geological feature
Author:
unknown
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Representative image using: cave
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Representative image using: eroded surface
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Representative image using: clear shimmering vent
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Representative image using: block
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Representative image using: fissure
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Representative image using: fracture
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Representative image using: columnar jointed outcrop
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Representative image using: fault
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Representative image using: pothole
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Representative image using: drainback
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Representative image using: fold
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Representative image using: chimney