| A black or very dark brown layer of oil. Depending on the quantity spilled oil tends to quickly spread out over the water surface to a thickness of about 1 millimeter. However, from the air, it is impossible to tell how thick a black oil layer is. |
| •owl:Thing |
| •amo:Object |
| •amo:Feature |
| •amo:MarineFeature |
| •amo:MarineArea |
| •amo:TimeDurationArea |
| •oilspills:Slick |
| •oilspills:BlackOil |
| •oilspills:RecoverableOil |
| •oilspills:BlackOil |
Class(oilspills:BlackOil partial oilspills:Slick
oilspills:RecoverableOil)