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ORSEL 103 - Welded tuff formation Leslie Gulch southeast Oregon.jpg
ORSEL 103 -  Towering rock formations with honeycombs are formed from compressed volcanic ash called Leslie Gulch Tuff, Leslie Gulch, BLM Area of Critical Environmental Concern, southeast Oregon, USA --- (4x5 inch original, File size: 6132x4800, 84.2mb uncompressed)