8:20: for the summary, what is the sample (water or ice) from which you calculate H/D? thank you
@callanbentley3 күн бұрын
Either
@buturuscaАй бұрын
much appreciated to talk at the outcrop, it makes it so much more interesting
@allisondeanjonesАй бұрын
Thanks for sharing! Do you know if they will be offering other 2YC instructor expeditions in the future? Seems like a fantastic experience.
@callanbentleyАй бұрын
The word is, that they intend to offer 2YC instructor cruises every 2 years, alternating w/ HBCU instructor cruises. The goal with both is to nurture new local recruiters for students.
@user-iu2ce6ld1pАй бұрын
Great video thank you
@PlayNowWorkLaterАй бұрын
The measuring of Hydrogen isotopes is new to me. Makes sense. My understanding is what you mention later in the video, in measuring the oxygen isotopes stored in oceanic creatures, like diatoms, that use the oxygen available at the time to generate a shell. And then when that creature dies and it sinks to the bottom of the ocean. Over time you get ocean floor layers that are sometimes rich in Oxygen 16/18 alternating with ones that have lower in oxygen 16, as they have evaporated and been stored in ice sheets. Cool presentation though, much more thorough in the whole picture. Your students are lucky to have a teacher like you.
@PlayNowWorkLaterАй бұрын
That was such an amazing demonstration! Helped a lot by your explanation. I had no idea that was what the rest of a dike looked like. I drive by a few magmatic intrusions into granite canyons, darker intrusions that have a much finer crystalline composition than the surrounding granite. But yeah, all I see is the crack like feature as seen from the side. I am a total newb to geology, just do it for fun. Lucky to be surrounded by cool geological features. Granite. Basalt columns. An old volcanic vent. And even a moubtain littered with oceanic fossils. Realizing enjoyed stumbling on your channel. Cheers
@TheJhtlag2 ай бұрын
This is great, probably the "cleanest" description (sometimes cartoons serve their purpose) of how we arrived at the current formations around the Blue Ridge, to be fair I've heard bits and pieces of this story before but this helps tie my understanding together and will help me when I'm hiking sections including the AT and seeing greenstone, various Chilhowie formations and intrusive granite like at Old Rag Mountain.
@cxmeox43072 ай бұрын
thank you 💪🏼💪🏼💪🏼💪🏼
@kelp4est2 ай бұрын
Lots of good information in this video for depositional environments. Very helpful thanks.
@gwiz00422 ай бұрын
The peninsula rock outcrop tends to have a copper-color patina on it. Any idea what causes that?
@callanbentley2 ай бұрын
It's weathering (oxidation) of biotite rich layers.
@AntE-ox1qb2 ай бұрын
Are there any fossils present (ichnofossils maybe) to help further pin down the depositional environment? Or even to help with determining the age, or was there another way the age has been radiometrically determined if not relatively through fossils? First video i stumbled upon and definitely won't be last, keep up the good work! 😁
@joshc86712 ай бұрын
Typically, rocks of this age in the northeast have very good conodont time control. The Tonoloway has been well studied as the supratidal flats deposited as the Appalachian Foreland Basin began to flood via an ocean inlet south of the Taconic Mountains. The Helderberg Group, which overlies the Tonoloway represents this flooding as the Appalachian Sea expanded outward to the northeast/southwest from a central axis overtop of the tidal flats.
@callanbentley2 ай бұрын
@@joshc8671 Thanks for that great response. I'd add that what I see in this area in this formation is a ton of ostracod body fossils, usually in big death assemblages all on the same bedding plane. Not a lot of traces in this unit that I've noticed.
@A-K_Rambler2 ай бұрын
Thank you for Sharing!
@foxylovelace26792 ай бұрын
I thought you were a very big fish at first which I guess considering evolution is sort of true in a way
@foxylovelace26792 ай бұрын
That community college is lucky to have you
@VG-or1nu2 ай бұрын
Thank you for sharing your knowledge
@quakekatut86412 ай бұрын
Thanks for another field trip geo explain! I'm really enjoying experts getting out in the field and presenting "roadside geology" to the public. You, Shawn Willsey, Myron Cook, Dr Nat and, of course Nick Zentner are all doing some great outreach. I wish every state had an outreach expert, with their own YT channel.
@okboomer62012 ай бұрын
First! 🪨
@TheWestisBig2 ай бұрын
I’ve been looking for detailed info on glacier’s geology for year! This is great. I’ve made several video guides on GNP and want to add more geology learning. this will help a lot. FYI my GNP vids over a million views are you available to answer Qs? Or maybe even be interviewed via zoom? Could be good publicity for your channel.
@johnfaithfull81872 ай бұрын
Fantastic! 👏
@gregoryramsey71662 ай бұрын
Man, a night on KZbin is great stuff. I was very pleased to stumble on this.
@N7KOM2 ай бұрын
Very nice demo, Callan!
@quakekatut86412 ай бұрын
I never knew. I'll never look at a fracture the same way again! Thanks for such an informative presentation.
@joshward70092 ай бұрын
I was excited to actually know some of the stuff about the formation of the basement complex in this video. Looked at the channel name after I finished and realized you're the same guy who posted the lecture 11 years ago that I learned most of that stuff from. My professor has referenced those lectures several times, good stuff
@MarieJackson-sp3be2 ай бұрын
Thank you for this excellent presentation of the Precambrian sedimentation at Glacier Park. When I was in school, they pretty much skipped this part of Earth history. I was/am a sedimentologist, and your presentation was as good and being on a field trip. I've been looking for information on the geologic history of the park because I'm a retired geologist going there in July for a family reunion. They already told me they want me to tell them what was going on here when the rocks were formed. Thanks a lot.
