Figure 3. Line drawing of the prograding sequences at the western margin of the GBB with drilling locations of Unda and Clino. Sequences h-a are late Miocene to Holocene in age. Miocene/Pliocene boundary is on top of sequence f. Sequence boundaries are indicated by truncations (sequences h, g, f) and/or onlap patterns (sequences e-a). Stippled areas are onlapping packages; white areas are prograding downlapping units.