This is singularly the most eloquently informative distillation and exposition on the subject of chert I've had the pleasure to witness. Thank you.
@WarszawaScream
3 ай бұрын
My absolute favorite stones are all of the micro/cryptocrystalline variety (chert, jasper, quartz, agate, chalcedony) and this is the BEST video on the subject I have ever seen. Much love for the lesson, thank you for posting this for all of us to see!
@SwizZLe333
3 ай бұрын
finding tons of chert and flint and petrified wood on my property.....had the soil graded...well we got nice sandy draining soil here in Wisconsin....when I was young me and my Dad (God rest his Soul) use to walk the Field and find Arrow-heads......good stuff.....Great Information! thanks!
@kellyeverett7911
8 ай бұрын
You are awesome and I am so glad to have found your channel. I look forward to learning a lot from you. I wish that we had someone of your caliber here in northwestern California to teach about the varieties of chert and other cryptocrystalline quartz common to the region. Thanks for sharing your expertise!
@laurieowen8696
2 жыл бұрын
Obviously you are Gandalf of the Rock. Thank you for sharing your wisdom.
@bethrossiter1857
Жыл бұрын
you have an excellent teaching manner! thank you for sharing
@steveclark5357
4 ай бұрын
captivating, brilliant, thank you, subbed
@steveclark5357
4 ай бұрын
Oh I'm a knapper
@BonesFPV
8 ай бұрын
I really enjoyed this. Thank you.
@user-zx9ki8tk4r
11 ай бұрын
I love me some chert
@lambchop330
3 жыл бұрын
This is fascinating, David. I wish my brother, a geologist, was still around to see your videos. He would have loved them. Edit: I just found your photo gallery. Your Boley agate specimens are gorgeous. Mind blown.
@justjoe942
2 жыл бұрын
You just showed me examples of most of what I have on my picnic table. I knew there was a lot of Chert, I just didn't know how Chert formed; now I do. I now also understand why I have limestone ingots proportional to the chert nodules. If you could find the time, I posted a couple of short power point videos featuring some of the more interesting pieces I've found in the yard. I would love to know what I have and what else I'm likely to find. Thank you very much for posting this. This was exactly the first lesson I needed in understanding my deposits.
@spoon8782
9 ай бұрын
your narration skills are wonderful, as is this video! as a geology major in college, I'd love to see more videos on your favorite geological topics
@BirdWhisperer46
3 ай бұрын
Amazing, my skull is going to burst with stuff I never knew.
@justjoe942
2 жыл бұрын
This is what the internet was supposed to be about. I'm about to listen to an expert give a brief talk on Chert. I'm interested because I have a layer of fossil bearing Chert nodules eroding out of a little hill top on the property. I knew it was sedimentary, but was wanting confirmation on thinking that it had to be deposited in the calmest of waters. I'm curious: are my nodules from here, or were they transported in by flood, Tsunami or natural river meandering. This is the Arkansas River Valley region near Paris, AR: any of the three are possible and I'd argue that point with anyone. Anyway. I do go on. Have a good day and a better tomorrow.
@David_Goza
2 жыл бұрын
Small world! I'm from Clarksville, just across the river from you. A lot of the chert that I collect around here (central Oklahoma) is transported and of course very worn and somewhat altered. But what I really like knocking around in are the beds and lenses of chert that one finds in the limestone and dolomite farther north - around Eureka Springs and Harrison, for instance, some of my favorite chert-bearing units. There's very little chert in most of the in situ deposits in the Arkoma Basin area, since sandstone and shale predominate in the Paleozoic rocks of that area. If you get farther south in the Ouachitas, however, there's a lot of novaculite, which might be described as slightly metamorphosed chert. Some of it is quite beautiful.
@ralphwatson7036
Жыл бұрын
@@David_Goza I loved your video. Best explanation I've read or heard. I live in Hot Springs where we make really big of our novaculite and I was happy to see you mention it. I've recently cut and polished some small pieces and hope to do more. Thanks for sharing your presentation.
@jamesprout9412
3 жыл бұрын
Any time I see you with a 30 minute video I know I'm about to learn something.
@christiantelles3361
9 ай бұрын
Very interesting video thus topics help alot I've been finding agates that's from inside chert nodules
@rcflyer40plus1
5 ай бұрын
Super informative. Thank you sir!
@David_Goza
5 ай бұрын
You're welcome.
@canadiangemstones7636
Жыл бұрын
A wonderful collection, and excellent information, thanks!!!
@blindsquirrelrocks
2 жыл бұрын
Thank you so much for explaining the mineral composition of many of my new found rocks here in central Indiana! I have been collecting various chert specimens from the karst formation creeks and ravines on my property, and in quarried rock from the Bedford, IN region. Lots of limestone, of course. I am left in total awe at the sight of your cherts on display in this video, and I will look forward to more of your expertise and instruction!
