| Precambrian dome-shaped stromatolites from the Crystal Spring Formation, Inyo County, California. The green arrows point to the tops of the domed stromatolites; the specimens are roughly one billion years old, created by a species of cyanobacteria. |
| Precambrian dome-shaped stromatolites from the Crystal Spring Formation, Inyo County, California. The green arrows point to the tops of the domed stromatolites; the specimens are roughly one billion years old, created by a species of cyanobacteria. |