GEOL 351 - #20 - Swauk Formation II
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- Опубликовано: 30 июл 2024
- GEOL 351 lectures from CWU's Discovery Hall by Nick Zentner during Spring Quarter, 2021.
Scientific Papers are here: www.geology.cwu.edu/facstaff/...
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As a retired middle school administrator, I observed and evaluated dozens of teachers during my career. It thrills me to watch in real time an extremely skilled educator such as you orchestrate a masterful lesson on a complicated subject. What a joy! By the way, I live within a half hour's drive of the Siletz River and the Mary's Peak remnant of Siletzia.
Two million years is a long time when you are talking about river directions. We have rivers that have changed direction in the last ten thousand years.
.. honestly am curious, what riverse have changed direction last 10,000 years? And do you mean just changed path or actually changed direction to flow opposite to earlier???? Most geology changes take 10my to happen, it is pretty slow, except I guess for Lavas blocking a river so I guess that can be 10,000 (but no big lavas in America since 10my ago New Mexico?).... Edit: I guess glaciers can block a river, but land slope n shape takes Million years to change so usually rivers barely change under 100k years,, , , but cld b wrong
Keep your home space seperate as a recharge place. Visitors could get tours from the Ice Age Floods institute or teams of grad students could lead teams of the public to interesting rock sites.
watching from a hospital bed, would not miss you for any reason. Whidbey Island, 74 yr old neuro psych
Feel better soon!
Dennis from Boise is listening to the recording today I was out hiking on our ancient sea coast yesterday!
we used a field guide in Idaho and Oregon to find the sea coast near Ola Idaho.
Gotta love it. Thanks Nick.
No Sir, Nick. You missed Patrick's point. You stated categorically that Sileztia ignited the Straight Creek Fault. But it doesn't take accretion of a young, buoyant exotic terrane to initiate right lateral faulting. The Cascadia Subduction Zone terminates into right lateral faults on both ends: the Queen Charlette Fault on the north and the San Andreas Fault on the south. Nobody believes the SAF was launched by accretion of an exotic terrane. It may be mere coincidence, but for all practical purposes the Yellowstone Hotspot was located right on top of the spreading center. In this case the accretion of the Hotspot and spreading center were one and the same. Patrick recalls from the reading that transform faults that segment the spreading center are just as capable of igniting right lateral faulting ashore in a case of oblique subduction. From the reading this is in fact currently occurring in Chile where the oblique subduction of transform and spreading segments continues ashore to this day.
Geology field guides - you gotta love 'em!
Nick - I noticed such stunning geologic features in the places Noraly is riding... did you know she has a MSc in Geochemistry?!?! Wow!... You gotta love it! : )
Thanks Nick! You mentioned a subducting spreading ridge @36:37 Naturally, I was hyper ventilating for a few seconds.
There is a common assumption regarding strike-slip faults that I don’t automatically subscribe to, and think complicates any presentation- that each side “moves in opposite directions.” IMHO, that would require some crustal accommodation on all four ends of the fault- extension on one side and compression on the other, and visa-versa on the other end, but without a mechanism for every side/end of the fault. I never see the other mechanism opposing the terrane presented, such as “X formation was thrusted and folded Northerly” with opposing arrows signifying the fault directions, but not explaining the mechanism for the other formation’s Southerly movement; many times, there isn’t any, but nearly everyone automatically assumes there is one.
A Strike-Slip fault doesn’t require opposing sides; a valid alternative that doesn’t complicate a fault presentation is varying momentums in the same direction. For example, formation X on the West side of a fault moved North 10mm’s per year for 7my’s, while formation Y on the East side of the fault moved North 0-1mm per year during the same period.
Our sandbox was the top half of an airplane gas tank, our wading pool was the bottom half. Boeing surplus. But both were rimmed with 2x4s to sit on and not get cut by the sharp edge. That was pre- turtle sandboxes. Turtles had lids that kept sand dry, and the cats out.
Nick, go back to your exotic terranes videos and re-watch where you crashed the round loaf of sourdough into the fruitcake. The whole grand circus played out in my mind when all the pieces of fruitcake moved. I could then visualize the whole fault ideas. Great video if you ask me.
those snickerdoodles are curiously arranged in an anticline fold in the box
38:00 i love the topic of spreading ridge subduction! I think it’s one of the most fascinating aspects of plate tectonics. would be curious to see if the plate kinematics allow for a spreading ridge to subduct under Washington when the Teannaway basalts and rhyolites were being formed. Good stuff!
