Proterozoic occurring between 2500 Ma and 1600 Ma (million years ago). This is when the continents first stabilized. This is also when Cyanobacteria evolved, a type of bacteria which uses the biochemical process of photosynthesis to produce energy and oxygen.
Corresponds to "Precambrian X" rocks of older North American geology.
This category has the following 4 subcategories, out of 4 total.
Media in category "Paleoproterozoic"
The following 36 files are in this category, out of 36 total.