underfoot_rock_units.json

{
    "vector_layers": [
        {
            "id": "rock_units",
            "description": "Geological units",
            "fields": {
                "code": "String",
                "title": "String",
                "description": "String",
                "lithology": "String",
                "lithologies": "Array",
                "rock_type": "String",
                "formation": "String",
                "grouping": "String",
                "span": "String",
                "min_age": "String",
                "max_age": "String",
                "est_age": "String",
                "source": "String"
            },
            "maxzoom": 14,
            "minzoom": 0
        }
    ],
    "attribution": "<a href='http://openstreetmap.org'>OSM contributors</a>"
}