{
  "feature": "minecraft:disk_clay",
  "placement": [
    {
      "type": "minecraft:in_square"
    },
    {
      "type": "minecraft:heightmap",
      "heightmap": "OCEAN_FLOOR_WG"
    },
    {
      "type": "minecraft:block_predicate_filter",
      "predicate": {
        "type": "minecraft:matching_fluids",
        "fluids": "minecraft:water"
      }
    },
    {
      "type": "minecraft:biome"
    }
  ]
}