Linked from
The 9 pages that link to Proterozoic, each with the reason it gives.
ArcheanRelated: Its beginning marks the Archean’s end and a major shift in atmospheric oxygen.
PrecambrianBroader topic: It is the final and longest eon within the Precambrian.
PaleoproterozoicNarrower topic: The Paleoproterozoic is its earliest era.
Oxygenation of Earth's atmosphereBroader topic: Atmospheric oxygen rose in stages through this eon.
NeoproterozoicNarrower topic: The Neoproterozoic is its final era.
MesoproterozoicNarrower topic: The Mesoproterozoic is its middle era.