GEODES! What they are, how they form, and more with geology professor, Shawn Willsey

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Geology professor Shawn Willsey stops along US 93 near the Idaho-Nevada border to explore fist-sized geodes, both weathered out of the rock and still embedded in the rhyolite/vitrophyre that they formed in. Learn more about how these fun geologic features form.
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Shawn Willsey
College of Southern Idaho
315 Falls Avenue
Twin Falls, ID 83303

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6 ноя 2022

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Комментарии : 117

@wordswords2094 4 месяца назад

Excellent! Thank you so much for going Old School and using actual pen and clipboard and no music and just a single take. It was all about the information, no strings attached. New sub here for sure!

@shawnwillsey 4 месяца назад

Glad you like my simple style. Thanks for the sub and enjoy the existing videos.

@Rachel.4644 Год назад

Well, that is fun! I was given a few sliced pieces; now I see how they formed. I appreciate your enthusiasm and teaching, Shawn. 👍🏻❣️

@music100vid 4 месяца назад

To me geodes look prettiest when cut with a rock saw and the cut faces polished. Plus, if you cut down the middle, you'll end up with two beautiful and interesting specimens!

@brentlacey4214 Год назад

Thanks Professor Shawn. I am a retired geologist and did not know how geodes were formed. From Canada but winter a fair bit in AZ. We absolutely love the drive and geological sites from Montana through Idaho, Utah, and Arizona. Always looking for interesting and unique things to see and do. You are adding a lot of things to our “to experience” list. Thanks

@glenwarrengeology Год назад

Well we can not know everything.

@GaryCBenson007 7 дней назад

Thank you Professor. Old timey rockhound here. I do not know if this is true or not, and I don't know where to find out, but some rockhounds say that the difference between a geode and a thunderegg is that geodes form in basalt flows and thundereggs form in rhyolite flows. If that deposit is the one I think it is, the chalcedony flouresces under blacklight. I know of people who hunt that deposit at night with a UV light.

@Mchelle021 Месяц назад

I can recall, as a child, coming across geodes as a fun activity item in shops; I guess they can still be found in rock shops. So interesting and more meaningful to see them in context. Love to see your notebook/clipboard show up in the wild. I appreciate how you use traditional and technological depictions very sensibly, Shawn. You are such an effective instructor.

@oldtop4682 6 месяцев назад

When I was a kid in No. Utah there was a place I could grab calcite and mica geodes about 10 miles from our house. You had to know where to look, and the outcropping wasn't very expansive. The calcite versions aren't prized much by rock hounds, but are a pretty cool display item. These generally weren't perfectly round as they formed a bit differently, but I liked them.

@user-wk1mw9nj3i76 Месяц назад

I’m amazed to see so many geodes, still seeming like bubbles rising to the surface of water, except they’re in old lava layers. That’s new info to this midwesterner. Very cool. 😊

@glendaglass7264 Год назад

Thank you for posting this! When I was a kid in the 1960’s my family and I used to go there on weekends and get geodes. There’s also good quality red and black obsidian close by. Very interesting area.

@LizWCraftAdd1ct 2 месяца назад

Always wondered how they formed. Thanks Shawn.

@j.c.linden Год назад

These geodes are very different than the ones in southern Indiana! The ones in Indiana are in limestone, and the layers are often deformed around the geodes as if they grew in place. They can have pointed quartz inside, be solid or filled with various microcystaline rounded minerals. No wonder western geodes tend to look different than midwestern ones.

@MrFmiller Год назад

You added to what I already knew about geodes. They are usually described in passing in geology presentations. You provided much more detail. I passed it on to my sons in Idaho. Thanks.

@sharonseal9150 Год назад

Interesting! I recall as a child going to Red Top mountain on Teanaway Ridge in Washington to hunt for geodes more than 60 years ago. I was pretty young, but my recollection is that we were searching for geodes containing the unique Ellensburg Blue agate. Now after all theses years I have some context to know more about how they formed. Thank you for this series on types of rocks!

