West Oswegos has the most primitive biostratigraphic stone. Noto 1-3, those who are in a group, are hard to say that they are creatures, and they are not allowed to step on them. Is it not a stone, is it a stone? The stromatolite is made up of some microorganisms, especially blue bacteria (formerly known as blue-green algae), but in fact only a few ancient stromatolites contain microbial fossils. How to effectively identify biological and non-living stromatolites is one of the research objects of geology. There are many stromatolites formed on the Earth in the Precambrian. Some of the earlier (such as Taikoo) may be fossils left by single-celled blue colonies; later (such as seiyuu) may be eukaryotic The early form of green algae. The oldest blue-green stromatolite in western Australia is 3.5 billion years old. Well, thats the pile.