83 larger sized material. Sediments collected from stations B-19 and B-18 contained approximately 20-40 percent of pulverized material. All other sedi- sents contained widely varying proportions of fine material, but generally less than approximately 10-15 percent by volume. If the physical appearance of sediments which were collected by coring differed appreciably from surface sediments, these differences are noted in the text accompanying the discussion of the radionuclide profile with depth in the core. Two observations can be made regarding the distribution of pulverized sediments and the distribution of 23942405, for example. Sediments collected at stations C-5, C-10 and C-11 (S-16), which had much lower concentrations of radionuclides than did sediments collected at the nearby stations C-1, 2, 3, 4 and C-6, 8 and C-11 (S-19), respectively, also contained lower proportions of fine-grained components. Although similar correlations seems to hold for most of the sediments collected across the lagoon, there are three obvious exceptions. These exceptions occur for sediments collected from stations B-21, B-22 and B-24, which are located to the south and east of the area of high radionuclide concentrations measured at stations 8-2 and R-20. Station B-21 is located at the extreme southern end of the region of high radionuclide concentrations. The circulation of the deep water in this region of the atoll is not given by Von Arx (1954), but the finely divided sediments found here are similar in appearance to the sediments collected at stations B-2 and B-20. Even though both stations B-21 and B-20 have similar proportions of fine sediments, only about 23% of the 23942405, measured at Station B-20 was found at Station 8-21. In contrast, stations B-22 and B-24, which are located some distance downstream and to the east of the area of high 2394240, concentrations, contain low pro- portions of finely divided material (less than ~15%), but contain about 43 and 39 percent of 239+240 Pu measured at Station B-20.