@michaelmckeag960 3 месяца назад

Red Top Mountain, that brings back memories. That mountain figured in my transition from rock hound to mountain climber. The cusp must have been the summer of 1960. The destination in a prior visit to dig geodes became my first summit, in the company of two elderly members of the Seattle Mountaineers. I turned 14 that November, now old enough to enroll in the Mountaineers’ basic climbing course. I see that now there is a road almost to the summit. Back then we hiked in from Mineral Springs CG, at least that’s my sketchy memory.

@Danika_Nadzan Год назад

I had no idea this is how geodes formed! I've only seen the larger, pointed crystal, highly colored ones...do they form in a similar way? Your diagrams are always helpful in visualizing the process. Thanks for another great video!

@MountainFisher Год назад

I found a 120mm (4.5") geode, I won't say where other than New Mexico. No, not Rockhound State Park, but it is a nice place to go camping and rockhounding in the Fall. Anyway I took the geode to a Rock Cutter and Gemologist I'd seen before and who did very good work and was trustworthy. She bought the high quality rock from me for a decent price and I also haggled a beautiful one carat Marquis cut gem for my collection. I have some nice Montana blue Sapphires, NC rubies and aquamarines, Gorgeous green Demantoid Garnets, but only half carat. I have a lot of gemstones from the US that people are surprised come from here.

@ericjohnson1811 Год назад

This is great! Thank you!

@bottomup12 Год назад

Really amazing!

@sallyweiner4180 Месяц назад

So cool! Thank you

@bwc1007 Год назад

Excellent video- thank you for making it.

@w4lauppe Год назад

Very informative, thankyou!

@tommycrossman6297 Год назад

Great explanation, thank you.

@Helix-ge1ld Год назад

Beautiful geodes!!!

@NoOne-yt6yf Год назад

Thanks for teaching!

@stevewhalen6973 9 месяцев назад

Thanks!

@user-ox6ip8ie7d Месяц назад

I once visited Crystal Ball Cave. It was on a dirt road a few miles north of Baker, Nevada near the Utah border. It was a giant hollow geode with walls of feldspar that fluoresced in the dark. That was all old Yellowstone stuff, huh?

@marsharose2301 Год назад

Thanks, you have taught me how to recognize a lot f neat rocks! I’m so appreciative of you and your videos!

@oscarmedina1303 3 месяца назад

Thanks Shawn. Loved the video.

@muzikhed Год назад

That was a fun video. Nice to know how geodes form. Amazing place. I hope one day I am able to visit Idaho and check out some of these interesting locations Shawn takes us to.

@doylechalfant5733 Год назад

Thank you again for the video

@shawnwillsey Год назад

My pleasure!

@gsmith9531 Год назад

Been collecting them - never knew how they formed. Thank you for all your interesting "field trips". Please come on east and explain NY geology!

@Aventuranaterradapedrapreciosa Год назад

I learn a lot from your beautiful work with minerals.a hug and success

@ttonysbirds Год назад

Again thank you

@nitahill6951 Год назад

Very cool!

@GB-ew8wc Год назад

Thanks i will now spend more time looking along side the road for mineral treasures.

@DoNotEatPoo Год назад

Back in the 1980's when Wilford Brimley was 32, he discovered geodes in a swimming pool. Geodes have aging reversing properties.

@Michelle-ce1qh 4 месяца назад

lmao

@Mchelle021 Месяц назад

Hee hee. I literally have that movie on hold at the library right now. Look forward to seeing it again.

@ErrolMiller-ey3lb 5 месяцев назад

THANKS

@lynneallan8637 Год назад

WOW, we have been driving by that area for years and never knew. We will certainly explore. We think IMMG should make an overnight trip to have you take us on a little field trip. Keep up the great videos.

@Whateverhasbeenmynameforyears Год назад

Apparently thunder eggs are only volcanic in origin. So you can not have a limestone thunder egg but you can have a geode thunder egg. Geode is just an open interior with crystals that has a crust. This is my understanding. So this video is about thunder egg geodes.

