Wow, Arizona state has a great geochem program. I was in volcanology and igneous petrology but am now teaching community classes at Truckee Meadows Community College. I have been expanding the community field trip programs! (At the end of February I am leading a trip to Death Valley.)
The Petrified National Forest is a beautiful place, somehow though I never manage to get good photos either. Something about the scale maybe? All those petrified trees are fun to see though. Northern Nevada has a lot of petrified wood too, but not as colorful. Ours is mostly black and dark brown but with nice detail in preservation.
I was thinking about the color of the pink agate/chalcedony/silicate labeled petrified wood... It is the correct color for limb casts from Texas Springs, Nevada. Have you seen any of them? (Except that picture really, really doesn't look like a limb cast to me....)
