what about glacial_epoch ?

[arademaker]

http://wn.mybluemix.net/synset?id=15255195-n

[alexandretessarollo]

The Pleistocene is known as the Ice Age (source: Wikipedia).

Our previous synset (from PWN) read:
w: Glacial_epoch
w: Pleistocene
w: Pleistocene_epoch
d: from two million to 11 thousand years ago; extensive glaciation of the northern hemisphere; the time of human evolution
hp: Age_of_Man
ihyper: epoch[1]

Our current synset reads:
w: Glacial_epoch
w: Ice_Age
w: Pleistocene
w: Pleistocene_epoch
d: a geochronologic epoch ranging from 2.58 millions of years ago to 0.011700 millions of years ago; distinguished by extensive glaciation of the northern hemisphere; distinguished by the evolution of anatomically modern humans
hp: Quaternary
ihyper: geochronologic_epoch
mp: Calabrian
mp: Gelasian
mp: Middle_Pleistocene
mp: Upper_Pleistocene

You are referring to this synset (which has not been changed):
w: glacial_epoch[1]
w: glacial_period
w: ice_age
d: any period of time during which glaciers covered a large part of the earth's surface
e: the most recent ice age was during the Pleistocene
hp: prehistoric_culture

The proper noun Ice_Age is the Pleistocene, the common noun ice_age may refere to any given period, including the Pleistocene.