Figure F3. Migrated multichannel seismic profile across the Middle America Trench and location of sedimentary (Units 1–3) and igneous (Subunits 4A and 4B) units cored during Legs 170 and 205 (Morris, Villinger, Klaus, et al., 2003). Note that part of the sequence at Site 1040 is underthrust beneath prism sediments. Unit 1 = diatom ooze with ash, Unit 2 = silty clay with ash-calcareous clay, Unit 3 = siliceous nannofossil-nannofossil chalk with diatoms. P1 = clay with intervals of silt to very fine sand.