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Are most of the Tafoni/Honeycomb caves at Castle Rock (SP) too brittle to climb?
I’m mostly thinking about the main cave at Castle Rock Proper (next to Farewell to Arms), the steep roof in between Donkey Dong and Dismal Abysmal, or the cave to the left of Vicious Circles.
Check out the route Mulah on California Ridge for a good tafoni climb. Generally, the really intricate tafoni formations do not have established routes that climb through them, although they are climbable.