@noeljohanson1979 Год назад

Excellent excellent EXCELLENT!!! I’ve read information on Geodes and most of the time the Etiology is Unknowable or disputed. THANK YOU FOR AN EXCELLENT DISCUSSION. NE Johanson, MD

@michaelnancyamsden7410 Год назад

Good teaching. Subscribed.

@jackripleymaddiero 9 месяцев назад

Thanks😊

@shawnwillsey 9 месяцев назад

Thank you!

@kellypeters8330 Год назад

Very cool

@marcialoofboro306 4 дня назад

Thanks, I have a few and was wondering how they formed.

@Yetibiker67 Год назад

Great to see your subscriber list continuing to grow Shawn!!

@shawnwillsey Год назад

Hey thanks. It has grown a lot this year, especially since May. I still have no clue which videos will be popular. It's been fun to share these cool stories and locations with people and I've got big plans for next year so stay tuned!

@jimmymcgill2557 10 месяцев назад

@@shawnwillsey currently up to about 4 hours of watching time so far so you've definitely gained a sub! lol videos are all awesome and easy to understand! now when i have a bad day of rockhounding and haven't found much if not anything at all its still enjoyable because even the boring rocks i would never take i now know what they are, how they came to be etc. thanks to your channel! and i love your passion, you must be a credit to your students! 👏🏻👌🏻⛏

@KA7EII 6 месяцев назад

Shawn, thank you for the excellent explanation of how these geodes formed! My wife and I went to Rabbit Spring yesterday and we found lots of geodes. I also picked up a lot of the broken pieces to run through the rock tumblers. We ordered your books too - should get them next week.

@shawnwillsey 6 месяцев назад

Awesome news all around. Enjoy the books!

@georgelaiacona111 9 месяцев назад

Geodes, and thundereggs, are a favourite. I'd love to find easy to reach places to collect them.

@shawnwillsey 9 месяцев назад

Good luck!

@hestheMaster Год назад

Go figure in a state right next door to me, Iowa, has a Goede State park. The state rock of Iowa is the geode. Just to the east of the Mississippi River you can also find them here in Illinois. So interesting to see these strange looking rocks (from a Midwesterner's viewpoint )Shawn.

@leslyrae6025 9 месяцев назад

I appreciated the thorough details on geodes. It added a lot to what I knew and makes me excited ti try to find some again and share the experience with my grandchildren. Any tips on areas they may be found up in the northern panhandle?

@VegasCyclingFreak 5 месяцев назад

That was fascinating. If you ever come to Las Vegas area, there is a very interesting place in the NW part of the city with strange inclusions and bands in the rock that might interest you.

@WildesCollections 16 дней назад

Bubbles ah... Very cool makes sense

@stephanieparker1250 Месяц назад

That shirt is epic rock nerd. I love it 🤗

@charlessoukup1111 6 месяцев назад

Ha ha recall as a little kid on our Michigan beach learning about all these rock types ..pumice floats, cool...and then this black shiney glassy stuff, I thought they were calling it "rocksidean".... : )

@kevindorland738 Год назад

S.E. Iowa, Farmington, Keosaqu, Des Moines River, area is known for massive quantities of geodes. A few houses are constructed from geodes. Am interested in your insight on Iowa geode formation.

@xcrockery8080 Год назад

I've always wanted to know how these were formed, thanks.

@chucklearnslithics3751 Год назад

Get the exact same thundereggs on the GC side of course. Put a blacklight on your specimens there. They'll likely have some cool greens and oranges too. Phosphoric material of some kind in there?

@7inrain Год назад

I have some stones which a friend brought me from the french coast (a bit south of Calais). They don't really look like the geodes you showed in the video. They are also kind of roundish and they have big vesicles in them but those vesicles are not round and more like wormholes. Their walls look like being some kind of Feldspar. The geological layman that I am would classify the stones as igneous. I still don't know how these vesicles formed but your video delivers a possible explanation.

