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Posted in response to Mushroom Shaped Boulder from Aaron Dempsey on June 09, 2008 at 13:27:26:
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Here's my guess. I think it's sandstone eroded by rushing water. By the looks of it, your boulder was caught in a whirlpool and tiny pebbles and grains of sand were whirled around it by the circling water, much like a tumbler rounds and smooths stones. John
From John - June 10, 2008 at 08:07:52
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