Table 4 Oxygen and carbon isotopic composition of the planktonic Foraminifera. Species Site depth "range," m Shell "length," ?m Shell "mass," ?g "?18O," ‰ PDB "?13C," ‰ PDB N. pachyderma (L) 121 km 200-400 177 1.1 -0.63 -0.06 N. pachyderma (L) 121 km 400-600 180 1.3 -0.02 -0.02 G. calida 572 km 400-600 271 1.7 0.09 0.07 G. calida 572 km 400-600 362 2.8 -0.7 0.35 G. calida 572 km 400-600 393 3.8 0.13 1 G. scitula 121 km 200-400 203 1.2 1.53 -0.28 G. scitula 121 km 200-400 300 3.4 2.04 0.07 G. scitula 121 km 200-400 290 3.4 1.84 -0.06 G. scitula 121 km 200-400 395 6.4 1.83 -0.12 G. scitula 289 km 200-400 300 3.4 2 0.08 G. scitula 572 km 200-400 223 1.6 1.56 -0.33 G. scitula 572 km 200-400 240 3.4 1.83 -0.11 G. scitula 572 km 200-400 295 4.4 1.3 -0.33 G. scitula 572 km 200-400 450 6.9 1.75 0.23 G. scitula 572 km 200-400 345 6.4 1.54 0.01 G. hexagona 572 km 400-600 224 1.7 2.05 -0.25 G. hexagona 572 km 400-600 255 2.8 2.08 -0.24 G. hexagona 572 km 400-600 358 7.8 2.25 -0.06 G. hexagona 572 km 400-600 415 11.8 2.07 0.02 G. hexagona 572 km 400-600 400 17.7 2.14 -0.01