Not as much as you'd think! In many places in the yucatan peninsula topsoil is only a few inches deep; it's not rare to see no topsoil at all! The limestone bedrock is exposed to air.
Most mayan ruins have vast sections that are un-execavated, and you can just see the shape of walls/buildings/roads under the plants and foliage.
In the words of Fray Diego de Landa, a spanish bishop (and monster) that was in charge of the church in Yucatan in the 16th century:
Yucatán es una tierra la de menos tierra que yo he visto
("Yucatán is a land with the least amount of land I've ever seen", where in spanish "tierra" means both "land" and "dirt/soil")
Most mayan ruins have vast sections that are un-execavated, and you can just see the shape of walls/buildings/roads under the plants and foliage.
In the words of Fray Diego de Landa, a spanish bishop (and monster) that was in charge of the church in Yucatan in the 16th century:
Yucatán es una tierra la de menos tierra que yo he visto
("Yucatán is a land with the least amount of land I've ever seen", where in spanish "tierra" means both "land" and "dirt/soil")