This is the kind of nerdy thing I could waste far too much time studying...
Thanks for posting.
I have that book, and have spent quite a bit of time in it. Probably not "too much" yet, so I'd better pull it out again.
I love maps, but not this one. To each his own. Nerds and rocks. A lethal combo!
Mmmmm.. that is interesting. It is amazing how these mountains formed. But, my man, you lost in some of those "rock' words. But, since you hike your butt off and take killer pictures, I'll forgive you...this time. Lol.