| 1 | He also thought stromatolites were organic in origin. | |
| 2 | As only one kind of fossil in Proterozoic, stromatolite is an important material in the paleogeography changing study. | |
| 3 | Stromatolites are formed by blue-green algae that excrete carbonate to form a dome-like structure. | |
| 4 | Rain water is leaching through the ground and the shells, dissolving out calcium carbonate and carrying to the stromatolites. | |
| 5 | So this is an important site where we can look at the circumstances in which stromatolites actually occur. |