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@charliefite5143
Ай бұрын
@@shawnwillsey I live 50 miles south of Mount Shasta. I’ve been up to medicine Lake glass Mountain when I was younger with my dad he used to deer hunt that area when I was a kid. I’m 71 now too far back in there for me to travel or I would go take a look.
@vernowen2083
Жыл бұрын
Three years ago, I was exploring with my metal detector, around my Arizona campsite, along a wash, when I came across a bunch of obsidian flakes. Obviously, someone had been knapping at this site and recent flash flooding had exposed the shards of obsidian. What surprised me the most was that much of the obsidian was obviously not native to Arizona and after reporting the area to local authorities, who excavated the site, it was reported the obsidian was from New Berry crater, in Oregon.
@williamchamberlain2263
Жыл бұрын
Long distance trade can take quality materials a long way. _If_ i remember right, the neolithic trade across Europe and Asia Minor moved amber and lapis a long way
@muzikhed
Жыл бұрын
And mountain people used to interchange obsidian and chert etc for shells and the like from coastal tribes.
@baneverything5580
Жыл бұрын
I`ve found arrowheads here in Louisiana made of stone that we don`t have in the state. I wish I could have studied geology but mental problems basically crippled me in my teens and I never received treatment. But there are no treatments...just dangerous, sedating medications that make things worse and damage the brain and body. I saw an open box deal on a Minelab Vanquish 340 metal detector for only 170 and immediately ordered it. I found about 30 coins in my very trashy yard in about two hours with it. What amazed me about it is how it can accurately identify a quarter right beside a 6 inch rusty nail.
@gwynnfarrell1856
Жыл бұрын
The layers of obsidian and pumice are fascinating! I didn't know that the two could be found together like that. Amazing!
@YewtBoot
Жыл бұрын
Agree. A good example to illustrate the connectedness.
@coachhannah2403
Жыл бұрын
Yup! In the SAME ROCK! A creek runs nearby. I knocked a bit of shore into the water by stepping too close to an undercut, and the gravel floated away downstream... 😁 That was at Obsidian Dome near Yosemite.
@williamchamberlain2263
Жыл бұрын
@@coachhannah2403pumice is weird as heck
@garypasko5314
Жыл бұрын
So in the summer of 1990, I worked for the NPS in Lava Beds NM looking for Bald Eagle barf. The bald eagle was being delisted from the endangered species list and they were creating a management plan. Anyway, on a sunny day, you could look to the south and see Glass Mountain glittering in the sunlight. Really cool!
@dave9351
Жыл бұрын
Different Glass Mountain... California is a long way from New Mexico Bald Eagle Barf ????
@tomchambers1961
Жыл бұрын
I took that as National Monument Dave.....all fascinating!@@dave9351
@jamessmelcer616
Жыл бұрын
The N M is, National Monument not New Mexico. 🙂
@garypasko5314
Жыл бұрын
@@dave9351 NM is National Monument. They're actually called castings. Many birds of prey cannot digest certain parts of the things they eat. So they regurgitate, or cast it to the ground. However, nobody ever knew what castings were, but everybody knows what barf is. So just called it barf.
@markrothenbuhler6232
Жыл бұрын
No kidding Glass Mountain! It sounds like you are walking on broken glass the whole time. Great video!
@jackprier7727
Жыл бұрын
Thanks for showing all these igneous relationships basalt, scoria, then gas-glass and ooze-glass. Also, the footsteps sound extra-crunchy.
@pattilemonhouse7911
3 ай бұрын
"extra crunchy"🤭
@IndridCool54
Жыл бұрын
Very cool! And so young. I wonder about indigenous peoples recollections of this. There must be stories. 👍🏼
@DMLand
Жыл бұрын
The whole time prof. Willsey as walking around on that mountain of broken glass, I couldn't help but remember Jaime de Angulo's "Indian Tales" (1953) and the "Flint people," described as living "at the foot of Black Glass Mountain … made entirely of black obsidian." Indian Tales tells ancient origin stories of the peoples of the Pacific coast. Although I can't find it in my copy of the book, I seem to remember that the Flint People were described as making the sound we hear throughout this video as they moved and talked.
