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The remains of an undersea volcano some 20 million years ago.
Mountain biking at Russian Ridge Open Space Preserve.
| Carol Rollins | 13-Jun-2013 13:53 | |
| Graeme | 12-Jun-2013 13:09 | |
| Fong Lam | 12-Jun-2013 04:43 | |
| Dennis Hoyne | 12-Jun-2013 03:01 | |
| coaster | 12-Jun-2013 02:19 | |
| J S Quesada | 12-Jun-2013 01:13 | |
| laine | 11-Jun-2013 22:39 | |
| Chris Spracklen | 11-Jun-2013 22:07 | |
| Karen Stuebing | 11-Jun-2013 21:11 | |
| Walter Otto Koenig | 11-Jun-2013 14:50 | |
| globalgadabout | 11-Jun-2013 13:40 | |
| Jim Coffman | 11-Jun-2013 12:24 | |
| Hank Vander Velde | 11-Jun-2013 11:57 | |
| Mike H. | 11-Jun-2013 04:53 | |
| Tom Munson | 11-Jun-2013 04:52 | |
| joseantonio | 11-Jun-2013 04:12 | |