Limestone and marble underground formations, Miller's Chapel grotto 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. Oregon Caves National Monument, Oregon, USA
Stock Photo: 25864 Location: Oregon Caves National Monument, USA Format: Digital 2:3 Copyright © Phillip Colla, all rights reserved worldwide.
Keywords: cave, national parks, oregon, oregon caves national monument, usa |