a cut just south of this one, 1911 a year after the line was completed there was a fatal crash. The curve is very tight and was relocated to its present location…I would imagine it was done soon after that wreck. Love the videos!!
Love this. I have all three books, but the field guides were useful when I was out there in 2022, and Bruce's drone videos are gorgeous. Almost as much as Nick himself, Bruce's videos are what hooked me on this stuff. Then, after seeing much of the country from ground level in 2022, the aerial viewpoint makes a huge difference in appreciating the overall story. I've gone back to watch several of the videos multiple times after seeing things from ground level.
Amazing to hear and see how loess is sampled for paleomagnetic research. Thank you Bruce and Nick!
Well, that was surprising, and I'm glad you spoke for us, Nick, wondering how loess could give paleomagnetic data. And Bruce, for explaining differences from basalt paleo findings. Reverse polarity, even. We go ever finer in our understandings. This is great. Plus, it's really fun to see you out together. 😁
Thank you, Bruce Bjorstad and Nick Zentner for the excellent job of bringing these great flood stories to the public eye, in an interesting and engaging manner!
Rip up class of Loess in the 780,000 year old deposit? If I’m understanding this correctly, probably not from very far away? Violently tearing through the loess layer creating the many nearby loess islands. In a very ancient huge flood!
What a fascinating guest! Thanks for introducing us to Bruce. Just subscribed to his channel.
Great Stuff! Interesting that in the 90’s non one cared - now there is interest!
WOW, wow!! Reversed paleomags! SO intriguing, thank you, Bruce and Nick for the video!! 😄😘✨💗
Awesome, awesome! So great to understand more about these deposits!
Excellent outing and truly valuable information. It’s remarkable, too, how much Bruce sounds like Steve Smith on “The Red Green Show”. I keep waiting for the punchlines! (Red Green Show episodes are available on TH-cam if you haven’t already experienced Bruce’s alter ego at The Possum Lodge).
So I wonder what it would take to get a backhoe in there to expand the cut face deeper to allow more sampling below what is exposed now.
Thanks a lot for this Nick and Bruce. Have read Bretz's flood and really enjoyed it. Looking forward to getting Bruce's book. All the best.
True Masters at work!! Enjoyable and Most Interesting... 😎
Thanks nick, an Bruce
This is just so fascinating! Thanks Bruce and Nick!!! I have been wondering about these types of coring to get pre-historical dates.
watched again get a little more each time thank you
Now I really want to drive that old sunset highway.
Love, love, love Mr. Bjornstad's videos and commentary.
His books are unequalled resources on the Missoula Floods.
Excellent video! The age and magnetic reversals just blew me away. Bruce is a nice guy, too. Y'all make a good pair, or add Skye and y'all would make a good trio. 😀
makes me very happy.....thank you!
Wow. This Hugh flood story is more complicated that I imagined.
This is so interesting. Looking at recent glacial outburst flooding I can see where glaciers would leave their mark on the landscape far beyond their borders. With ice sheets that are miles thick the scablands would seem to be natural drainage from those ice sheets. Probably they channeled the outburst floods from the retreating ice sheets. It’s pretty cool that the loess preserved the flood evidence beneath them.
We have used both of Bruce’s excellent Guides to find and hike the trails of the Ice Age Floods over the last three years. Highly recommend his books including the Floodscapes photo book. So much knowledge packed into all of these. Thank you for this video exploring the older ages with Bruce. As Bruce said, no one was much interested in the older deposits until recently…..that’s you Nick. Thank you.
Thank you so much for this awesome info from a dedicated and disciplined worker. You rock, Bruce.
Thanks Nick!
Good to hear the talk and see the subject. Could do with seeing the spelling of and some explantion of the words used. Did find things to do in Luss Loch Lomand which was a new experience. Eventually found loess and pleistocene 2.5 million - 12000 yrs ago. Is 12000 yrs ago the Younger Dryas? Younger Dryas seems to be a period from warm to cold and back to warm. Dryas. Rosaceae is a plant.
