Cryogenian Period

An age of planet-wide glaciations

The Cryogenian Period is the middle Neoproterozoic Era was preceded by the Tonian Period and followed by the Ediacaran Period.

Geologic Age


What happened during this time?


Large-scale glaciation events

Snowball Earth hypothesis (Kirschvink 1992)

Supercontinent Rodinia breaks up (~700 mya)

Above: Reconstruction of Earth during "Snowball" event

Above: Testate amoebae


Additional Resources