Related Clues:

• History text topic
• It may have periods
• Feminist pitcher's concern?
• Ice is one, information another
• Geological time
• Geologist's time division
• Oft-nicknamed period
• Geological period
• Important time
• End of an ___
• Piece of the past
• Memorable age
• Napoleonic, for one
• Prominent span of years
• Low no. for Roger Clemens