@davidrosinsky9912
Жыл бұрын
NW Arizona is unbelievable in rocks and minerals. I love it
@hotimportknight
Жыл бұрын
Thanks for IDing the crinoid stem! I dredge for gold in Owyhee, Idaho (high desert mountain stream) and we find lots of interesting stuff cemented in the silicified layer of gravel under the creek about 3-5 feet (1 M) and try to punch through that and guess to where we might be able to reach bedrock, along the path where the gold would have traveled in the ancient canyons (13 million year old rhyolite flow from when the Yellowstone hot spot was under that plate). We haven't been able to find a bottom yet, but have gotten easily 15+ feet under the creek bottom and it just gets softer, and more of a white chalky soft stuff. The silica layer of 10+ feet were punching through is so hard at the top it's nuts! We use a pressurized water jet, and a hammer and pry-bar to smash it apart and suck it up. From what I can tell the bottom should also be the same as the canyon walls (rhyolite, brick red when weathered). Is that white layer just chalky sediment that formed under the silica layer, or the ancient sea bed under the rhyolite flow? I've always been curious and picked up all the obviously interesting minerals and rocks we come across. A bunch of nice Jasper chunks about 10 lbs each. lots of Chalcedony nodules and pancake seams. Hoping to find enough gold next month to be able to buy a saw. Also on a side quest to find anyone with a GPR near Boise we could use/rent to try and find anywhere the bedrock Is reachable without guess and checking one good attempt a season.
@melissapeterson4202
Жыл бұрын
So I just have to say you are very easy to listen to! Thank you for sharing!
@TheRogueRockhound
Жыл бұрын
nice work sir
@tinymetaltrees
Жыл бұрын
I enjoyed this a great deal. Thank you!
@aerynventress7702
2 жыл бұрын
Thank you for sharing this! I've been puzzling over the silicates myself lately and trying to classify some of my trickier specimens.
@travismorgan29
Жыл бұрын
Thank you for clearing up so many of my questions!
@jaysilverheals4445
4 күн бұрын
Sponges and other things that use silica always leads to the chert or chert nodules came from the sponges. But they use silica to make their skeletons so it begs the question that its most likely the chert almost like silica gel the silica came from the water which there is much washdown and sedimentation heavy in silica with no relationship to sponges. We have huge chert nodules that many call fossil sponges so it confuses everyone that chert means its a fossil of an animal which chert is very capable had there been zero life to form chert nodules by itself. I recently took pictures of limestone at the interface during the great dying where the sea levels rose from the heat melting all ice on earth. So those limestones are quite sterile yet the chert nodules were still there. The dissolved silica is complex but I think in the deep long term ooze could be like a colloidal solution in that the silica came together in a gel forming nodules. I will be uploading a video on chert and will throw in some nodules. also glass shelves--are long lived ocean bottom in which the water is so rich in silica that the items he mentioned make their skeletons out of it. So its which came first the chicken or the egg and I propose the silica was there first and the human mind then must apply fossils to it as the SOURCE of the silica its the other way around.
@gronk_
9 ай бұрын
Hell yeah 👍
@geoffgeoff143
Жыл бұрын
Flint is chert formed in chalk deposits. Agate is varigated chalcedony. Chert and chalcedony are not the same. Jasper is chert with clay inclusions, therefor a rock.
@TheRogueRockhound
Жыл бұрын
27:20 Ive never seen anything like that before. We have a ton of chalcedony and the likes here in Oregon but that specimen is something special.
@davidcurry9292
10 ай бұрын
I’m very familiar with the road cut on 62 hiway,west of eureka springs. Very informative, thank you!
@markfothebeast
2 жыл бұрын
The thing that got me interested in geology in my area (Western WI) is the Midcontinental Rift that I feel has left an impact along the Mississippi River valley. The Rock Elm meteorite impact has also had me interested. This area should be better investigated.
@Ifelta
2 ай бұрын
Could the pseudomorph at 20:00 be from a deposition layer that was exposed to freezing temperatures then then rapidly covered and/or backfilled with silica rich layer?
@David_Goza
2 ай бұрын
Interesting proposition! I can see the possibility.
@alexanderhammond5664
2 ай бұрын
Hey David, came across this video while trying to consolidate my work's chert lists. Do you have references for your video or any other suggestions for further reading on the topic? Much appreciated.
@David_Goza
2 ай бұрын
Thank you for your question, Alexander. My description of the material comes from the USGS website, which also includes some other information, and I've also made reference to information that can be found here: www.projectilepoints.net/Materials/Search/Oklahoma.html. My information about chert found in Arkansas is based both on long personal collecting experience and also this: www.ozarksociety.net/2019/03/chert-one-of-the-most-common-ozark-minerals/ I hope that helps!
