Related Clues:

• It makes up the school board?
• Shade of gray
• Fred Flintstone's boss
• List of names
• Thin layered rock
• It may be wiped clean
• Agenda
• One source of oil
• Roofer's material
• Roofing material
• Party offering
• Not exactly hard rock?
• Shingle material
• Candidate list
• Stratified rock