Cross references: Protobionts Last Universal (Common) Ancestor
Viruses Prokaryotes Prokaryote Colonies Mitochondria
Eukaryotes Eukaryote Colonies Slime Molds Metazoa
Ediacaran Period Pre-Bilateria Locomotion Parazoa Placozoa Porifera
1 billion to 542 million years ago.
This Wiki page has a very helpful graphical representation of the time span. Unfortunately, I was unable to copy-and-paste it. Click on the link. It's well worth it.
"The Neoproterozoic Era is the unit of geologic time from 1,000 to 542.0 ± 1.0 million years ago. The terminal Era of the formal Proterozoic Eon (or the informal "Precambrian"), it is further subdivided into the Tonian, Cryogenian, and Ediacaran Periods. The most severe glaciation known in the geologic record occurred during the Cryogenian, when ice sheets reached the equator and formed a possible "Snowball Earth". The earliest fossils of multicellular life are found in the Ediacaran, including the earliest animals."