Assembling Oregon Geology, Sheila Alfsen, GSOC Meetup April 18 2020 "

[@jamesdriscoll_tmp1515]

"You have been watching Nick." Yes, Nick Zentner, really worth a look for anyone interested in Pacific Northwest Geology.

[@maryseeker7590]

Enjoyed this very much! Thank you!

[@neilt11]

I love that these people get together to discuss geology.

[@robsimer9296]

The Grande Ronde Valley in the Blue Mountains is a rift valley with an escarpment several thousand feet high. It's the 2nd largest fully enclosed Valley in the world.

[@trevorballard3417]

Thank you for sharing this. ❤

[@trupyrodice4462]

Amazing! Thank you for sharing!... altho I could have done without the dig sight starting at 10:25 with the gentle in the middle right, excavating a nostril and then eating its contents...

[@XJeepgirl]

You should test triangle lake rock slides and see if it matches, and also billings/gold beach for Columbia river basalts. Triangle lake rock slides are lava flows that form a waterfall and water slides. Shotgun Creek bed is lava flow also and contains gold quartzite. Worth checking out.

[@LHoover]

Baja Haha we got g'day mate......... just above our hollow earth door. All true excellent presentation rarely available. Thanks yall.

[@haplon33]

Thanks for the informative talk :)

[@micheleendsley3886]

What about the Eugene Formation? Ancient rock of external source.

[@jozander1498]

This is awesome! Thanks for sharing. 😁

[@JB-gw8ee]

Awesome thank you!

[@5USgRWFH]

Kula + Farallon motions = PNW clockwise rotation?

[@Steviepinhead]

Generally informative explanation, but the failure to incorporate the clockwise rotation left a large explanatory gap. Baja-BC movement in the late Cretaceous was sonehow conflated with much more recent movements on the San Andreas and Queen Charlotte-Fairweather faults. The Yellowstone hotspot track can be followed not just back down the Snake River Plains, but underlies the Steens and Columbia Basin lava flows and, even earlier, the formation of Siletzia. And the Josephine ophiolites are cognate with the Ingalls ophiolites, and thus may well be an example of "Baja" terrane in OR. Hard to fit all this into one hour, for sure!

[@ravingcyclist624]

Excellent !! Thanks

[@archstanton_live]

The title "Assembling Oregon" is clearly a homage to John McPhee.

[@phillipjacobson4457]

I still have a coffie can full of mt saint Helen's ash.

[@StBrush]

Oregon is just America's version of Italy.. especially Northern Italy. They don't mention longitude and latitude that kind of stuff.. good video but they still have lots to learn.