Related Clues:

• Important time span
• Admission restriction, usually
• Application form question
• Six, say, for a first-grader
• Archeozoic, e.g.
• Depression, for one
• 1970's-80's cause, for short
• Gay 90's, e.g.
• History text topic
• It may have periods
• Feminist pitcher's concern?
• Ice is one, information another
• Geological time
• Geologist's time division
• Episode