@jamessmelcer616
Жыл бұрын
Glad to see you in my neck of the woods Shawn! I am fourth generation Siskiyou and Modoc county native.( not Indian) In the summer of 1970 I worked on a fire crew at Lava Beds National Monument. In my free time I explored the area extensively, plus I hunted mule deer in this area. It is truly fascinating and beautiful,lots of lava tubes etc. Great post Shawn keep em coming!👍👏❤️😁
@shawnwillsey
Жыл бұрын
Lots more from your area coming soon. I did several videos at lava beds.
@skyedog24
Жыл бұрын
Well I got one out of two I know obsidian well my grandparents were RockHounds you would think I would have guessed pumice as well . The folds were the most amazing part of this video.
@briane173
Жыл бұрын
Indeed. I'm blown away by the layering of two such different rock types that _form_ so differently. The pasty nature of the flow promotes all the folding, but what's amazing to me is that the two layers are able to hold their composition even while in contact with each other.
@hanspeterplanzer1837
Жыл бұрын
Thank you. From switzerland. 🙂
@pattilemonhouse7911
3 ай бұрын
I was looking at that very steep incline, which can be challenging enough, but you're talking at the same time. Geology keeps you fit! 👍
@davidk7324
Жыл бұрын
Remarkable is right. Google videos of taffy pulling machines. I remember seeing them at the Idaho State Fair when I was a kid in the 60s. That's the metaphor that immediately sprung to my mind.
@levibranch7318
Жыл бұрын
What are the odds? I am from Utah and have been watching all of your videos enjoying all of them for the last two months. Trying to teach my kids about rocks and where and how they were made while driving Utah and Idaho. (Failing) Funny enough last night we drove to Sacramento though Nevada and up over Reno and Lake Tahoe. While on that drive my 9 year old asked what type all the rockets were we were seeing. My reply was oh man I haven’t watched one of Shawn’s videos of California yet too bad he isn’t in California with us. What are the odds? My 9 yr old daughter struggles with school but Volcanos and Mountains excite her and open a flood gate of hundreds of questions my wife and I try to google or learn from Shawn. Keep it up. Great content.
@Anne5440_
Жыл бұрын
Get her a children's book on Volcanos. Try the library in your area. Have the librarian help find books in the children's section. Then when she picks her favorite volcano books you will want to buy those. She will want her own copies. In future she may want to get books that are at older reading levels. Of course keep taking her to mountains and watching Shawn's videos. I discovered volcanos at age 5. I'm 75 now and am as passionate about volcanos today as I was at 5 years old. You're doing the right thing to encourage her. Oh also rock and mineral guides might help answering questions.
@nanasloves
Жыл бұрын
Go to craters of the moon! Later in the year when it’s not so dang hot. I loved walking in the lava tunnels.
@Anne5440_
Жыл бұрын
@garyb6219 that you. I agree Craters of the Moon, could be a nice vacation.
@shawnwillsey
Жыл бұрын
I agree with all the replies here. Best advice is to foster her interests and love of learning as best you can while you have this precious window. Once they turn 12, 13, etc. they change and lose or "bury" these interests through the adolescent years. Books, videos, museums, field trips. If you are in southern Idaho sometime, have her stop by and I'll chat with her and show her some fun rock samples. Keep encouraging her to observe the natural world, verbalize or record those observations, and ask questions. Science starts there.
@daphnewilson7966
Жыл бұрын
Sacramento to Reno: main answer: Granite! The great formations in Yosemite: granite, cut by glaciers. Over Donner Pass and down along the Truckee River, a mountain of volcanic cinders apparently being mined (?) and the dramatic rhyolite canyon down to Verdi. God Bless curiosity!
@jerrywills
Жыл бұрын
Fantastic! Really enjoy all you do! This one was, for me, terrific!
