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Unweathered, liquid oil.
Emulsified oil. An example of mousse is seen here as orange-brown oil coating cobbles.
Discrete accumulations of oil less than 10 centimeters in diameter. Shown are tarballs scattered on a sand beach.
Discrete accumulations of oil more than 10 centimeters in diameter. Here is a single black patty on a sand beach.
Highly weathered oil of nearly solid consistency. Here is an example of tar on a sand beach.
Non-cohesive, heavily oiled surface sediments, characterized as soft incipient asphalt pavements.
Cohesive, heavily oiled surface sediments. An example of asphalt pavement is seen here as a thick black deposit on a beach face.