@WhetStone-jl6nh2 ай бұрын
At roughly minute 20 he discusses two different ages in the same rock, saying that the younger one got raised to a temperature of about 400 degrees, no enough to reset the zircon and lead; but wait, how did the temp rise to in the 400s then? Does anyone know? (Enjoying your presentation Callan!)
@callanbentley2 ай бұрын
Metamorphism - mountain building, crustal thickening and deeper burial of this unit or else intrusion of nearby magma.
@chriscopeland13182 ай бұрын
Incredible. I deal with foundation performance on expansive clay in Austin. Cool geology there.
@RicArmstrong3 ай бұрын
During winter when its below freezing, the face of the cut is completely covered in massive ice sickles. I always live passing through this area.
@bobbyshaftowenttosea54103 ай бұрын
15
@AsgharAli-dz4nq3 ай бұрын
Brilliant
@nancytestani14704 ай бұрын
This is always so good. I keep coming back too him to listen.well spoken, not boring.
@Curated_Properties_Explores4 ай бұрын
Just found your VA Geology video a couple days ago and diving in on the others now. Learning so much about my adopted state's geology. Have been exploring creek and river beds and finding really unusual rocks. Some I've seen in WA state (granites) and others in Colorado and Utah along faults. But here, so many unusual types in a relatively small area that I feel driven to learn more! Thank you for all the informative videos on VA and West VA, etc. Looking forward to more as you explore!
@Casoooon4 ай бұрын
IM YOUR BIGGEST FAN CALLAN 😁😛
@callanbentley4 ай бұрын
Thanks for the enthusiastic support. However, it creeps me out that you are using my photo. Be yourself! (or at least, please don't pretend to be me.)
@Casoooon4 ай бұрын
@@callanbentley True, i changed it. Keep up the amazing videos though! ❤
@callanbentley4 ай бұрын
Thanks @@Casoooon
@Moon-qy1sn4 ай бұрын
this was such an interesting video! made it extremely fun to learn geology thank you!
@MochaQueen54 ай бұрын
Black people are carbon beings.
@macking1044 ай бұрын
I noticed they are sea floor mapping. It is so cool seeing how tall some of the mountains, volcanoes, seamounts are!
@dancooper85514 ай бұрын
What a cool experience!
@mavis554 ай бұрын
slay
@fantasmarosado4 ай бұрын
Great video!
@carlcarnein25694 ай бұрын
Sorry, I didn't catch a couple of typos in my post. I'm usually not that careless.
@carlcarnein25694 ай бұрын
Nice, quick presentation on the Appalachians. The only thing I would add is that some of us think gravity is the key to explaining Appalachian (and Himalayan) structure. During the collisions of Avalonia and Africa, subduction or "underplating" of contintntal crust thickened and (as a result of buoyancy) lifted up the "welt" and the overlying sediments that were originally the continental shelves. Uplifting and deformation of those sediments, and metamorphism of rocks caught up in the rising collision zone put stresses on them that exceeded their strength (just as is now happening in the Himalayas), and the "thrust" faults (actually huge gravity slides) moved off the uplift under their own weight. Those gravity slides formed what is now the Valley and Ridge and the Blue Ridge. As the effects of the collision died and the erosion of the orogen proceeded, the whole area "relaxed", with progressively decreasing uplift until buoyancy ceased to be a driving mechanism. I think too many introductory geology texts overemphasize the idea of rocks shoving eath other around--if that's all that was involved, the deformation zones would be muich narrower. Unfortunately, the term "thrust fault" implies some things that aren't really realistic (at least for the huge, low angle ones), when you consider rock mechanics. Also, plate tectonics itself is a response to gravitational issues--oceanic "ridges" are actually big, broad uplifts (the one in the Atlantic takes up about 1/3 of the ocean basin), off of which new, "hot" oceanic lithosphere slides away from the uplift under its own weight (as do nearby continents). When the oceanic lithosphere cools enough so that its density is greater than that of surrounding rocks, it sinks, again under its own weight, back into the asthenosphere, forming a subduction zone. At that point, especially if subduction occurs on both sides of the spreading ocean, the ocean may begin to contract, eventually closing as a competing ocean opens. This is a Wilson cycle (named for J. Tuzon Wilson). All of this may go beyond what your purpose is in this discussion, but I think it's important to the story as a whole.
@george54014 ай бұрын
God bless you man.
@meursault13694 ай бұрын
amazing
@Greebstreebling4 ай бұрын
Great the way it falls back to the original as the pressure is released, just like real strata.....:) :)
@sumanshrestha7525 ай бұрын
Can you Please further describe the change in the depositional environment by making a rough sketch or an animated video.
@sumanshrestha7525 ай бұрын
Very informative. Thank you for the insightful information it has added some knowledge. Would love to gain more knowledge from you.
@malcolmanon47625 ай бұрын
The Iapetus suture can be seen in the Isle of Man and in IReland near Shannon - where I grew up is the former ocean floor and volcanic island arc that outcrops, in hte Lake District.
@SiloSimon5 ай бұрын
Been really enjoying reading through the Historical Geology textbook on opengeology, thanks so much for the work you and all the others put into that! I was fortunate enough to take a class from Cameron Mosher at SLCC and it means a lot to have such an accessible source to learn about geology. Truly great stuff to read and study.
@karenhunt70355 ай бұрын
By chance do you do geology field trips on the east coast? I'd love to try one out...
@callanbentley5 ай бұрын
Yes, in the summer I run a series of one credit field courses through PVCC.
@TR-rx5ej5 ай бұрын
From where extra neutrons come into nucleus of carbon 13 and carbon 14?
@mikequinlan95855 ай бұрын
This is the best course on Virginia’s geologic history. I took geology in collage and this short video covered the subject much better than my teachers did.