Thanks for making and showing the video with Mr Bjornstad.
Awesome Video! Thanks Bruce and Nick!
Great job
Gotta love it ❤ thanks nick.
Thanks to both of you always interesting.
Thanks to both of you. I love finding out stuff about my beautiful state.
Nick, just a great session that works well with your conferen e videos and applies so well!!! Thanks so much!!!
Very informative and interesting video Nick.
I was a pre-internet geology student at the University of Oklahoma and pretty much had to trust their 'twang' as the way it was pronounced. This worked fairly well for a few common terms.
I learned "loess" being pronounced "less", which had its share of memes, or "lōs" which generated its own, but I don't remember having heard of it pronounced as "loss."
Not complaining -- I'd bet the competition to decide who is pronouncing it correctly is as controversial and heated as downgrading Pluto.
But the one that they CAN'T take away ...
"Geologists are gneiss people."
..another great video, part of an entirely fine bit of natural history lessons online; with captions, and gifts of knowledge, too!🌞 ~ from Kenai Mts Alaska
great videos
Greatly informative visit guys along the former Milwaukee Road railroad now the state owned public John Wayne
Pioneer Trail. I've read that the railroad completed this line in 1909 well before Bretz came here. On that note however
there may have been areas that were improved later ( via cuts and fills) to make some elevation changes to improve
speed and travel time . I got to get that third book!
I think we need a topographical map of the surface of what old flood deposits we have. How much lower was the landscape for ~million-year-old floods versus the later ones?
Nick, hot da...those fuzzy mikes are outstanding. Watching you slip & slide yesterday I think you could use some type of body cam vest.
Bruce I think you left your trowel at the site. I left it standing next to a bioturbated tube that appeared to have ash inside. Also crazy as this sounds I found what looks like Ringold formation/sand hills deposits over the top on the SW side of the hill on private property.
Delighted to see you are right back on the old-flood story, how do you differentiate between unsorted flood deposits and unsorted glacial till? The ripped-up clod of loess is a genius method, Mr. Bjornstad can really read a road cut and make it tell a story! Does Bretz make those kinds of distinctions way back then? Utterly fascinating, thank you!
Wow - that was fascinating! Thank you Nick and Bruce for the awesome field trip. Now I want to know if Bruce (or others) have done paleomag samples for any other Columbia Plateau areas. I find myself wondering, for instance, about the potential loess deposits that were on elevations untouched by either glaciation or flooding on the upper Grande Ronde basalts above Malaga on top of Jumpoff ridge and then going south along the west side of the Columbia towards Vantage. Also I am wondering how much testing and what type of testing was done on the deposits at the Horse Lake road site in back of Wenatchee. I can see there will be a LOT more reading in my future this fall, LOL!!!
good stuff! Outstanding work (:
Wow! Thanks Nick and Bruce. So those Marengo gravels as 1 million or more years old and are older than the "recent" ice age floods that Bretz was thinking about. And I have some new books to order.
I ordered Bruce's books looking forward to reading them.Hoping to be able to roadtrip out and see some of these sites in person.
Money well spent. They are great.
Keep on rock hunting in the free world. Yeah definitely 😁
Thanks for the great content Nick
So, hmm; the magnetite PM can be effectively measured from single magnetite grains 1-10-µm after they’ve been liberated from their previous igneous rock source?
Like a compass needle always pointing to magnetic North.
How loose does the matrix have to be to enable the grain adjustment before it gets locked in?
Omg, I wish that was 3 times longer!!! If I could only buy one of Bjorn's books, which one would people recommend?
Another great video.
Do you have a donations page, patreon, or crowdsource type acct?
Late as usual guy here.
And now it's time to listen.
Timing is overly important I do believe.
Fyi we got The Trail book, nice.
