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Honestly thought the whole 'glacial erratic' thing was just a fancy name for a random rock, but I found a massive granite boulder in a field in Iowa last month that looked totally out of place. A local told me it was dropped by a glacier like 15,000 years ago and now I'm obsessed. Anyone else have a story about a rock that made you believe something you thought was just a tall tale? | Geology Rocks - Librear