29 of a mile in radius. If this removed material was completely and evenly deposited over the above area, the layer of mud would have been about .52 “eters deep. A second note concerning the post-testing sedimentary environments at Bikini and Eniwetok is one concerning lagoon silt and turbidity in the water column (Welander, 1966). He reported that the persistence of finely divided solid materials from the testing caused many areas to be extremely turbid even during the 1964 expedition to\Qikini. This was in spite of unusually calm seas at the time. Welander states at Bikini, the west reef of \Namu Is. had heavy deposits of silt near the crater area. Some silt was observed on the lagoon side of the Ailrukiiji-Eniman Island chains on the southern rim gf the atoll. The lagoon water near Bikini Is. was s@ turbid that visibility was reduced to ahout 15-20 Ft. and noticeable turbidity occurred on the lagoon sidel of Enyu, Reere, and Bokororyuro Islands. 9 During test ; ; 1 year after detonations in the (like Crater at Eniwetok Atoll» plumes of silt were seen dri Sag-west-oUtof_the-trateralong the lagoon reef towards and beyond Bogallua Island. There was marked turbidity as well as silt deposition on the reef and in the deeper water at various times and revealed by underwater observations. “ve only descriptive, this information serves to illustrate the extent to -" fine sediments produced by near-shore detonations in isolated regions ute c“ tte atoll spread throughout (at least) certain other near-shore areas. 3.€ Previous Radiological Surveys of Rikini and Eniwetok Atol) Sediments Despite numerous surveys of the Marshall Island environs (compre" ¥e Surrartes and detailed accounts of these expeditions can be found in Lt . . . . . #8, VSEC; Welander, 1966; Joyner, 1962; Donaldson, 1963; and Hines, 1962) vere ere only occasional reports of the concentrat ions of artificially introfee? recsolsotapes in the sediments of Bikini Atoll. Welander (1967) reported