Nature, 411, 1034–1037 (2001).

Figure 2 inadvertently contained plotting errors for oils from the Tampen Spur and Viking Graben data sets and the plotting of pristane/(n-heptadecane + pristane) for the Barents Sea data set rather than pristane/n-heptadecane as described. The corrected figure is shown below with all the offshore data now correctly plotted as depth from sediment surface. The shallowest Barents Sea sample plots with pristane/n-heptadecane slightly greater than 1, but alkane, isotope and light hydrocarbon distributions suggest that this oil is not biodegraded. Reservoirs in the Barents Sea cooler than 80 °C at present are found at depths shallower than 2,000 m. Our conclusions remain unchanged.

Figure 2
figure 1

Degree of oil biodegradation, assessed by the pristane/n‐heptadecane ratio, as a function of current reservoir depth below sediment surface for oils from four different settings.