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Limestone and marble underground formations in Oregon Caves National Monument. Eons of acidified groundwater have slowly etched away at marble, creating the extensive and intricate cave formations in Oregon Caves National Monument. USA
Stock Photo: 25861
Location: Oregon Caves National Monument, USA
Format: Digital 2:3
Copyright © Phillip Colla, all rights reserved worldwide.
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Keywords: cave, national parks, oregon, oregon caves national monument, usa
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