XIV THE OCEAN FLOOR 



15. Progress in length of sediment cores 36 



16. The "Albatross" under sail 39 



17. The course of the "Albatross" 40 



18. Diatom ooze 49 



19. Radiolarian ooze (radiolarit) 50 



20. Manganese nodule halved (Koczy) 51 



21. Distribution of pelagic sediments (Sverdrup) 53 



22. Weibull's scheme for reflection measurements 56 



23. Diagram from Weibull's measurement 57 



24. Sediment thicknesses found by Weibull 59 



25. Model from Cloos' experiment 68 



26. Corer bent against lava bed (Eriksson) 73 



27. Ash rain over the Tyrrhenian Sea 78 



28. Deep-sea core from near Cyprus 80 



29. Diatoms from the spring flowering 83 



30. Radiolarians from Pacific depths 84 



31. Tooth from giant shark (Challenger Reports) 85 



32. Vertical circulation near the Equator (Defant) 91 



33. Sand from the Romanche Deep (Locher) 95 



34. Stratified cores from the equatorial Atlantic 



(Mellis) 96 



35. Submarine weathering (Mellis), plagioclase to 



orthoclase (Mellis) 99 



36. Abrupt drop in number of radiolarians (Riedel) 107 



37. Lime and manganese distribution in sediment core 



from the Romanche Deep ( Berrit ) 110 



38. Equipment for radium measurement (KroU) 117 