@GrandmasterBBC
Жыл бұрын
You're in the field video tours are amazing. What an incredible geologic playground.
@oscarmedina1303
3 ай бұрын
Thanks Shawn! Very enjoyable video. Now on my list of places to visit.
@Arcticfox7
5 ай бұрын
Absolutely fascinating 😮
@henrywelch7900
Жыл бұрын
Wife and I went to Newberry earlier this summer, when she sees this video we may be loading the car for another road trip
@shawnwillsey
Жыл бұрын
Look for a Newberry video in the coming weeks.
@lornaperryman489
Жыл бұрын
What a great lesson. First time I ran into your channel, won't be the last.😊
@shawnwillsey
Жыл бұрын
Welcome aboard! Enjoy the existing videos. Lots of choices.
@dontask8979
Жыл бұрын
The folded layers are awesome
@Rachel.4644
Жыл бұрын
The folds are just crazy....so clearly defined by the obsidian and pumice! Spectacular, Shawn. It looks sharp and tricky.
@kristinh9140
Жыл бұрын
Very cool! Thank you for sharing.
@nathanmarchant2175
Жыл бұрын
Great footage & comentary! Thank you for sharing your knowledge. I'm from Utah & have some nice pieces of obsidian in my front yard My mother used to take us to Glass Mountain when we would go to Medicine Lake
@ricksanderson4640
Жыл бұрын
Really interesting location, had no idea about the relationship between obsidian and pumice. Thanks for the work you do, really enjoy it
@surendersingal2192
Жыл бұрын
Thank you sir for showing this glass mountain. Looked rock for Fence building but there seems more to it glass n floatabioity. Good day jussojuan
@angusmorrison9433
Жыл бұрын
I'd love to have that initial piece of obsidian for my coffee table, and a few good pieces of pumice in my bath!
@lowellpearson8782
Ай бұрын
Wow so cool .
@LanceHall
Жыл бұрын
Cool place.
@johnschulte347
Жыл бұрын
Thanks!
@shawnwillsey
Жыл бұрын
Thanks for your kind donation.
@aubreyleonae4108
Жыл бұрын
I was privileged to study three years under a Dartmouth trained geologist in high school, at Henley HS in Klamath . He had a pregnant wife as he began his doctoral dissertation and took a job with USGS, never getting back to his PhD. I majored in geology at OSU, but paused to get married and never made it back. Oye vey. Love your channel so far. Thanks for your work.
@shawnwillsey
Жыл бұрын
Cool story. Thanks for watching. Glad you can get back to your geo roots.
@Eyebagdude
Жыл бұрын
I am a Henley graduate
@noel3422
6 ай бұрын
Hello Shawn, been there a few times back in the 90's, back then there was a road where you could drive up to the top in your car, giant chunks of obsidian on top.
@AhJodie
Жыл бұрын
Fantastic video, thank you!
@EloiseBarker-py9fh
Жыл бұрын
WOW Damn that is so cool. Thanks for showing all the beauty of geology.
@juliesiff1
Жыл бұрын
Thanks! That was AWESOME 😮❤
@shawnwillsey
Жыл бұрын
Thanks for your kind donation. Glad you enjoyed this amazing place.
@valoriel4464
Жыл бұрын
Grt geo-adventure. Thx Prof ✌🏻
@mickie7873
Жыл бұрын
Fassninating to see the folds of lava that had been flowing......and the inserts of Obsidian ot lava that had cooled and was exposed during the flow episode. Thank you for sharing on film this site!!
@genier7829
Жыл бұрын
This was great- I visited this place more than 50 years ago as a young girl and have wanted to return some day.
@craighoover1495
Жыл бұрын
I will always know pumice when I see it for I used to have to scrub a big flat grill in a commercial kitchen with it at the end of every day. It was remarkably consistent in texture and it would wear away with use. I had never thought until this moment how that it could be that that texture could be so consistent but perhaps in nature there are locations where it is uniform like that and it is mined. Perhaps it is artificially produced?
