Abstract
Transport , production and consumption of oil products in the North Sea are rapidly increasing. This leads to an increasing need for the tracing of sources to and distribution of petroleum pollution. In 1975 the amount of oil spilled to the North Sea and Northeast Atlantic was estimated to between 100 000 and 200 000 metric tonnes (t) per year (National Academy of Science, 1975). These spills produce tarry residues which can persist on the surface for up to 2 years (Smith, 1975). Pelagic tar lumps have been quantitatively surveyed in the North Atlantic since 1969 (Horn et al., 1970). In 1979 the Continental Shelf Institute of Norway made geological surveys in the North Sea area. The material for this paper was sampled on one of these surveys.
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