12 RADIOLOGICAL CLEANUP OF ENEWETAK ATOLL Ceocal a v Ocean Level Reef > / - = STATE 1: OceanSotsey Coral reef begins mtne sorder of a volcanic ishand. VOLCANIC - T504ND Crustal Laver Coral Reef Lo Lagoon, N Ai — Deo4 7a Limestone Ocean Level [ Ocean Level STACE 2: Coral reef grows upward and inward as the original island subsides and/or the ocean Level crises. 27 Crustal Layer Exposed Limestone Island Ocean Leval Ocean Sottog Ocean Level Qcean Bottom a STACE 3: Ocean level subsides and/or island rises exposing the coral limescone to leaching, reccystaliza- tion and erosion. 7 “Crustal Layer Biken Is. Lojwa [s. tagooa ! Ocean Level Ocean Level éan Jocrom STAGE 4: Small tslands forms and coral growth resuses as ocean level rises and/or original island subsides. ORIGLNAL ISLAND a cae went se oe rts Crustal Laver ts 7 7 After USCS Professional Bapers 260-S (Riate) and 260-88 (Schlanger and others) FIGURE 1-17. EVOLUTION OF ENEWETAK ATOLL.