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| One of the most unusual formations that we saw. This is Grotto Geyser - its interesting shape is believed to be due to geyserite deposition on tree trunks ("Geyserite is a form of opaline silica that is often found around hot springs and geysers" -Via Wikipedia). | 2015_09_18_Yellowstone-10576-Edit1000.jpg |
| Photographer: Hali J. Sowle | Camera: Canon EOS 5D Mark III | Date: 9/18/15 4:25 PM | ISO: 640 | Exp. Mode: Aperture priority | Exp. bias: 0 EV | Exp. Time: 1/250s | Aperture: 13.0 | Focal Length: 35.0mm | Flash: No | Lens: EF16-35mm f/2.8L II USM |
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