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| The Charlie Brown outcrop. Welded tuffs insulated ash from a caldera eruption which enabled the ash to remelt and turn into obsidian. |
| Date: 2/17/08 11:28 AM | Resolution: 3264 x 2448 | ISO: 200 | Exp. Time: 1/250s | Aperture: 9.0 | Focal Length: 14.0mm |
| Total images: 121 | Last update: 2/20/08 9:40 PM | Help |