Folded and refolded rhyolite, Chiricahua Mountains, Arizona


I collected this rock in 1973 just outside of Chiricahua National Monument in southeastern Arizona, at a time in which I was directing geology field camp at The University of Arizona.  I like this specimen for it underscores the stiff nature of rhyolitic lava, and it is my very best example of refolded folds.

Age & Formation
Miocene rhyodacitic volcanic rock, ~27 Ma.