@rosemaryalexeev5319
Жыл бұрын
This is so, so cool - to see the obsidian and pumice together in this formation! Thank you for this information and video. Now I'm going to watch your other videos...
@shawnwillsey
Жыл бұрын
Awesome. Welcome aboard and enjoy the other videos.
@cw7429
Жыл бұрын
Great Video!
@toughenupfluffy7294
Жыл бұрын
The geologic formation of Big Rock Candy Mountain near Sevier would make a fascinating video.
@shawnwillsey
Жыл бұрын
Yes indeed. I'll add that to the list.
@MrStillracin
Жыл бұрын
Awesome
@patrickkillilea5225
Жыл бұрын
Awesome! Melted rock is the best. I was out exploring an area with similar geology... Pumice like stuff. All folded up, lots of Migmatite. No Obsidian though.
@cwj9202
Жыл бұрын
Driving along CA Hwy 139 east of Glass Mountain during the winter, many motorists refer to Glass Mtn. as the "Modoc glacier", because all the snow on the thick obsidian mass resembles a glacier.
@chucklearnslithics3751
Жыл бұрын
Boggles the mind. So the lava must have been "dry" to form obsidian, if I recall previous lessons correctly. Is it correct to assume the pumice gas is from materials in the granite, or whatever the source rock is made of, and not water? And how can the banding happen in the same material? Are the obsidian layers "fizzing" away their gas before they roll along?
@shawnwillsey
Жыл бұрын
Gases in pumice are mainly those trapped in magma/lava. As lava rolls over ground, water vapor can be added from soil or surface water. Gases move through lava although the viscous nature of these flows, inhibit much movement. Layers are mainly from gas-rich (pumice) vs gas-poor (obsidian) segregation as gases coalesce prior to (and a bit after) eruption.
@gerrycoleman7290
Жыл бұрын
You are not too far from some incredible supervolcano caldera features.
@davidemmons7154
Жыл бұрын
Tucker Hill is a rhyolite flow dome in Oregon north of Lakeview. The outer shell is perlite then obsidian and then glassy rhyolite. There was an open pit perlite in early 2000s.
@JAllenIsaac
Жыл бұрын
Fascinating area and great content!
@belindaeileen
3 ай бұрын
I spent more time there than i meant to one time, maybe 25 years ago. Locked my keys in the car while I was there alone. After 3 hours or so , a ranger or forestry or sheriff type came by and helped me break in, thankfully. I remember he picked up a piece of obsidian and warned me to be careful as he proceeded to accidentally cut himself.
@astromanian_UK
Жыл бұрын
Shawn, what an amazing trek... Your video quality is super. I wish we had such a range of volcanic deposits here in the UK. I'm so envious!
@hotrodmoma1
Жыл бұрын
When I was growing up my Dad told a story of a Mountain in California where you could pick lava rock of the side of the mountain. He brought back a good piece of the black lava rock. When he passed on I got it. It is flat on one side and kind of wavy on the other side and black and shinny.
@markwalker3499
Жыл бұрын
I am from northern California and when I was about 14 (1972)we were over at Lassen deer hunting and stopped at Glass Mountain. Back then there was no restriction on picking up a hunk or two of the obsidian. But, the last time I was there in 2010 there was not a whole lot of the glass left and warning signs to leave it alone. It is still an impressive deposit but nothing like it used to be.
@pierreproudhon9008
Жыл бұрын
Over here we had a fieldtrip to a little cone in the Mojave desert, there's a ton of cyan colored obsidian (though my classmates think they're more like grey),I did not believe those were obsidian at first!Looks like they can be several different colors.
@toad139
Жыл бұрын
We have a cabin at medicine lake and have seen glass mountain many times
@aubreyleonae4108
Жыл бұрын
At the entrance of the current pumice mine there used to be a small cabin where an old man lived in summer as he cut pumice bricks, sold for restaurants use on grills. Incidentally there was a brothel in Tionesta. My dad had to turn his head when they were driving by in his dads Model A Ford.. His dad was a pentacostal preacher from Westfir, OR. I can only imagine that scenario. Lol Nothing remains today of the milltown but Tionesta still has a store as far as I know, with many pictures of that day.
