Related Clues:

• Bygone pol. cause
• Victorian, for one
• Cause that NOW championed
• Procter & Gamble detergent
• One billion years
• Time in history
• Ages and ages
• Mesozoic or Paleozoic
• Interminable time
• Victorian ___
• See 36-Across
• A long time
• Depression ___
• See 35-Across
• Pitcher's stat