@Ivan_1791
3 жыл бұрын
Hello David, this has nothing to do with geology but could I ask you some advice for a piece I want to compose? The ideas I have for it are very tricky and I'm not sure how I should come up with a balanced form. It is for a composition competition so obviously I won't ask you specific advice, but rather suggestions for a more a optimal way of designing the formal structure of a piece and be efficient when applying ideas to music (basically because I have very little time left). I hope I'm not bothering and that you are having a nice day, see you soon!
@David_Goza
3 жыл бұрын
Good morning, Ivan. I'll be happy to share some thoughts, and hope they'll be worth something. I just ran across this interesting piece, and it got my mind working: www.msn.com/en-us/news/technology/woolly-mammoth-e2-80-99s-epic-50000-mile-journey-retraced/ar-AANg2T1?ocid=uxbndlbing It may not be immediately apparent why this piece might be relevant to your question, but here's where I think the connection lies: Life can be seen as a journey. It's easy enough to see that if we're examining the clues left by an ancient pachyderm, but it applies to our lives as well - a fact that I see really clearly in the rear-view mirror provided by 71 years of age. So that's datum 1. Datum 2 is this: our arts reflect our lives, whether we will it our not. Art is our way of saying "See me. Hear me." When I was an oboist, I tried always to make that the basis of my understanding of how best to do my job. I tried to shape every note as a life metaphor: with a beginning, a development, a maturation, a decline, and its eventual disappearance into silence. It's easy enough to see how that approach could be applied to the shaping of a composition in performance - but how about the *making* of a composition? It seems to me that you have two possible approaches to entertain, starting with the ideas you already have for the piece: You can either start here and go there, or you can start here, go there, and come back here. A life's journey can be seen either way, but it only becomes art if it's distilled so that the essence of the journey is captured in the details. So what did the mammoth see during its 50,000 mile wanderings? Your ideas for the composition correspond to those sightings. Put them in order. Develop them so that a journey is apparent, either from here to there, or the alternative. And make sure your audience has some way of understanding the journey. How one does that, I couldn't say; but I believe a commitment to an ideal will in any event yield a good result, so, for instance, when the piece is finished, make sure your audience knows it's finished. When the piece changes direction, make sure it does so in an affecting and memorable way that the audience will have no choice but to drink in. Those are some thoughts off the top of a head that hasn't yet had enough coffee. I hope it's helpful, and I wish you all the best with this. I think you're fantastically talented, and sooner or later you're going to be noticed.
@Ivan_1791
3 жыл бұрын
@@David_Goza Thank you for the advice David, interesting comparison. I agree with the bit about managing to make other people able to understand what the piece is about; because one of my teachers when I was studying composition used to say there is no need to make the piece understandable to others, and I wasn't very convinced about that claim. My general idea for the piece was a conflict and redemption between old and modern styles. So it is kind of a thesis about how style is flexible and why it shouldn't condition the way you judge a piece, because it really baffled my mind how teachers didn't take me seriously simply because I liked and knew more about common practice music than avant-garde stuff (and I have ended trying composing an electronic piece just for the sake of trying it). I think overall modern composers are quite close minded when it comes to style, like if doing something that doesn't sound new would make a piece bad or make it unable to present interesting new ideas.
@David_Goza
3 жыл бұрын
@@Ivan_1791 This all rings sadly true, Ivan. I've encountered resistance from time to time during my short, not at all illustrious stint as a composer. What it comes down to for me is that, to paraphrase Jesus of all people, music was made for man and not man for music. (I don't know how to modernize that to make it more inclusive, but of course I mean it in a universally inclusive way.) In other words, if writing music is not giving you a thrill, spinning your wheels, blowing your mind, then what is the point? If you can't do that for yourself with your composing, you certainly won't do it for anyone else. Decades ago, Milton Babbitt scornfully asked (rhetorically), "Who cares if you listen?" He got hit from a number of directions with the retort, "Who cares if you compose?" Your project sounds fascinating. If you can fascinate yourself with it, I'll bet you won't be alone in the fascination.
@Ivan_1791
3 жыл бұрын
@@David_Goza Exactly, I also think a lot about the philosophy behind music and which is its purpose in society or for onself. Another funny thing my teacher told us is that we were there to have fun composing, but at the same time he was always saying how you can't use your ear to guide yourself because that won't let you free from the past. But if you don't even like how what you are composing sounds or if it even makes sense to your brain, who cares what mathematical procedure or algorithm you are using to create that piece? To me it feels like nowadays the concept of innovation and progress of music has lost its meaning and most people are finding new sound worlds without anything else meaningful to add. I didn't know that anecdote, pretty funny. I am not sure I will fascinate myself, most of the time I'm extremely critic with my work and demanding with myself. But anyways I will try to offer the best I can.
@silnod
2 жыл бұрын
Now sugar agate vs. milky quartz, if you may sir. Please and thank you.
@silnod
Жыл бұрын
@Stone Wonders try to repost this on his channel. You accidentally responded to my post. If you go back to his channel at the very top of the comments it gives you the promt to comment.
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