{
    "feature": "tfg:earth/volcano/volcano_smoke",
    "placement": [
        {
            "type": "minecraft:rarity_filter",
            "chance": 40
        },
        {
            "type": "minecraft:in_square"
        },
        {
            "type": "minecraft:heightmap",
            "heightmap": "OCEAN_FLOOR"
        },
        {
            "type": "minecraft:block_predicate_filter",
            "predicate": {
                "type": "tfc:replaceable"
            }
        },
        {
            "type": "minecraft:block_predicate_filter",
            "predicate": {
                "type": "minecraft:matching_block_tag",
                "offset": [ 0, -1, 0 ],
                "tag": "forge:stone"
            }
        }
    ]
}