@keithtaylor6069 9 месяцев назад

On a ranch in new Mexico is a place where there are marble sized rocks everywhere Can’t climb you fall. It looks like bubbles in lava. A lot are fused together in a bluff have you ever seen this

@NoOne-yt6yf Год назад

Ooh, nailed it at 6:55! I knew it was vesicles! I bet it will get vitrifiied and then there will be mineralized (silicaceous) ground water intrusion. Not bad for a college dropout that's a 48 year old supporting himself off a liquor store job!

@shawnwillsey Год назад

Awesome. Knowledge is power!

@shawnwillsey Год назад

You can support my field videos by going here. Thanks! www.paypal.com/donate/?hosted_button_id=EWUSLG3GBS5W8

@glitchyentity2117 Год назад

So many here in Kentucky.

@user-tm2qx5wv7p 5 месяцев назад

Very informative. Since the geodes are formed from contributions of fluids that passing through the rocks, where are the evidences of the channels that enable fluids travelling? Seems like the geodes in the video are isolated.

@Gizathecat2 Год назад

I have half of a huge geode with big well formed crystals inside. It came from the Midwest.

@guywhoisaguy67676 Год назад

Very informative video. Got a question,... When the lava is mobile and folds over itself leaving linier and wide spaces to harden instead of gas bubbles from within then begin filling in the same, Are these given the same label of geode or are they labeled something else because some have long and wide nooks and crevices that go from deep to thin sections because they are folds and not bubbles ? I've run across some recently in New England.

@burningchrome70 7 месяцев назад

Yep, would have totally thought they were some kind of eggs.

@JBaads Год назад

There's geode field near Orderville, Utah. The geodes seem much bigger.

@joaniewillow Год назад

thank you again. Just wondering if the geodes or maybe just the vesicles form at certain depths in the pyroclastic deposits.

@shawnwillsey Год назад

The vesicles can be at any level of the pyroclastic deposit but tend to be larger and more numerous near the top where there is less pressure of the overlying rock.

@Whateverhasbeenmynameforyears Год назад

I really was hoping this was about the ones that form not in volcanic rocks. There are other videos about the thunder eggs but there is not much on the other kind.

@rpug2920 Год назад

Shawn what years were you at Weber and NAU? It feels like deja vu as I got geology degrees from the same schools. Great times!

@shawnwillsey Год назад

Hi there. I graduated with my BS in geology form Weber State in 1997 and my MS in geology from NAU in 2000. Super proud of both schools and what they did for me.

@rpug2920 Год назад

@@shawnwillsey I'm classes of '72 & 74 respectively and what a wonderful time it was. Great people to work with.

@Don.Challenger Год назад

And we can see water would flow quite happily through that crumbly (crummy) ground material (that those geodes are formed in) even if subsequent burials heavily compress it.

@Don.Challenger Год назад

Question: Is the creamy nature of the quartz an indicator of the waters flow rate and the proportion of mineral dissolved into it? I'll boldly say that if the water was charged with many mineral types there would be more color to the geode's innards.

@shawnwillsey Год назад

The color indicates the impurities within the quartz (when it was in solution). This chalcedony is mainly creamy white to very pale grey and somewhat translucent so the silica-rich fluid was mostly pure.

@grumpy3543 Год назад

Thanks. I always wondered how they formed. So what caused those giant geodes that you see in rock shops that are like 6 feet long and filled with amethyst crystals?

@shawnwillsey Год назад

Similar processes but larger voids.

@EMES365 4 дня назад

Most of the geodesic open are either hollow or have water in them. I'm in the rust belt so I don't know if they formed here or were imported by man.

@3xHermes 16 дней назад

👍

@sstimac Год назад

It's only a thunderegg if the chalcedony is surrounded by rhyolite.

@user-wq3sy6rk1c 2 месяца назад

A good partial explanation. Bear in mind that it does not explain banded geodes or other unique types. Wanting to have one explanation does not make it so.

