A patch of a black fossil fuel forming a film on the surface of water

Let's find possible answers to "A patch of a black fossil fuel forming a film on the surface of water" crossword clue. First of all, we will look for a few extra hints for this entry: A patch of a black fossil fuel forming a film on the surface of water. Finally, we will solve this crossword puzzle clue and get the correct word. We have 1 possible solution for this clue in our database.