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Although heavily mineralized, the rocks here were apparently brown and blue limestone, rather than granitics or metamorphics, including one boulder with this interested bubble-shaped inclusion.

E2_LimestoneBoulder.jpg (360 Kb) (under photos/25/0804-09_CabinElectricHorseshoeMtn/)

By Alan Silverstein, ajs@frii.com (page updated Tue Mar 10 18:16:39 MDT 2026)