Related Clues:

• Historical stage
• Ruth's was 2.28
• Unique stretch in time
• Paleozoic, for example
• --- of Good Feelings
• Several periods
• Period piece?
• Important historic period
• Geological time period
• Important time span
• Archeozoic, e.g.
• Depression, for one
• 1970's-80's cause, for short
• Gay 90's, e.g.
• Spam producer