{
  "feature": "minecraft:basalt_pillar",
  "placement": [
    {
      "type": "minecraft:count",
      "count": 10
    },
    {
      "type": "minecraft:in_square"
    },
    {
      "type": "minecraft:height_range",
      "height": {
        "type": "minecraft:uniform",
        "max_inclusive": {
          "below_top": 0
        },
        "min_inclusive": {
          "above_bottom": 0
        }
      }
    },
    {
      "type": "minecraft:block_predicate_filter",
      "predicate": {
        "type": "minecraft:all_of",
        "predicates": [
          {
            "type": "minecraft:matching_block_tag",
            "tag": "minecraft:air"
          },
          {
            "type": "minecraft:not",
            "predicate": {
              "type": "minecraft:matching_block_tag",
              "offset": [
                0,
                1,
                0
              ],
              "tag": "minecraft:air"
            }
          }
        ]
      }
    },
    {
      "type": "minecraft:biome"
    }
  ]
}