Related Clues:

• Geological cold spell
• Distinctive period
• The Pleistocene Epoch, familiarly
• Big chill of long ago
• Global warming threat, some say
• Memorable era
• Miocene, for one
• Movie with the tag line "The Coolest Event in 16,000 Years"
• Long period of time
• Notable time period
• Old cold time
• Cooling-off period?
• When the mastodon roamed
• 2002 film whose sequel is subtitled "The Meltdown"
• Frigid epoch