Maps of (A) bathymetry, (B) depth to basement, (C) sediment thickness and (D) free air gravity anomalies for the study region. A location map is plotted at the top of the figure with the study area shown as the red box. On all of the study area maps, the locations of deep seismic profiles acquired over the margin are indicated with black lines outlined in white. Seismic line labels in (A) are from the Frontier Geoscience Project (F), from the SCREECH experiment (S) and from Lithoprobe East (L). Key bathymetric structures of the margin are labelled in grey on plot (A) as are the location of the Hibernia oil field (yellow star) and the locations of ODP drilling sites (red circles). The location of the Jeanne d'Arc Basin is shown on plot (C). Abbreviations: SNTM, southern Newfoundland transform margin; OK, Orphan Knoll.