G

1. Geochemistry:

   1. importance of sediments to, 947

   2. of the ocean waters, 219–222

2. Geopotential, 403

   1. anomaly, 409

   2. topography, 404

      1. illustrated, 454, 726

      2. of isobaric surfaces, 412–413

3. Glacier ice (see Icebergs)

4. Glauconite, 1035, 1036

   1. factors important to formation, 997

   2. frequency of occurrence, 987

5. Globigerina ooze (see Pelagic sediments), 305

6. Gradient, 156

7. Grazers of the sea, 884–886, 901–903

8. Grazing as a control of diatoms, 901–902

9. Gulf of California, 730–732

   1. lamination in sediments, 1040

10. Gulf of Mexico:

    1. bottom topography, 35

    2. currents, 642

    3. oxygen content, 641

    4. water masses, 639–642

11. Gulf Stream, 672, 675–680

12. Gulf Stream System, 672

13. Gulfweed (see Sargassum)