tag:blogger.com,1999:blog-6851578517872251953.post6537538443044580120..comments2023-10-10T05:07:13.577-07:00Comments on En Tequila Es Verdad: Pretty Rocks for KarenDana Hunterhttp://www.blogger.com/profile/00890312745525306991noreply@blogger.comBlogger2125tag:blogger.com,1999:blog-6851578517872251953.post-80190039093044995522010-08-10T13:10:03.837-07:002010-08-10T13:10:03.837-07:00If you get a chance go to Hells Canyon upriver fro...If you get a chance go to Hells Canyon upriver from the Dam and look below the columbia river basalts and you will see lots of chevron folds on small scales as the results of an island arc being overridden in the collision in E Oregon a long time ago. There and the second picture, are what I call unscientifically rocks that have been sat upon.Lylenoreply@blogger.comtag:blogger.com,1999:blog-6851578517872251953.post-17968241502215537372010-08-10T11:10:23.076-07:002010-08-10T11:10:23.076-07:00I think it's likely that in the first photo an...I think it's likely that in the first photo and Street View scene, that you're looking at welded tuff from top to bottom: the upper crudely columnar jointed orange brown rocks on top are moderately to strongly welded tuff, which is above the thin black vitrophyre (strongly welded tuff), which is above the white to buff moderately to poorly welded tuff in the roadcut. That's one cooling unit of a large ash-flow tuff. The andesite would then be a bit to the north.<br /><br />Of course, we'd have to take a field trip to find out for sure!Silver Foxhttps://www.blogger.com/profile/03131032620978696727noreply@blogger.com