Random Roadcuts, Episode #16: Unravel the Geology of a Lonely Section of Idaho Highway 51

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Learn to "READ" the rocks with this innovative video series designed to help you learn geology. Join geology professor Shawn Willsey and investigate a random roadcut, make observations, and formulate basic interpretations. Here in Episode #16, we explore a nice roadcut Idaho Highway 51 between Mountain Home and the Nevada border. GPS Location: 42.73158, -115.89825
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Shawn Willsey
College of Southern Idaho
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Twin Falls, ID 83303

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16 май 2024

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Комментарии : 60

@shawnwillsey 16 дней назад

Please be sure to LIKE and SUBSCRIBE. You can support my educational videos by clicking on the "Thanks" button just above (right of Like button) or by going here: www.paypal.com/donate/?hosted_button_id=EWUSLG3GBS5W8 Or: www.buymeacoffee.com/shawnwillsey

@RWBHere 15 дней назад

Maybe dumb questions, but why does that hill exist there, in isolation, with no obvious signs of folding and very few instances of faulting? Or are there folds/faults, which we cannot see, at each side of the outcrop? It seems to be far too friable for it to remain when everything around it has eroded. Thanks Shawn.

@charleymitchell5461 16 дней назад

Can't wait, Hey Lake Idaho. Great story. I know so little..

@mini30coupe 14 дней назад

Your narrative is refreshing. Years of learning brought to us very well. I learn your field with every search you do, thank you.

@dancooper8551 15 дней назад

Love these roadcut videos. I first watch them with the volume on zero to test my observational analysis. I then rewatch them to see if I’m as smart as I like to think I am.😎 So far👍😅

@shawnwillsey 15 дней назад

That’s a cool idea.

@robertdiehl1281 12 дней назад

Random Toad Cuts are really enjoyable geology lessons. Something that is usually missed on a quiet drive through these beautiful areas.

@richardwest9054 15 дней назад

Thanks, Shawn. Keep on driving and the Random Road Cuts coming.

@LisaBelleBC 16 дней назад

You are such a good teacher! I saw the fault before you said what it was! Thanks again for my fav random road cuts!

@kaytea2983 16 дней назад

Another great road cut and video. Thanks.

@hestheMaster 16 дней назад

Ancient Lake Idaho is a very interesting thing to go over in the future. Seemed to be very active then not then again thoroughout the time it existed. This Saturday marks 44 years since Mt. St. Helens erupted. ( May 18,1980)

@hardrockgirl5844 15 дней назад

I love these !

@jackienaturelover9761 15 дней назад

What a very interesting road cut. Really enjoyed it. Thanks for sharing.

@sandrine.t 16 дней назад

Volcanic ash: that's what I thought before you said it :) A wonderful explanation as always, really learning a lot with your Random Roadcuts! Thank you, Shawn! Hope you've having a great time in Iceland :)

@LouinVB 16 дней назад

You were 3-4 km away from the Bruneau Woodpile petrified wood collecting site that I often visit. I know this road cut you are featuring as I have stopped to look at it before

@joannekellam191 16 дней назад

Awesome road cut episode! Thank you!

@rogerharris8081 16 дней назад

This past week we’ve been on vacation and travelled along 189 which follows Provo river. There is a massive fold (syncline) that is absolutely beautiful! I’m sure you have seen this in your travels.

@JasonBower-ql3cd 16 дней назад

Hello Prof. From Lincoln, Nebraska 😊

@Riverguide33 15 дней назад

Always surprised at outcrops that seem routine at a distance….but have a dynamic story to share. 👍

@davidk7324 16 дней назад

Suggests widely fluctuating Lake Idaho levels over moderate geologic time? Ash à la mode.

@Darisiabgal7573 16 дней назад

Actually it kind of a cool road cut, the most stylish mudstone I’ve seen yet.

@Selah-dl3ef 15 дней назад

Thanks Shawn 💫

@rickfranz5054 15 дней назад

Very cool outcrop!

@christinedaly2694 15 дней назад

Thank you Shawn great information can’t wait to see yr videos on Iceland

@Hollandsemum2 13 дней назад

The Pennsylvania Turnpike has so.e spectacular road cuts at the higher elevations (where there are also fences to restrain falling rock) and also on either side of the three tunnels on the Eastern half. Some have clearly been moved geologically several times, with the layers at angles.