@Eyebagdude
Жыл бұрын
My dad was born in West fir
@daphnewilson7966
Жыл бұрын
Back in the day when nobody thought grabbing a souvenir was a problem, my family took a big chunk away from Glass Mountain. I still regret leaving it behind in my parents' yard: wonder if new owners have a clue....
@maurasmith-mitsky762
11 ай бұрын
Toothpaste analogy is useful. Thanks.
@shawnwillsey
11 ай бұрын
Glad it was helpful!
@johndefalque5061
7 ай бұрын
Ajusco in Mexico City, is very volcanic. Vallee de Tezontle-one cliff is red and the other is black pumice.
@georgesheffield1580
6 ай бұрын
There are big boulders and outcrops of obsidian in the Jemez caldera . House size boulders .
@outdoorfrenzy
Жыл бұрын
Has anyone been able to get into the pumice and see what kinds of gasses are trapped in there? The folds were absolutely stunning. I loved collecting obsidian as a kid.
@shawnwillsey
Жыл бұрын
Gases are released as the lava rises to surface so no gas trapped in the rocks at the surface (maybe at depth).
@outdoorfrenzy
Жыл бұрын
@@shawnwillsey I would have never guessed that. Thank you for the little lesson. Now I wish I’d taken more than one semester of geology in college.
@aubreyleonae4108
Жыл бұрын
My son and i built a snowman where you're standing in June one summer.
@KayJones-j2l
3 ай бұрын
In Attalla, AL there are place that have huge pieces of bright green glass. Down the road there is a limestone pit and the gravel that was mined has beautiful blue stone parts in the fossils. Can find no information
@jamesbond007ca4
Жыл бұрын
I know EXACTLY where that is. I've been there before & the last time I was there they were mining it!
@mt.sylvania9218
Жыл бұрын
Great video and great area, thanks! Medicine Lake and Newbrrry are so different being shield volcanoes, unlike the Cascade stratovolcanoes. Have you read Vic Camps paper “The Case for a Long-Lived and Robust Yellowstone Hotspot” that says seismic tomography shows ‘fingers’ of magma 75km deep reach out from YHS to Newberry and Medicine lake?
@CelticWa4rior
Жыл бұрын
There is a mountain north east of Flagstaff, Arizona called Government Mountain. It is made entirely of Mahogany and black obsidian. I have seen large slabs of obsidian there. It is crazy.
@shawnwillsey
Жыл бұрын
Yep, indeed. Lived in Flag for 3 years while at NAU. Awesome and diverse volcanics in the region.
@gerrycoleman7290
Жыл бұрын
There are areas toward the eastern side of Mt. Shasta that have pure obsidian flows. In those flows you can see tree trunk casts.
@shawnwillsey
Жыл бұрын
Wow, I'd love to know where those area.
@gerrycoleman7290
Жыл бұрын
@@shawnwillsey If you have an opportunity sometime take Hwy 97 out of Weed, California there is a large caldera shaped structure immediately east of Chemult, Oregon. It has been nearly entirely filled in. Further north you will experience the truly incredible Crooked River caldera, site of a massive super volcanic eruption. The caldera is 30 miles across if I am remembering correctly. If you stop at Smith Rocks and take the trail you will see limestone fragments in the rhyolitic cliffs. Bring your 1N Hcl to test it.
@jamessmelcer616
Жыл бұрын
Yeah,me too!👍😁
@gerrycoleman7290
Жыл бұрын
@@shawnwillseyI just stumbled on them years ago when exploring. Couldn't say exactly now.