@ToddDoes 8 месяцев назад

Sell this shirt on your website, time for merch!

@shawnwillsey 8 месяцев назад

Here's where you can get it: www.trollart.com/product/ages-of-rock/

@erickborling1302 5 месяцев назад

Wear eye protection at least - whenever hammering on rock.

@funkyfresh1013 Год назад

why does the chalcedony form in a concentric ring, rather than just at the bottom of the vessicle?

@morganprimrose9205 Год назад

Good question, I’m wondering the same thing

@shawnwillsey Год назад

The silica-rich groundwater that forms the chalcedony fills the entire vesicle (it is well below the water table). Precipitation of the chalcedony begins on the wall of the vesicle, slowly depositing more material over time.

@funkyfresh1013 Год назад

@@shawnwillsey Thanks for explaining

@neilalexander2662 Год назад

Years ago a neighbor had acquired geodes in Missouri. They had oil in them. That's the only time I have ever heard of that happening. Any comments?

@shawnwillsey Год назад

I don't know anything about Missouri geodes. Sorry.

@hime273 Год назад

Did you witness your neighbor actually breaking one of the said Geodes, which had oil in them? If so, what kind of oil are we talking about? Was your neighbor perhaps simply bullshitting you, (If you didn't see the oil inside yourself)? Did your neighbor drill a small hole in the Geodes, squirt oil inside, and seal the hole to play a joke? Crude Oil isn't from fossils as we are told to believe, but is from minerals/rock subjected to immense pressures and heat under continental plates, and doesn't make sense that a Geode would in any way meet the criteria to form oil inside. Hence the reason why Crude Oil varries greatly in composition depending on the rock/mineral types in each location of Oil extraction. But we're told to believe that Oil is derived from fossils, and that Weather Modification/ Geoengineering are simply "Conspiracy Theory," so I guess I'm wasting my time.

@AKUSUXs Год назад

Thanks Shawn! I have some basalt rocks that I would like to understand how they were made. I've got some pics I could send, just let me know if that would be possible. 😁

@shawnwillsey Год назад

Sure thing. I’ll do my best. Get good pics if possible.

@jjwwqq Год назад

Don’t you mean that your truck is just a geodes throw away?

@charlessoukup1111 6 месяцев назад

Sir, is it true that Brown County Indiana is a hot spot for the "remarkable" geodes...empty space inside with large crystals formed? Different colors from the type of minerals encased? Cuz your hunting ground is NO WHERE near Indiana!!

@shawnwillsey 6 месяцев назад

Sorry but I don't know about geodes in Indiana.

@zmavrick Год назад

I was so disappointed. I Live in the Mid-west so ours are formed in Limestone. So the explanation doesn't help me understand how the holes were formed then another unknown to me mineral had to coat the inside of that hole for the crystals to grow on. The explanation was good in his context, but just didn't help me in our locality.

@shawnwillsey Год назад

I'm not familiar with midwest geodes but likely a similar process. Voids in sedeimentary rock (like limetone) are created by circulating groundwater through the rock. Later, groundwater with different minerals in solution passes through rock and precipitates minerals within the void.

@zmavrick Год назад

@@shawnwillsey Thanks

@DrGeorginaCook Месяц назад

@@shawnwillseyyes similar process for sedimentary - if you are ever in the UK please visit Castleton, near Sheffield/Manchester. Carboniferous limestones with local volcanic activity = geodes and mineralised veins are abundant. Fluorospar is famous here (Blue John) filling both. Also quartz, barite, calcite, pyrite, galena (lead mining historically) in the veins. There are 3+ cave systems you can go into and take a tour. Lots of rocks lying about to play with! Geology heaven!

@ronjlwhite8058 Год назад

Well dang...that was a great vid too. You got a pattern goin and I like it. Dan Hurd has some amazing vid of digging up and cutting all types of cool stones. He has a claim where he gets, what he calls "ocean picture stone". Getting you out there to explain how that happened would be epic!!!