{
  "format_version": "1.21.20",
  "minecraft:jigsaw": {
    "description": {
      "identifier": "minecraft:trail_ruins"
    },
    "biome_filters": [
      {
        "test": "has_biome_tag",
        "operator": "==",
        "value": "has_structure_trail_ruins"
      }
    ],
    "step": "underground_structures",
    "terrain_adaptation": "bury",
    "start_pool": "minecraft:trail_ruins/tower",
    "max_depth": 7,
    "start_height": -15,
    "heightmap_projection": "world_surface"
  }
}
