{
  "feature": "unusualprehistory:permafrost_patch",
  "placement": [
    {
      "type": "minecraft:count",
      "count": 2
    },
    {
      "type": "minecraft:in_square"
    },
    {
      "type": "minecraft:height_range",
      "height": {
        "type": "minecraft:uniform",
        "max_inclusive": {
          "absolute": 32
        },
        "min_inclusive": {
          "absolute": -64
        }
      }
    },
    {
      "type": "minecraft:random_offset",
      "xz_spread": 0,
      "y_spread": -1
    },
    {
      "type": "minecraft:block_predicate_filter",
      "predicate": {
        "type": "minecraft:all_of",
        "predicates": [
          {
            "type": "minecraft:any_of",
            "predicates": [
              {
                "type": "minecraft:matching_blocks",
                "blocks": "minecraft:stone"
              },
              {
                "type": "minecraft:matching_blocks",
                "blocks": "minecraft:deepslate"
              }
            ]
          },
          {
            "type": "minecraft:matching_blocks",
            "blocks": "minecraft:water",
            "offset": [
              0,
              1,
              0
            ]
          }
        ]
      }
    },
    {
      "type": "minecraft:biome"
    }
  ]
}