Figure F17. Occurrence of volcanogenic ash layers at Sites 1118, 1109, and 1115 shown in terms of thickness (gray pattern) and number of volcanogenic ash layers (black pattern) per core for Pliocene-Pleistocene time. Note: the spiky nature of the peaks of volcaniclastic input are in part artifacts of variable core recovery. Refer to the visual core descriptions for details of recovery (see "Core Descriptions" contents list).