@valoriel4464 16 дней назад

Thx Prof ✌🏻 fascinating geo-adventure

@Ferda1964 12 дней назад

Road cuts of the West are great spots to investigate the rocks even with only some basic knowledge of geology.

@JorgeSanchez-uk4cb 15 дней назад

Good morning Professor we have unrest at San Andreas at Bradley. We got some swarming Have a nice day 😃

@YouTubalcaine 16 дней назад

I'd love to dig into that gravel bed to identify those cobbles and try to figure out where they came from. The variety of stone types suggests they were sourced over a large area, and they're all eyewitnesses, so to speak, to what seems like an interesting page of the lake's history. It must have been quite an impressive flood to behold.

@J0hnC0ltrane 16 дней назад

Using google your at the Bruneau-Grand region of western Idaho. One site places the the beginning of the development at 16 million years ago while the usgs site says 12 million yrs. ago which might be the Middle Miocene. Just a guess and a google search. Thank you for the video Shawn.

@MyMemphisable 14 дней назад

Thanks!

@maryt2887 16 дней назад

Great road cut video! I am always amazed at what you find in these places. I started thinking about docent-led art talks that I have attended. Helps one to notice the little features that a cursory look misses.

@briane173 16 дней назад

Windy-ass day that day, wow! Once we get schooled on Lake Idaho we should then be able to determine whether that road cut was strictly a stream environment or was along/below a shoreline given the alternating beds of sands and muds. Looking at the background it looks _fairly_ high in elevation compared to the SR Plain, maybe 2-300 ft. So hard to know if that section was ever below lake level or just above it.

@ThomasEckhardt 16 дней назад

Neat cut, thanks Shawn! Looks like some nice vertical bioturbation in the sandstone layer below the ash deposits?

@harryromo2508 13 дней назад

Very interesting. I was looking for signs of Bonneville deposits, but didn’t see them. I think you’re higher than that.

@raenbow66 15 дней назад

Exciting roadcut! Any attempt that you know of to estimate the length of time it took to accumulate it all? Thanks, Shawn!

@7inrain 16 дней назад

How can we differentiate between ash layers that had been laid down on dry land and those being deposited in a lake? The ash layers you showed at @12:25 looked like they were well cemented together and they even withstood gravity, with some parts of the layer beneath it missing. Is this the mark of an ash layer deposited in a water body or am I wrong here? Thanks for another interesting video.

@Joe-Skier 11 дней назад

I'm thinking there were alot of fluctuations in the lake. Lake rises, lays down a mud layer. Lake drops, streams go farther into lake depositing sand. And the process repeated many times

@samuelbess3038 14 дней назад

Fascinating...no mention of direction of flows origin of the sedimentary materials, generally said volcanic depisirion...no mention of rapidly of depisition.. type of fault?....clearly after all sedimentary and volcanic layering ended...why nothing continued?

@johnlord8337 16 дней назад

With all these wet expansions (floodings ?) and retractions (massive droughts and drying up with windblown sands ?) of this Lake Idaho, especially with the mudstones, ... wouldn't there be the possibility of organic life, and freshwater or saltwater critters (even if down to diatoms and plankton) finds in these layers ?

@nickmcgarvey6463 16 дней назад

Shawn, I want to tell you about a road cut in the middle of nowhere but not that far from you. What's the best method?

@markuschampos5750 16 дней назад

What's the timeline for each layer? Is it possible to determine that?

@georgepeck9288 16 дней назад

Can estimate the time sequence here? How duration does each distinguishable layer represent….seasonal or finer?

@oakhillclassroom4827 15 дней назад

When and at what point as a geologist? Do you finally talk about the liquid model sun ????

@clydecessna737 15 дней назад

...so is that fault or offset evidence of an ancient earthquake? [Great stuff as always.]

@robmagee100 16 дней назад

Love the road cut explorations! When I was looking at some of the sandy layers with angular variations within the layers, the word “varves” came to mind… Is that off-base? I guess I don’t have a solid idea of what a varve is… I’m thinking it is an indication of change of deposition direction/current?

@briane173 16 дней назад

They could indeed be varves, at least on a small scale. Varves are typically laid down seasonally whereas rhythmites usually form from large slackwater deposits from a flood or something like it -- large quantities of silts or muds sinking down to the bottom of a lake that didn't have much in the way of inflow or outflow for a period of time.