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This is so interesting to me. I spend some time around the Salton Sea during the winter. Thanks.

Thank you so much Shawn very interesting leaning lots new information

So do basalt boulders that are tan really become the nice dark blue and brown with weathering... thats what my landscaper is telling me

That is a nice diagram and all unfortunately though from Nick Zentner's A to Z baja BC series it looks like the subduction zone around 100 Ma responsible for the Sierras was oriented the other direction origionally having been subducting the then likely passive North American passive margin underneath a volcanic arc analogous to the Australian continental shelf currently subducting into the Sunda trench. This eventually led to slab failure as the crust subducted became continental in affinity and ultimately led to a Subduction Polarity reversal during the late Cretaceous with the collision of the mature volcanic archipelago with North America leading to the Laramide stage of mountain building as the continent smashed into the mature oceanic archipelago also primarily of continental affinity. There is if memory serves evidence for subduction from both sides earlier on in the process but that if I remember correctly doesn't seem to have been the case in this part of Nevada/California having been more to the North(though it probably wasn't as far north back then) There is probably more complexity to the story which is only starting to come together.

At 19:00 the video for continent-continent collision, the mountains formed are labeled "volcanic arc". Shouldn't this be something like "high mountains"?

Excellent class. I so do look forward to these. And, I ordered the map for my studio ( $9.00 in US, probably cost a mint to laminate it. lol) . Cheers!!

Near the town of Shoshone (pronounced Sho-sho-nee) by Death valley there is a spectacular intrusion of Vitrophyre. I see geology students/tourists there fairly often.

Thank you! Very clearly explained. Happy to have passed the quiz. 😁

share

thanks

Regarding the subsurface geology. Dr. Valentin Troll, Professor of Petrology at Uppsala University, announced a paper he and colleagues published earlier today in the journal "Terra Nova" (Wilely, on an open access basis); the paper is called: "The Fagradalsfjall and Sundhnúkur Fires of 2021-2024: A single magma reservoir under the Reykjanes Peninsula, Iceland?" I'm not sure it's exactly what you're thinking of in regard to the subsurface geology (I think it covers a slightly different topic), but certainly its related and may overlap some. Professor Troll also has a RUclips channel (Val Troll's Volcano Channel) where he briefly discusses the paper and summarizes its findings.

I believe the crater of the moons park is part of the Yellowstone volcano and it shows the migration of the lava dome!

The website looks great and works really well! Thank you, Shawn and Amanda Jo!

Glad that we now have the dirt on what gets under Shawn's skin when people use dirt as a noun! The question now is: Does Shawn treat soil like dirt?

Shawn there has been much discussion about the so called lost continent of Zealandia in which case a large land mass has submerged deeply. It seems counter intuitive to lose a land mass rather building up more land like the Aleutian islands unless the ocean floor is sinking. Great thing for me to ponder I guess. Thanks for your online course.

Whew! Thank you.

I’m 65 but it’s never too late to learn! Thank you Professor!

Possibly the western part of Yellowstone national Park 🏞️?

Great episode.. I’m really enjoying these so informative thank you Shawn and enjoy your holiday

Thanks!

Thanks for your time and good updates. Excite to see you have a new website! --Enjoy your travels. Thanks you moderators.!

Thank you Shawn.

Thanks Shawn! Another great lesson!

There are a few places around the world where the direction of subduction changes over a relatively short distance. Why? (Credit to Kiwi geology channels raising my awareness of this.) The sudden-transition area seems particularly messy.

I’m always excited when you put out another lecture video. My dad served in the navy around the Marianas, so it somehow seems more personal to learn how those ultra deep ocean trenches formed. Thanks from Minnesota!

This was fantastic! Super fascinating. Thank you so much for teaching in such an easy to understand way. The illustrations are super helpful.

Vulcans said it would last till August..... in agreement.🙏 To Iceland!!

The map has become quite colorful. Looks like the uplifted area is almost complete, possibly a smidge more?

Is Iceland similar to Northern California? It has a tremors chart , Tetonic! It can go up to 1000 but recently has been closer to 500. It does go as low as 30's. Seems like more EQ are prominent in California during the increases

EQ increases to 75......30ish above a 1.0.

Iceland just had a 4.3 and 2.9 at Sig....

Very cool , got a new place to camp 🏕️!! I should pay you a touring agent fee !!!! Huh ? 🤔 do you give group rates to couples 🥸 ? Thank you ❤🎉😊

How do the Deccan traps fit in with the India/Asia collision, if at all?

Thanks 🙏 ❤coooool dude !

Thanks!

Can you share the .SKP or KMZ files on your new website pls?

Your website is amazing! Amanda Jo truly is the best! So cool you choose Germany for your trip, even more so the river Rhine. I've lived in different places along it, currently its Coblenz. The Rhine valley is very pretty, and im sure you will find some sexy rocks, especially more to the south😅

Thanks! That was Great!

Thanks!

Note that the main 4 islands of Japan are actually a continental oceanic convergence zone where a mature back arc basin has pulled the coast of Eurasia with it out to sea. Other parts of the Japanese archipelago are oceanic in origin but the 4 major islands of Japan are not. Frankly the geology of Japan is so complicated with at least 5 different tectonic plates; the Amur, the Okhotsk(former piece of North America), the Eurasian, the Philippian and the Pacific plates respectively, with every single kind of convergent plate boundary occurring in some shape or form within that tectonic mash up, that I would probably have just avoided bringing it up in a geology 101 lecture. I mean I know no subduction zone is as simple as those models of idealized subduction project but you still don't need to jump in with the hardest example first!

Hello and greetings Shawn from Kanab Utah ... Probably one of the most interesting and potentially significant geologic events in our lifetime is Campi Flegrei in Italy. If TPTB have instructed you to avoid this place, please just say "No Comment". I will understand your predicament. Respectfully, Utah Mike.

👍

Thank you Shawn , It looks like many Red Dots Man , Prayers .

Thank you for sharing this and I’m looking forward to that deeper dive into plate tectonics! With volcanism my favourite geo subject 😊

here comes the next ice age.

Love when a new Geology 101 video goes up. Does anyone else get the feeling Shawn is the professor everyone wants to get at his school?

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

Has that San Andreas fault ever have a full rupture if not why not thank you

Good Morning. Love the classes. Sugar Land Texas

Good morning from Santa Monica CA 🌴