Sarpeidon Ice Age
The Sarpeidon Ice Age was a historical time period on the planet Sarpeidon, roughly equivalent to the Earth year 2700 BC. During this period, the planet was glaciated and subject to extremely cold surface temperatures. 

Zarabeth was exiled there as a punishment by Zor Kahn. In 2269, Spock and Leonard McCoy were accidentally thrown back in time to this era by the atavachron. ()
Historical eras