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| Metamorphics like this gneiss were created 1.8 Billion years ago. The original rock that eventually became the gneiss probably formed near 2bya. |
| Date: 2/17/08 4:46 PM | Resolution: 3264 x 2448 | ISO: 100 | Exp. Time: 1/100s | Aperture: 5.6 | Focal Length: 22.0mm |
| Total images: 121 | Last update: 2/20/08 9:40 PM | Help |