{
  "feature": {
    "type": "minecraft:ore",
    "config": {
      "discard_chance_on_air_exposure": 0,
      "size": 64,
      "targets": [
        {
          "state": {
            "Name": "minecraft:cobbled_deepslate"
          },
          "target": {
            "block": "minecraft:stone",
            "predicate_type": "minecraft:block_match"
          }
        }
      ]
    }
  },
  "placement": [
    {
      "type": "minecraft:count",
      "count": 256
    },
    {
      "type": "minecraft:in_square"
    },
    {
      "type": "minecraft:heightmap",
      "heightmap": "OCEAN_FLOOR"
    }
  ]
}