Related Clues:

• La Brea gunk
• Lenten symbol of penitence
• Pit sight
• Fire leftovers
• Bat wood, typically
• Roof covering, perhaps
• Highway sealer
• Eruption particle
• Mount St. Helens output
• Fire product
• Fossil repository, often
• Tray filler
• Pit contents, perhaps
• Pitch for the road crew?
• Surfacing stuff