@johnnash5118
Жыл бұрын
There’s more to creating obsidian than just rapid cooling of lava; if it were just the cooling process, the whole oceanic floor would be glass. Obsidian is produced from felsic lava (not produced on oceanic floors) rich in the lighter elements such as silicon, oxygen, aluminium, sodium, and potassium. It is commonly found within the margins of rhyolitic lava flows; these flows have a high content of silica, granting them a high viscosity (low fluidity.) The high viscosity inhibits diffusion of atoms through the lava, which inhibits the first step (nucleation) in the formation of mineral crystals. Together with rapid cooling, this results in a natural glass forming from felsic lava. This is how obsidian is formed.
@NickatLateNite
Жыл бұрын
Hey Prof... Would enjoy a Roadside-Roadcut series... Could you do it in different states in the west & mountain west?
@shawnwillsey
Жыл бұрын
Done! Check out the random roadcut series.
@henrywelch7900
Жыл бұрын
are the events that created Newberry and Glass Mountain related? They both seem to be from roughly the same period of time
@shawnwillsey
Жыл бұрын
Two different volcanoes, but similar settings as they both sit behind the Cascade volcanic arc and may be influenced by Basin and Range extension. They have both had "recent" eruptions of obsidian though.
@JaySmart-o1o
Жыл бұрын
Living in Bishop CA my first thought was you had visited Glass Mountain on the north edge of the Long Valley Caldera.
@shawnwillsey
Жыл бұрын
I'll be in that area in October.
@JaySmart-o1o
Жыл бұрын
Looking forward to it. @@shawnwillsey
@frankowsianik168
Жыл бұрын
This mountain is upscale and shows a lot of glass! 😉
@nikolaisprinkling
Жыл бұрын
Obsidian and pumice
@profsteve7653
Жыл бұрын
Sunset crater in the san Fransisco volcanic field in the flagstaff az area is am unbelievable site of nearly fresh rivers of frozen lava surrounding cinder cones giant car hood sized sections sharp as coral or razor blades
@RandomExitsJT
3 ай бұрын
So is the layering that you show between the obsidian and the pumice are those separate eruptions?
@lauram9478
Жыл бұрын
❤
@kenwilson3304
Жыл бұрын
Are there any examples of where a flow like this is currently erupting? I would love to see video of this kind of lava as it is emplaced and cooling.
@shawnwillsey
Жыл бұрын
The most recent similar eruption was the 2008 eruption of Chaiten in Chile. Here is some info: www.photovolcanica.com/VolcanoInfo/Chaiten/Chaiten.html
@unclvinny
2 ай бұрын
I had to rewatch to see if I missed it... but the obsidian/pumice folds all came out in a single flow of lava, right? That's how it was able to fold on itself like toothpaste? What I don't get is why there were layers that alternated between obsidian and pumice when it came out of the ground. It would make more sense if it was multiple flows over many years, but then I don't see how it would fold so smoothly without breaking. What would cause a thin layer of obsidian to be sandwiched between the pumice, and vice versa? Thanks! I love a good bit of completely alien-looking geology, and this definitely qualifies.
@stanlee2200
4 ай бұрын
SUPER NEATO DEESCHEETO
@nickmcginley4570
Жыл бұрын
That place looks really dangerous. Fall and get cut, or have something collapse under you, or fall onto you, etc.
@DanielFCutter
Жыл бұрын
Not to be confused with the Glass Mountains east of Mammoth Lakes, CA. Also a worthy destination for obsidian and and other leaverites…
@SteveAnderson-nv4gv
Жыл бұрын
Also, between Mammoth Lakes and June Lakes there is a beautiful dome of Obsidian, called Obsidian Dome. We live in Bishop and will plan a day trip to see what other types of rocks may be in the flow. Subscribed.
@grovedas
Жыл бұрын
Professor, your video is magnificent! However, I have a suggestion: Please hold your camera really steady, for several seconds, so that we can see what you're talking about. Thanks!
@shawnwillsey
Жыл бұрын
Yep. Noted and I'm working on it.
@jayesouthworth
Жыл бұрын
I guessed the two rocks correctly.
@CogentConsult
Жыл бұрын
Try to hold the camera perfectly still for at least 5 seconds when you are showing closeups.