Wow this is awesomely old lus
Gravel at base of exposure grades upward into silt-pebble diamict, then into wind-deposited silt. The overlying calcrete ledge is developed into the silt. I disagree with my friend Bruce's 'bioturbation' interpretation for the diamict. There are cobbles in there too large for beetles, ants, and gophers to move. Gradational contact with gravel below. Clear, abrupt contact with loess at top. Clearly a water-transported unit. Diamict is a thing, especially in pre-Wisconsin deposits. Great video!
Bioturbation also includes the effects of plants and their roots, which Bruce notes.
I find that very interesting. Does the lab determine where the sediment came from?
i think you could flood the wall with a liquid thin glue/epoxy , let it cure then cut out a stable cube?
Well, I just learned what a Brunton Compass is ... interesting. 👍
I don’t understand how the wind or water borne magnetite grains in loess can be constrained upon deposition to indicate ANYTHING magnetic. Loess should be magnetically amorphous.
Same way you can sprinkle or toss handfuls of powdered magnetite or just plain iron filings , close by a magnet , and , the majority of them would align with the magnetic field lines of the magnet .
Try it with a mix of sand and iron particles , and see if that changes , in any fundamental way , how the iron reacts to the magnetic fields .
Many processes are easy to study and to reproduce experimentally , and , humans have been studying magnetism for a very long time , even before we had the common language of mathematics to describe and quantify the phenomenon .
you could then do the same with a wet powder or slurry , to see if the same mechanism is affected by water .
Hmmm. Okay. I was stuck on the magnetic alignment created upon cooling of the magma source. Upon further thought, the mag signature sought is for the earth’s polarity at the time the loess matrix set, not paleomag orientation. Thanks for the help.
I take this is "tomorrow night" mentioned in How the Rocky's were formed?
Nerd alert, Bruce is wearing the Ray-Ban 2016 Daddy-O sunglasses. I am a former optician and literally sold 2-3 hundred of them. Great frame for prescription eyewear.
So the loess orients itself magnetically as it is being laid down? Amazing.
Yes. I was impressed. Glad he explained it’s the magnetite particles in the silt. As it settles in still water, they must tend to orient with the earth’s magnetic field. I understand the particle alignment with the inclination of the local magnetic field (just like happens with non-magnetized iron filings dropping on a sheet of paper with a magnet underneath, but in 3 dimensions), but I thought some residual magnetism of the particles would make it easy to detect which direction is magnetic north vs south. Maybe inclination reveals it by different inclination depending on which pole is magnetic north
❤❤
The line "nobody questioned the work we did" has me sort of concerned. Its been decades since my last college science course, but I'm pretty sure questioning everything is part of the process.
but Bruce also said that there was little interest until recently. I wonder if Nick's work helped bring these to peoples attention again.
Does this mean that the carving of flood channels started 800 thousand years ago? Or more?
On the former Milwaukee Road right of way.
Nine cycles of floods in the last 780,000 years? 20:08
when and where can I get a guided flight on a fixed wing airplane with my 90 year old father in law who is keen on the scabland story?
Still waiting to book my flight, grandpas not getting any younger:)
Oh my God, he's de man
I stayed at a Holiday Inn once. But how does an ice age end or melt? A word you used long ago uniformitarianism (WOW), we are seeing glaciers melt all over the world. I once watched at video on an ice dam break, during spring melt the power to move so much mass was there in a smaller scale. Also watched a glacier melt in Ice land from volcanic activity. What we need is an expert on hydrology from melting ice. Pictures of run off from glaciers in Alaska rivers that ebb and flow change channels and erode new channels, Uniformitarianism? thank you stay safe ALL
Why from Chicago?
Railroads often needed a relative distance for mileposts marking their right of way. Chicago was the starting
point in the very beginning of the Milwaukee Road's start. The mainline originally ended at Mobridge , SD at the
Missouri River but other railroads they were in competition with demanded the railroad expand west too.
@@hestheMaster very interesting. Thank you
Why are you not driving on the good track?
ohhh yeah books with lots of pictures and diagrams lol 😂 😂
We try to understand Quantum Physics but still do not understand our planet, Thanks Nick
The concept is easy. It's the math, it's a tough & a foreign language.