Neoproterozoic

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    


Neoproterozoic (Wiki) 
http://en.wikipedia.org/wiki/Neoproterozoic 
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.[1] The terminal Era of the formal Proterozoic Eon (or the informal "Precambrian"), it is further subdivided into the TonianCryogenian, 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.
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