. Ecological study of the Amoco Cadiz oil spill : report of the NOAA-CNEXO Joint Scientific Commission . FIGURE 5. Known coastal areas of oil accumulation in sediments BAYS OF MORLAIX AND LANNION (JULY 1978 TO FEBRUARY 1979) A survey was undertaken from July 1978 to February 1979 to follow oil degradation within bottom sediments of the Bays of Morlaix and Lannion. In August 1978, specific sampling of some stations was made by the BRGM (Bureau de Recherche Géologique et Minière). At these stations (Fig. 6) , several-meter-long cores were taken by vibracoring to ascertain the vertical distributi
. Ecological study of the Amoco Cadiz oil spill : report of the NOAA-CNEXO Joint Scientific Commission . FIGURE 5. Known coastal areas of oil accumulation in sediments BAYS OF MORLAIX AND LANNION (JULY 1978 TO FEBRUARY 1979) A survey was undertaken from July 1978 to February 1979 to follow oil degradation within bottom sediments of the Bays of Morlaix and Lannion. In August 1978, specific sampling of some stations was made by the BRGM (Bureau de Recherche Géologique et Minière). At these stations (Fig. 6) , several-meter-long cores were taken by vibracoring to ascertain the vertical distribution of oil in sediments. Oil Pollution in Surface Sediments The sedimentary description of sediments collected from July 1978 to February 1979 is given by Beslier (1981) and Beslier et al. (1981). The weathering of hydrocarbons in some polluted samples was studied by Boehm et al. (1981). In July 1978, the hydrocarbon concentrations (determinations made on purified organic extracts) ranged from 8 ppm to more than 1,500 ppm. Average concentrations are presented in Table 1. Complete data are given by Marchand and Caprais (1981). We (HC/OC) also used the parameter of total hydrocarbons/organic carbon sediments. This ratio and Roucache (1981) showed in a study of another oil spill in Brittany (BOHLEN wreck) that a to demonstrate pollution of surface (HC/OC x 10 ) ranged from 48 to 6,065. Marchand 147
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