As indicated previously, a variety of soil conditions was encountered. The soils of Eniwetok Atoll are basically similar to those of other islands in the Ralik Chain of the Marshall Islands. Held and others have commented on these soils for several atolls.3 "The parent material is primarily calcium carbonate, originating from corals, foraminifera, coralline algae and mollusk shells... In some areas, particularly along the seaward side of the islets, buried... horizons are formed as deep as 80 inches. These highly organic horizons presumably result from storm debris covering previously established soil and vegetations." Although these remarks, describe the relatively pristine conditions of Rongelap Atoll, they are certainly applicable to the majority of islets on Eniwetok Atoll. Modified conditions are found, as expected, on these islands on which testing and/or construction were conducted. Soil profiles observed on most of the islets consisted of a surface layer of vegetative litter of varied thickness followed by a somewhat thicker layer of dark coral soil containing some root structure, and other organic material. This layer also varied in thickness, being thicker on undisturbed islands and thinner or absent on disturbed islands. This second layer was usually followed by the basic coral sand structure of the island which prevailed down to the hard coral limestone bedrock. Buried horizons were. found at almost any depth. Coral fragments of nearly any size infiltrated the soils and could be encountered almost everywhere. The vertical distribution of radioactivity in coral soils has been the Sr. Eg. Held, S. P. Gessel and R. B. Walker, ATOLL SOIL TYPES IN RELATION TO THE DISTRIGUTION OF FALLCUT RADIONUCLIDES, University of Washington, August \ 1965, UNFL-92 (TID-4500)