Figure 4. Depth ranges of key Pliocene-Quaternary planktonic foraminiferal zonal species and other stratigraphically useful taxa in Holes 1013A and 1013B, California margin. California margin (CM) planktonic foraminiferal zones shown at left. Cores 1H through 11X are from Hole 1013B, and Cores 12X through 16X are from Hole 1013A.