Related Clues:

• Geological stretch
• Timeline segment
• Stat. for Greg Maddux
• Hurler's stat
• Historical age
• Time worth noting
• Chronological division
• Block of time
• 15-Across, e.g.
• Tide competitor
• Piece of history
• Bottom line?
• Distinctive time
• Cause for Steinem
• See 21-Down