Figure F4. Conjugate seismic reflection sections from the Newfoundland and Iberia margins, juxtaposed at Anomaly ~M1. Profiles are displayed north to south (top to bottom), and locations are shown in Figure F3B. Vertical exaggeration = ~12.5. On the Newfoundland side, sediments are shaded brown above basement and/or the intersecting U reflection; on the Iberia side, sediments are similarly shaded above basement. Top left: Simplified interpretation of SCREECH line 2MCS with location of Site 1276. Top right: Composite seismic section (Sonne 16, JOIDES Resolution, Lusigal 12, OC 103) along the conjugate Iberia drilling transect, adapted from ODP Leg 173 Scientific Party (Shipboard Scientific Party, 1998). Drill sites are numbered and lithology at the bottom of holes is indicated. Center left: Conrad multichannel seismic (MCS) line NB1 about 150 km south of SCREECH Line 2MCS, showing another view of Newfoundland basement structure and the overlying U reflection. Center right: MCS line IAM9 about 50 km south of Lusigal 12 off Iberia. Bottom left: Conrad MCS line NB19 in southern Newfoundland Basin. Bottom right: Conjugate MCS profile Lusitanie 86 over Tagus Abyssal Plain. Note the marked asymmetries in basement depth and roughness between the Newfoundland and Iberia sides of the rift.