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Mount Harris is of basaltic formation, but I could not observe any columnar regularity in it, although large blocks are exposed above the ground. The rock is extremely hard and sonorous. - Charles Sturt Mount Harris is of basaltic formation, but I could not observe any columnar regularity in it, although large blocks are exposed above the ground. The rock is extremely hard and sonorous. - Charles Sturt Mount Harris is of basaltic formation, but I could not observe any columnar regularity in it, although large blocks are exposed above the ground. The rock is extremely hard and sonorous. - Charles Sturt