@coachhannah2403
Жыл бұрын
Glass foam!
@ziggstah5307
Жыл бұрын
There is a place just North where you can find rainbow obsidian
@boossersgarage3239
Жыл бұрын
First, not really but I'm here for more fun....
@mawi1172
Жыл бұрын
❤❤❤❤❤❤❤❤❤❤❤❤❤
@Fairfield106
4 ай бұрын
Wish that you had explained why it's so broken up into smaller pieces now.
@kevindorland738
Жыл бұрын
Never knew obsidian and pumice formed together.
@alanrathmacher6736
9 ай бұрын
I'll ask again: Do you think the Medicine Lake volcano's plumbing is related to the Mt. Shasta volcano's plumbing e.g. magma chamber?
@shawnwillsey
9 ай бұрын
I don't know enough about these volcanoes to say for sure but most Cascade volcanoes have separate magma conduits.
@2ddw
Жыл бұрын
Why would the fundamentally same material have layers where there's lots of gas and layers with no gas? (I'm presuming that the obsidian doesn't have any trapped gas under pressure) It seems odd to me that gas, which is generally highly mobile would not mix more completely before being spewed out...
@shawnwillsey
Жыл бұрын
Gases coalesce to form gaseous zones in magma (pumice). Gases have trouble moving effectively through this highly viscous lava.
@deborahsimpson4968
Жыл бұрын
This is my second video of yours I've seen lately maybe ever. Both highlighted obsidian. Question for you. I was in the Beatty NV area exploring around. I climbed a Boulder hill riddled with natural caves. Toward the top I started spotting what looked like white obsidian chips of a wide variety of sizes and within the upper area a cave was awash in what I am calling white obsidian chips. What's the chances I stumbled on white obsidian in Beatty?
@shawnwillsey
Жыл бұрын
Hmm. Haven't heard of white obsidian. More likely it was a type of chert that also breaks similar to obsidian.
@deborahsimpson4968
Жыл бұрын
@@shawnwillsey via petrified wood I assume. "?" These were transported to the hill and tools were manufactured where they sat.
@deborahsimpson4968
Жыл бұрын
The Amargosa runs here along with that are lots of naturally percolating hot springs...
@peggieincolfaxca3818
Жыл бұрын
is it more likely to find obsidian and pumice in basaltic or in felsic volcanoes?
@shawnwillsey
Жыл бұрын
Obsidian and pumice are associated with felsic (silica rich) magmas (and volcanoes).
@1ntwndrboy198
Жыл бұрын
Is pumice basalt?
@shawnwillsey
Жыл бұрын
No pumice is silica rich so more similar to the rock rhyolite rather than basalt. Basalt with lots of gas bubbles (vesicles) is called scoria.
@Jeff-jg7jh
Жыл бұрын
Only 950 yrs. old? How did it get so busted up in such a short time? I know very little about this stuff.
@shawnwillsey
Жыл бұрын
It's at 8,000 ft or so in elevation so lots of freeze/thaw and other weathering processes. Plus as lava cooled, it fractured.
@anastash7900
5 ай бұрын
Nature’s hardware store for Native American tool makers.😊
@nikolaisprinkling
Жыл бұрын
Same element’s different temperature
@philbowflaggon8363
Жыл бұрын
Is it knap-worthy?
@shawnwillsey
Жыл бұрын
I wouldn't know but it looks like it is.
@pizzafrenzyman
Жыл бұрын
Do we have an idea of what this will look like in 1000 years? Will it be reduced to gravel?
@shawnwillsey
Жыл бұрын
It will continue to fracture and weather.
@aubreyleonae4108
Жыл бұрын
Its is my understanding that obsidian from the medicine lake volcano is inferior for tools and that Indiginous locals traded for glass from Newberry Crater. Perhaps water content? Also that glass from Newberry is found in the plains tribes. Memory is fuzzy.
@shawnwillsey
Жыл бұрын
I don't know much about the obsidian quality with respect to knapping.
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