157: this is what you need to know about Archean processes. p. 164-168: Most of what you need to know about Proterozoic rocks is here. What kind of sedimentary rocks are found in the Proterozoic? What ...

Earliest animals evolved in the mid to late Proterozoic Eon and lie deep in the fossil record. Please give special attention to the photo credit, as it is from a participating researcher not from ...