An uphill trail winds through jagged obsidian walls at the Big Obsidian Flow at the Newberry National Volcanic Monument in Central Oregon on a sunny day.

An uphill trail winds through jagged obsidian walls at the Big Obsidian Flow at the Newberry National Volcanic Monument in Central Oregon on a sunny day.

Photo by hddatmyers

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Stock photo: An uphill trail winds through jagged obsidian walls at the Big Obsidian Flow at the Newberry National Volcanic Monument in Central Oregon on a sunny day. was taken by hddatmyers on 14-09-2014 with OLYMPUS IMAGING CORP. model E-PM2 . DPI width: 350.0, height 350.0 . White balance settings: 1.