Oregon Geology History

1dave misunderstood rock expert Awed by the Universe! Member since October 2013 Posts: 11,944	Oregon Geology History Jun 4, 2019 6:45:14 GMT -5 halitedigger and MsAli like this Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by 1dave on Jun 4, 2019 6:45:14 GMT -5 History in Map form www.oregongeology.org/pubs/ims/ims-028_72dpi.pdf
	I'm a ROCKOLOGIST ! My Published Books: 1936dave.freeforums.net/

Deleted Deleted Member Member since January 1970 Posts: 0	Oregon Geology History Jun 4, 2019 10:42:37 GMT -5 rockpickerforever, 1dave, and 1 more like this Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by Deleted on Jun 4, 2019 10:42:37 GMT -5 Those fault lines give a good idea of how the state is rotating. Looks like I'm sitting overlooking an old fault that connects with a recent fault across the road a ways.

1dave
misunderstood rock expert

Awed by the Universe!

Member since October 2013
Posts: 11,944

Oregon Geology History Jun 4, 2019 18:42:20 GMT -5

Quote

Post by 1dave on Jun 4, 2019 18:42:20 GMT -5

57 Ma A hotspot formed the Hawaii sized island of Siletz that crashed into and became the western part of Oregon 50 Ma.

As the continent continued to move over the hotspot, supervolcanoes began appearing above it, moving southeast through Tillamook(48 Ma), Madras (35 Ma) - Richardson Ranch! - etc. spouting up Thundereggs as it went, hit the Oregon/Nevada border for McDermitt(16 Ma), Owyheea(13), Bruneau (12 Ma), then northeast to Twin Falls (10 Ma), Spencer Opal (6 Ma), and present Yellowstone (0.6 Ma).

It is not done on it's back trail. 7 million years ago southeastern Oregon was blanketed with the Rattlesnake Tuff that has spheroids and lithophysae in it.

filepickup.wrd.state.or.us/files/studies/harney_gw_study/Selected_References/Streck_1994%20Rattlesnake%20Tuff.pdf

We owe a lot to Siletz!

Last Edit: Jun 4, 2019 19:03:45 GMT -5 by 1dave

I'm a ROCKOLOGIST !

My Published Books: 1936dave.freeforums.net/

halitedigger
starting to spend too much on rocks

Lost in the Mojave, Sierras or Itoigawa

Member since September 2013
Posts: 104

Oregon Geology History Jun 5, 2019 4:53:33 GMT -5 1dave likes this

Quote

Post by halitedigger on Jun 5, 2019 4:53:33 GMT -5

Thanks for posting this 1Dave. Just back from Japan and have Jet lag so nothing better to do. I'm a dealer in Japan and recently have been getting interested in the Owyhee Mountains, Spencer Opals and the various minerals up in Nevada, Oregon, Utah, Idaho & Montana. Awesome material.

Last Edit: Jun 5, 2019 5:09:33 GMT -5 by halitedigger

I should have been a geologist who moonlights as a chef in Japan....

« Prev
1
Next »

rocknrob: That was one heck of a windstorm that thankfully missed me. I guess Seatac almost hit 60mph gusts. I bet those were some fun landings Nov 20, 2024 21:55:16 GMT -5

Post by 1dave on Jun 4, 2019 6:45:14 GMT -5

Post by Deleted on Jun 4, 2019 10:42:37 GMT -5

Post by 1dave on Jun 4, 2019 18:42:20 GMT -5

Post by halitedigger on Jun 5, 2019 4:53:33 GMT -5

Chat Box v.2