I think the cliff with the curved columns would almost certainly qualify as choss in most folk's view. The columns are narrow (less than 12" across) and not really connected to one another, so the outer layer can be dislodged with minimal effort.
Scott after reading some of your stories it makes me think you should go to South America. There's tons of mountain/jungle areas, big canyons with moss dripping off the rocks and rain every single afternoon for a couple of hours. Salto Angel in Venezuela is an example, just tons of crumbly rock and moss, leeches snakes and whatnot. There must be tons and tons of this kind of climbing, but people down there are just getting into the sport and this would not be their first idea.
Where I am in Colombia (note spelling please) is like that but flat. Here's a video of a mudslide on a road I've taken dozens and dozens of times. Its the only road to the uraba region, and 10 hours drive through the mountains from the nearest city, Medellin.
@Don - I may be crazy but I don't like to get dirty. No mud for me. At least in those portions. Me like no snakes either. I hear you got BAD snakes and other nasty stuff down there....You should come up here....it's safer.
Fire Spire climbed in my 100 Days project.
Credit: Plaidman
The Bump also climbed on the same day on day 40 or so in the 100 days project.
So Plaidman, where are those cool choss towers? Looks like the stuff I see in the cliffs above I-84 while driving down the gorge towards PDX. Always wondered if anyone had scrambled up there to check them out. Also wondered whether you could actually climb them without trundling something the size of a washing machine onto the interstate below...
Let us know!