Figure 12. A. Detailed seismic depth section, migrated before stack, and (B) its interpretation at Site 900. The probable detachment fault H subcrops just east of Site 900, which sampled highly deformed, amphibolite-grade gabbro with shear structures between 10 and 40 degrees. The detachment is overlain by a small lens of crustal rocks (Vp > 5 km/s), which is covered by probable early synrift sediment (Vp = 4.1 km/s).