Lol my sandbox was ocean beach sand from Oregon in 2 x 4's up on Lonesome Creek in the Blue Mts of Oregon. I guess it is still there. that was about 67 years ago.
Im at the first rerun ;D
Nice one Nick....good job and amazing cookies!
Thanks Ned!
The Cascades seem to be a young version of The Appalachians. Very complex geology.
In 76 we had a tide table the 60s we had Medow Land Diary
Ridgefield, Washington checking in.
What lovely gift, anonymous
live social and social media is two different things!
Would any of that "circus" stuff happened without Siletzia? by just moving west over the Farallon plate?
Yes Sir, Mr. Tony. Sileztia was co-located with and is one and the same with not only the Yellowstone Hotspot, but also the oblique subduction of the spreading center and its transform segments. They alone are more than capable of igniting dextral motion on the Strait Creek/Frazer River Fault, Leavenworth Fault, Entiat Fault, and others. It appears to be mere coincidence that accretion of the Siletz Terrane occurred with subduction of the spreading centers and its transform faults.
Jonathan
Seattle
Nick. Sir.. ihave learned a lots about our world from your live streams. WHERE DID THE WATER COME FROM ON EARTH? AND DOES THE OCEAN FLOORS FLOAT?
Would the West flowing rivers coming into the 'sandbox' from maybe as far as Idaho, only add lubrication and liquidity to the whole rift. I.e. the sandbox became a supersaturated sand/gravel area, easily shifted by the Siletzea collision quakes/afterquakes due somewhat to liquefaction?
The West flowing Rivers became reservoirs
How do the zircons in the Swauk date it? They may have been formed in another time and just mixed in.
❤
The Time of Siletzia - A Love Story - Season 1: Episode 20.
Dennis age 69!
AT 41:36 to 41:50.....TEACH IT AND THEY WILL COME NICK.
I’d have to say Melange vs Circus
I did not think I’d get to see a maskless university class this year! Glad not everywhere is anal about them anymore
Meanwhile, my uni made us wear masks outdoors, socially distanced, for commencement last weekend
No evidence of maskless. Distance to students with masks is implied.. earlier start up lectures explain the set up to comply with CDC guidelines.
@@barbaraburkhardt3047 Hi, Barbara. I think N8 Dawg is talking about the field trip, not the classroom.
@@lizj5740 no, I’m talking about the video above. Nick isn’t masked, so i presume that any student that did not want to mask was also unmasked
@@barbaraburkhardt3047 not necessarily. The professor kinda sets the mood of the class, so to say. We don’t see the students, so I can’t say whether they’re all masked. But, if i was in that classroom, I certainly wouldn’t be, as the professor is not masked either. It’s just a breath of fresh air to see people’s faces
@@n8dawg640 Nick wears a bandana, not so much for style , but if you have looked at past classroom videos you might have seen the size of the classroom , it is very large and allows good spacing for the 25 students in the class , classroom may have been designed for 100 to 200 students... Nick had his shots as have most or all the students in this class, they upper class geology majors mostly... In the old days Nick would allow "townies" to come and audit his classes... with the covid townies were told not to show up in class... ruclips.net/video/PQ2VjnlHRcc/видео.html Have you watched the introduction announcement? Nick is following the rules... he also volunteers at a vaccination center...
Sandbox bit....lol
Late to the party but I did make it.
I’d love to be back in school. But something tells me I wouldn’t just owe 20k after four years these days. I’ll know soon enough though when my oldest heads out in….what, good lord, 8 years!!!
Social interactions with viewers? I think better to keep it arms length, because once you start you can’t stop.
Nick is not been a logger he barely has an idea how to cuss,
... Nick is too nice, he should avoid spending time with geol tourists we would understand, and he has college kids paying $10,000 for education so better them even if they can b monotonous decades of teaching, and researchers. Broadcasting avoids most of this, unless one is too nice. Maybe alumni deserve a little more time .... And with respect the Roadside books probably teach best not a generalist like N. I prob am annoying tourist too in person so can say this ha.
Nick, Good job! I do have an issue with your increasing FOUL language. In any classroom, this is not appropriate. It should not be used in such a public form as this. It is not allowed, or tolerated in the Private business sector. Maybe you need to stop hanging out at the dive bars.
I noticed that too, about myself. Reducing dive bar attendant immediately. ;)